XO-2
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx[1] |
| XO-2S | |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | Script error: No such module "val".[3] |
| XO-2N | |
| Right ascension | Template:RA[4] |
| Declination | Template:DEC[4] |
| Apparent magnitude (V) | Script error: No such module "val".[3] |
| Characteristics | |
| Spectral type | K0V + K0V[3] |
| Astrometry | |
| XO-2S | |
| Radial velocity (Rv) | Script error: No such module "val".[2] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: Script error: No such module "val". mas/yr[2] |
| Parallax (π) | 6.6721±0.0151 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 5.74[5] |
| XO-2N | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[4] Dec.: Script error: No such module "val". mas/yr[4] |
| Parallax (π) | 6.6588±0.0158 mas[4] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 5.74[5] |
| Details[6] | |
| XO-2S | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[7] Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotation | Script error: No such module "val". |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | Script error: No such module "val". Gyr |
| XO-2N | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotation | Script error: No such module "val". |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | Script error: No such module "val". Gyr |
| Other designations | |
| XO-2S: Template:Odlist[8] | |
| XO-2N: Template:Odlist[9] | |
| Database references | |
| SIMBAD | XO-2S |
| XO-2N | |
| Exoplanet Archive | data |
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XO-2 is a binary star system about Script error: No such module "convert". away in the constellation Lynx. It consists of two components, XO-2N and XO-2S, both of which host planetary systems.[10]
Star system
This system is unusual in that the stars are not typically referred to as components A & B, but are designated based on their positions in the sky: XO-2N is the northern star and XO-2S is the southern star.
Both of the stars are slightly cooler than the Sