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Binary star system whose component stars are very close
In astronomy, a contact binary is a binary star system whose component stars are so close that they touch each other or have merged to share their gaseous
Contact_binary
Small Solar System body that is composed of two bodies
a bilobated, peanut-like overall shape. Contact binaries are distinct from true binary systems such as binary asteroids where both components are separated
Contact binary (small Solar System body)
Contact_binary_(small_Solar_System_body)
Two astronomical bodies which orbit each other
considered a binary because they are different kinds of objects. Astronomy portal Binary asteroid Binary star Contact binary Contact binary (small Solar
Binary_system
System of two stars orbiting each other
A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars are among
Binary_star
Eclipsing contact binary in Holmberg IX
J095737+690211 is a W Ursae Majoris type eclipsing contact binary star system in the constellation of Ursa Major. The binary system is located in the dwarf galaxy
Holmberg_IX_V1
Common gas atmosphere of a binary star system
envelope binary Binary star Binary system (astronomy) Contact binary Post-common-envelope binary Paczyński, B. (1976). "Common Envelope Binaries". In Eggleton
Common_envelope
Topics referred to by the same term
theory Binary system (astronomy), a system of two celestial bodies on a mutual orbit Binary asteroid Binary star Contact binary Contact binary (asteroid)
Binary system (disambiguation)
Binary_system_(disambiguation)
System of two asteroids orbiting their common center of mass
A binary asteroid is a system of two asteroids orbiting their common barycenter. The binary nature of 243 Ida was discovered when the Galileo spacecraft
Binary_asteroid
2025). "The Geology of a Small Main-belt S-class Binary Asteroid System: Dinkinesh and Its Contact Binary Satellite Selam as Observed by the Lucy Mission"
List of Solar System objects by size
List_of_Solar_System_objects_by_size
Moon of asteroid 152830 Dinkinesh
Selam (formal designation Dinkinesh I) is a contact binary moon of 152830 Dinkinesh, a main belt asteroid. It was discovered by NASA's Lucy spacecraft
Selam_(moon)
Coming together of two stars
same atmosphere, giving the system a peanut shape. While most such contact binary systems are stable, some do become unstable and either eject one partner
Stellar_collision
Classical Kuiper belt object
Kitt Peak's 4 m telescope. Occultations suggest it is a compact or contact binary equivalent to a sphere 400 to 500 km in diameter. On 20 November 2020
19521_Chaos
Largest Jupiter trojan
9×1018 kg (thus density of 1.0g/cm3). It is thought that Hektor might be a contact binary (two asteroids joined by gravitational attraction) like 216 Kleopatra
624_Hektor
Contact binary star system in the constellation Dorado
VFTS 352 is a contact binary star system about 160,000 light years away in the Tarantula Nebula, which is part of the Large Magellanic Cloud. It is the
VFTS_352
Stellar explosion with a distinct red colour
V1309 Scorpii is a luminous red nova that followed the merger of a contact binary in 2008. In January 2015, a luminous red nova was observed in the Andromeda
Luminous_red_nova
Number expressed in the base-2 numeral system
A binary number is a number expressed in the base-2 numeral system or binary numeral system, a method for representing numbers that uses only two symbols
Binary_number
Satellite that orbits a natural satellite
irregular satellite Kiviuq is extremely prolate, and is likely a contact binary or even a binary moon. Other candidates among the Saturnian irregulars include
Subsatellite
Main belt asteroid target of the Lucy mission
During the flyby, the Lucy spacecraft discovered that Dinkinesh has a contact-binary natural satellite, named Selam, which is 220 meters (720 ft) in diameter
152830_Dinkinesh
Natural physical entity in space
and nebulae, and many astronomers were able to determine the masses of binary stars based on their orbital elements. Computers began to be used to observe
Astronomical_object
Kuiper belt object
find Kuiper belt objects that New Horizons could visit. Arrokoth is a contact binary—a "snowman"-shaped object composed of two lobes connected by a narrow
486958_Arrokoth
NASA mission to fly by eight asteroids
showed that the satellite was actually two objects in direct contact, known as a contact binary. The discovery of Dinkinesh's satellite brought the total
Lucy_(spacecraft)
Asteroid
Pan (prov. designation: 1987 SY) is a highly eccentric asteroid and contact binary, classified as a potentially hazardous asteroid and near-Earth object
4450_Pan
Near-Earth asteroid
11066 Sigurd (provisional designation 1992 CC1) is a stony contact binary asteroid classified as near-Earth object of the Apollo group of asteroids, approximately
11066_Sigurd
Periodic contact binary comet
of a gentle, low-velocity collision of two objects, and is called a contact binary. The "terraces", layers of the interior of the comet that have been
67P/Churyumov–Gerasimenko
Triple system of Kuiper belt objects
the orbit of its inner binary evolved by tides and became a contact binary. 58534 Logos is also thought to be a contact binary triple system. Hiisi, formally
47171_Lempo
Star in the constellation Scorpius
V1309 Scorpii (also known as V1309 Sco) is a contact binary that merged into a single star in 2008 in a process known as a luminous red nova. It was the
V1309_Scorpii
Irregular galaxy in the Local Group
JWST's NIRCam. Credit: NASA, ESA, CSA WLM-CB1 is a massive candidate contact binary system identified in 2024 through archival time-series photometric observations
Wolf–Lundmark–Melotte
M-type asteroid
Kleopatra is a contact binary – if it were spinning much faster, the two lobes would separate from each other, making a true binary system. List of exceptional
216_Kleopatra
Near-Earth asteroid
was observed by the Goldstone Solar System Radar and found to be a contact binary with the largest axis approximately 2 kilometers wide, and each lobe
(85989)_1999_JD6
Solid objects in protoplanetary disks and debris disks
formed. The most primitive planetesimals visited by spacecraft are the contact binary Arrokoth. The word planetesimal is derived from the word infinitesimal
Planetesimal
Binary Kuiper belt object
Logos, or as a binary system (58534) Logos–Zoe (provisional designation 1997 CQ29), is a likely trans-Neptunian contact binary or close-binary triple system
58534_Logos
Contact binary which resulted in one star
(also known as PSN J14021678+5426205, iPTF13afz and AT 2015dl) is a contact binary that merged into a single star, in a process known as a luminous red
M101_OT2015-1
Triple star system in the constellation Boötes
and 44 Boötis Bb. 44 Boötis B is a contact binary of the W Ursae Majoris type. It is the nearest contact binary star. 44 Boötis is the star's Flamsteed
44_Boötis
Near-Earth asteroid
April 1996 by astronomer Tom Gehrels at Steward Observatory. It is a contact binary asteroid, with two lobes separated by a distinct "neck"; altogether
(8567)_1996_HW1
Binary Kuiper belt object
Chile. A study of Manwë's light curve in 2019 suggests that it may be a contact binary object. Manwë was discovered on 25 August 2003 by M. W. Buie at Cerro
385446_Manwë
Star in the constellation Ursa Major
close together that their outer envelopes are in direct contact, making them a contact binary system. As a result, they have the same stellar classification
W_Ursae_Majoris
Asteroid
Since then radar observations of other asteroids have found other contact binaries. Castalia is a potentially hazardous asteroid (PHA) because its minimum
4769_Castalia
Process where a red giant star engulfs a planet
including Mercury, Venus and possibly Earth. Common envelope Contact binary Interacting binary star Neutron star merger Stellar collision Leary, Ashlyn R
Stellar_engulfment
Double stars that show a significant interaction between their components
An Interacting binary star is a type of binary star in which one or both of the component stars has filled or exceeded its Roche lobe, also known as a
Interacting_binary_star
1984 novel by Robert L. Forward
light-years (ca. 34 trillion miles; ca. 56 trillion km) to explore a contact binary planet that orbits Barnard's Star, which they call Rocheworld, and where
Rocheworld
Meteorological phenomenon involving two cyclones circling each other
Fujiwhara effect, sometimes referred to as the Fujiwhara interaction or binary interaction, is a phenomenon that occurs when two nearby cyclonic vortices
Fujiwhara_effect
Near-Earth object of the Apollo group
object of the Apollo group, approximately 1 kilometer in diameter. The contact binary was discovered on 24 April 1977, by American astronomer Charles Kowal
2063_Bacchus
Type of variable stellar binary
variable, also known as a low mass contact binary, is a type of eclipsing binary variable star. These stars are close binaries of spectral types F, G, or K
W_Ursae_Majoris_variable
Eccentric asteroid and suspected contact-binary
(prov. designation: 1987 SB), is an eccentric asteroid and suspected contact-binary, classified as near-Earth object and potentially hazardous asteroid
4486_Mithra
Florian asteroid
provisional designation 1942 EM, is a stony Florian asteroid and suspected contact binary from the inner asteroid belt, approximately 4.5 kilometers in diameter
5535_Annefrank
Contact binary star system
is a contact binary star system in the constellation Cygnus, located about 2,060 light-years away. It is also identified as an eclipsing binary with an
KIC_9832227
Star in the constellation Centaurus
distance of 410 light-years (125.6 parsecs) from Earth. V752 Centauri is a contact binary of the W Ursae Majoris type, composed of two F-type stars with a combined
V752_Centauri
Trans-Neptunian object in the Haumea family
85, which indicates that it has an extremely elongated shape or is a contact binary. In the former case the density of 2003 SQ317 is estimated at 0.86 g/cm3
(612620)_2003_SQ317
Star in the constellation Centaurus
observing conditions. A 2014 publication hypothesized the star to be a contact binary, sharing a common envelope of material with a smaller yellow supergiant
HR_5171
Asteroid
(600 mi) from the surface on 20 April 2025, revealing the asteroid to be a contact binary. It was named after American paleoanthropologist Donald Johanson, the
52246_Donaldjohanson
Constellation in the northern sky
meaning "three steps". W Ursae Majoris is the prototype of a class of contact binary variable stars, and ranges between magnitudes 7.75 and 8.48. 47 Ursae
Ursa_Major
Kreutz sungrazer comet
5681. Z. Sekanina (2021). "New Model for the Kreutz Sungrazer System: Contact-Binary Parent and Upgraded Classification of Discrete Fragment Populations"
C/2026_A1_(MAPS)
Trans-Neptunian object
to 0.7 in 2010. This large amplitude implies that it is actually a contact binary consisting of two elongated components of approximately equal size viewed
(139775)_2001_QG298
Star system in the Ursa Major
the lowest-mass contact binary ever discovered in the universe. The two inner components form a close W Ursae Majoris-type contact binary system. The primary
TYC_3801-1529-1
Binary Kuiper belt object
Altjira (provisional designation 2001 UQ18) appears to be a triple or contact binary double classical Kuiper belt object. The secondary is large compared
148780_Altjira
interferometry. Other methods can use lunar occultations or from eclipsing binaries, which can be used to test indirect methods of finding stellar radii. Only
List_of_largest_stars
flybys Smallest main-belt asteroid visited to date; discovered first contact binary satellite Selam 52246 Donaldjohanson 3.9 March 2, 1981 Lucy 2025 960
List_of_exceptional_asteroids
Moon of Saturn
Kiviuq suggests that it has an elongated shape, and may be a possible contact binary. On 30 August 2010, the ISS camera of the Cassini–Huygens spacecraft
Kiviuq_(moon)
Constellation in the Southern Celestial Hemisphere
is not taking place as expected. SX Corvi is an eclipsing binary that is also a contact binary known as a W Ursae Majoris variable. The two component stars
Corvus_(constellation)
Star in the constellation Phoenix
distance of 168 light-years (51.4 parsecs) from Earth. AE Phoenicis is a contact binary of W Ursae Majoris type, composed of two stars so close that their surfaces
AE_Phoenicis
Sub-kilometer asteroid
Experimental Test Site near Socorro, New Mexico, in the United States. It is a contact binary. The orbit of this potentially hazardous asteroid (PHA) has been well-established
(153201)_2000_WO107
Binary star in the constellation Canis Minor
abbreviated YY CMi and otherwise referred to as HD 67110, is an eclipsing contact binary in the constellation of Canis Minor, close to the border with Hydra
YY_Canis_Minoris
Star in the constellation Centaurus
distant from the Solar System. The system is a contact binary of the W UMa type - two stars in physical contact whose two components share a gaseous envelope
RR_Centauri
Main-belt asteroid
which they interpreted as indicating the asteroid may actually be a contact binary. In 2003, Tanga et al. published results obtained from the Fine Guidance
44_Nysa
Variable star in the constellation Sextans
arcseconds. The brighter component is a W Ursae Majoris variable eclipsing contact binary star system, whose two component stars share a common outer layer. Because
Y_Sextantis
Image comprising exactly two colors, typically black and white
A binary image is a digital image that consists of pixels that can have one of exactly two colors, usually black and white. Each pixel is stored as a single
Binary_image
Periodic comet
Comet Tuttle in January 2008 by the Arecibo Observatory show it to be a contact binary. The comet nucleus is estimated at 4.5 km (2.8 mi) in diameter, using
8P/Tuttle
Near-Earth asteroid discovered in 2014
near-Earth objects since 1908 (A) v t e 2014 JO25 is a peanut-shaped contact binary asteroid. It is an assumed to be a stony S-type asteroid. The overall
(671294)_2014_JO25
Near-Earth asteroid
Observations from Arecibo Observatory were taken on 1–4 February. It is a contact binary asteroid. Asteroid 2004 XP14 was the closest potentially hazardous asteroid
2007_TU24
Inclined contact-binary asteroid
3752 Camillo is an inclined contact-binary asteroid, classified as near-Earth object of the Apollo group, approximately 2.3 kilometers (1.4 miles) in diameter
3752_Camillo
1993 novel by Arthur C. Clarke
Tunguska event and the Cretaceous–Paleogene extinction event. A new contact binary asteroid is discovered by an amateur astronomer, Dr. Angus Millar, having
The Hammer of God (Clarke novel)
The_Hammer_of_God_(Clarke_novel)
Moon of Saturn
variations in brightness, making it a leading candidate for a contact binary or binary moon. The moon was named in April 2007 after Béibhinn (Béḃinn)
Bebhionn_(moon)
Electromechanical device
that each possible position of the axle creates a unique binary code in which some of the contacts are connected to the current source (i.e. switched on)
Rotary_encoder
Astronomical body that orbits a planet
irregular satellite Kiviuq is extremely prolate, and is likely a contact binary or even a binary moon. Neptune's moon Proteus is the largest irregularly shaped
Natural_satellite
Asteroid
Laboratory's Experimental Test Site near Socorro, New Mexico. 1999 JV6 is a contact binary object consisting of two distinct lobes, as seen in radar images from
(85990)_1999_JV6
Star in the constellation Centaurus
its variable star designation, SV Centauri, in 1907. SV Centauri is a contact binary made of two hot B-type stars with spectral types of B1V and B6.5III
SV_Centauri
Variable star in the constellation Ursa Major
and S. M. Rucinski called into question the assumption that this is a contact binary system, suggesting instead that the pair share a luminous equatorial
AW_Ursae_Majoris
Relationship between elements of two sets
In mathematics, a binary relation associates some elements of one set called the domain with some elements of another set (possibly the same) called the
Binary_relation
Potentially hazardous near-Earth asteroid in the Apollo group
mission confirmed these findings and also suggested that Itokawa may be a contact binary formed by two or more smaller asteroids that have gravitated toward
25143_Itokawa
Constellation in the southern celestial hemisphere
stars are thought to have formed with the merger of two stars in a contact binary system. With an apparent magnitude of 8.05, it is 707 ± 6 light-years
Mensa_(constellation)
Financial exotic option with an all-or-nothing payoff
binary option is a financial exotic option in which the payoff is either some fixed monetary amount or nothing at all. The two main types of binary options
Binary_option
Eclipsing binary star in the constellation Virgo
produced a model for the light curve which suggested this is instead a contact binary. Multiple observers noted a permanent asymmetry to the light curve,
AG_Virginis
Binary star in the Galactic Center in the constellation Sagittarius
GCIRS 16SW, also known as S97, is a contact binary star located in the Galactic Center. It is composed of two hot massive stars of equal size that orbit
GCIRS_16SW
Collapsed core of a massive star
stars in a close binary system is observed to shrink as gravitational waves are emitted. Ultimately, the neutron stars will come into contact and coalesce
Neutron_star
Large self-illuminated object in space
stars in a binary system are close enough, some of that material may overflow to the other star, yielding phenomena including contact binaries, common-envelope
Star
running FastContact online or downloading the binary was set up by P. Christoph Champ in July 2005. Camacho CJ, Zhang C (2005). "FastContact: rapid estimate
FastContact
American scientist
shape, which is two distinct 0.9 km lobes in contact (a contact binary). 4179 Toutatis – a contact binary asteroid that is in a non-principal axis rotation
Steven_J._Ostro
Triple star system
system in the equatorial constellation of Taurus that includes a contact eclipsing binary. The system is too faint to be viewed with the naked eye, having
EQ_Tauri
Sub-kilometer sized peanut-shaped asteroid
object and potentially hazardous asteroid of the Apollo group. This contact binary was discovered on 23 February 2006, by astronomers of the LINEAR program
(388188)_2006_DP14
Solar system objects beyond Neptune
perihelion of 80 AU from the Sun (50 AU beyond Neptune). 486958 Arrokoth A contact binary classical KBO encountered by the New Horizons spacecraft in 2019. 2018
Trans-Neptunian_object
Binary star in the Andromeda constellation
Ursae Majoris variable stars, so the two stars in this system form a contact binary. The observed spectral type of both stars in this system is G5, and
AB_Andromedae
Constellation in the northern celestial hemisphere
representative of a very brief phase in which the system is transitioning into a contact binary. It can be found less than a degree away from the naked-eye star 16
Lyra
images of the main belt asteroid Donaldjohanson, revealing it to be a contact binary and larger than originally estimated. 22 April – Astronomers at MIT
2025_in_science
Star in the constellation Centaurus
of co-moving stars. The magnitude 5.3 primary component forms a near-contact binary system, with the components designated Aa and Ab. It has a combined
V831_Centauri
Moon of Saturn
two maxima and two minima in its light curve, it may therefore be a contact binary, although this is less likely than for Kiviuq and Bestla. The surface
Thrymr_(moon)
Largest moon of Neptune
(2004). "Extreme Kuiper Belt Object 2001 QG298 and the Fraction of Contact Binaries". The Astronomical Journal. 127 (5): 3023–3033. arXiv:astro-ph/0402277
Triton_(moon)
Near-Earth asteroid
between 270 and 590 meters in diameter. Radar astronomy shows it is a contact binary asteroid with a diameter of 300 meters and a rotation period of 9.5
(179806)_2002_TD66
Type of variable stellar binary
variable D = detached binary DSCTC = Delta Scuti variable GS = at least one giant or supergiant component KE = contact binary RS = RS Canum Venaticorum
Beta_Lyrae_variable
350m near-Earth object
Mauna Kea on 27 July 2024. Radar observations showed that 2024 ON is a contact binary. 2024 MK – a near-Earth object that made a close approach on 29 June
2024_ON
Former radio telescope in Puerto Rico, United States
of delay–Doppler images showing two lobes in contact, providing the first observation of a contact binary. The following year, Polish astronomer Aleksander
Arecibo_Telescope
CONTACT BINARY
CONTACT BINARY
Surname or Lastname
English
English : from an Old Breton personal name, derived from an element meaning ‘high’, ‘mighty’, which was introduced into England by followers of William the Conqueror and subsequently into Ireland, where it still has some currency as a personal name.Scottish : habitational name from a place in Kincardineshire. The place name is of uncertain origin, possibly from an early Celtic name, Conona ‘hound stream’.Roger Conant led a secession from Plymouth colony in about 1627 and founded the settlement that became Salem, MA. He was probably the son of Christopher Connant, who came over from England aboard the Anne in 1623.
Boy/Male
Tamil
Nityagopal | நிதà¯à®¯à®•à¯‹à®ªà®¾à®²Â
Constant
Nityagopal | நிதà¯à®¯à®•à¯‹à®ªà®¾à®²Â
Boy/Male
Irish
Brave or wise.
Surname or Lastname
Irish (Connacht)
Irish (Connacht) : reduced Anglicized form of Gaelic Ó LáimhÃn, a reduced form of Ó FlaithimhÃn ‘descendant of FlaithimhÃn’, a personal name from a diminutive of flaith ‘prince’, ‘ruler’. This name is sometimes translated Hand, from the similarity of the reduced form to lámh ‘hand’.English : from the medieval female personal name Lavin(a) (from Latin Lavinia, of unknown origin)Spanish (LavÃn) : habitational name from Lavin, a place so named in the Santander province.Respelling of French Lavigne.
Girl/Female
Arabic
Sensible Contact
Girl/Female
Tamil
Constant
Boy/Male
Australian, British, English, French, Russian
Eye Contact; Clean Sight
Boy/Male
English Latin
Steady; stable.
Boy/Male
Indian
Constant
Girl/Female
Tamil
Content
Boy/Male
Tamil
Constant
Surname or Lastname
French and English
French and English : from a medieval personal name (Latin Constans, genitive Constantis, meaning ‘steadfast’, ‘faithful’, present participle of the verb constare ‘stand fast’, ‘be consistent’). This was borne by an 8th-century Irish martyr. This surname has also absorbed some cases of surnames based on Constantius, a derivative of Constans, borne by a 2nd-century martyr, bishop of Perugia. Compare Constantine.English : perhaps also a nickname from Old French constant ‘steadfast’, ‘faithful’.
Boy/Male
Tamil
Content
Girl/Female
Irish
Constant.
Girl/Female
Indian
Constant
Boy/Male
Australian, Celtic, Irish
Wise; Hound; Wolf; High
Boy/Male
Australian, Irish
Brave; Wise
Boy/Male
Celtic Irish
Wise.
Girl/Female
Spanish Italian
Constant.
Girl/Female
Irish
Constant.
CONTACT BINARY
CONTACT BINARY
Girl/Female
Tamil
Female
Egyptian
, a daughter of Rameses II; & a wife of Rameses II.
Boy/Male
Indian, Punjabi, Sikh
Victory of God
Girl/Female
Hindu, Indian
Golden Hills
Boy/Male
Sikh
Original God
Boy/Male
Indian, Punjabi, Sikh
Conqueror of Enemies
Girl/Female
Indian
Garden, Gulshan
Boy/Male
Tamil
One of the Pandavas princes
Girl/Female
Tamil
Soubarna | ஸௌபரநாÂ
Girl with a golden' href='Girl-Names-for-Meaning-golden.aspx'>golden complexion, Color of gold
Boy/Male
Australian, Latin
Magic Majestic; Dignity; Venerable; Worthy of Respect; From Augustus
CONTACT BINARY
CONTACT BINARY
CONTACT BINARY
CONTACT BINARY
CONTACT BINARY
n.
To lead, as a commander; to direct; to manage; to carry on; as, to conduct the affairs of a kingdom.
n.
To draw together or nearer; to reduce to a less compass; to shorten, narrow, or lessen; as, to contract one's sphere of action.
n.
One who keeps a constant watch of the conduct of others.
v. i.
To conduct one's self; to behave.
p. p. & a
Brief; close; pithy; not diffuse; not verbose; as, a compact discourse.
v. t.
To unite or connect firmly, as in a system.
n.
To bring on; to incur; to acquire; as, to contract a habit; to contract a debt; to contract a disease.
n.
The agreement of two or more persons, upon a sufficient consideration or cause, to do, or to abstain from doing, some act; an agreement in which a party undertakes to do, or not to do, a particular thing; a formal bargain; a compact; an interchange of legal rights.
v. t.
To prepare from crude materials, as food; to invent or prepare by combining different ingredients; as, to concoct a new dish or beverage.
n.
A close union or junction of bodies; a touching or meeting.
v. i.
To be drawn together so as to be diminished in size or extent; to shrink; to be reduced in compass or in duration; as, iron contracts in cooling; a rope contracts when wet.
v. t.
To conduct safely; to give safe-conduct to.
v. t.
To set in opposition, or over against, in order to show the differences between, or the comparative excellences and defects of; to compare by difference or contrariety of qualities; as, to contrast the present with the past.
n.
An agreement between parties; a covenant or contract.
a.
Contracted; as, a contract verb.
n.
An expression of assent to a bill or motion; an affirmative vote; also, a member who votes "Content.".
v. i.
To join, unite, or cohere; to have a close relation; as, one line of railroad connects with another; one argument connect with another.
n.
The property of two curves, or surfaces, which meet, and at the point of meeting have a common direction.
v. i.
To make an agreement; to covenant; to agree; to bargain; as, to contract for carrying the mail.
n.
The plane between two adjacent bodies of dissimilar rock.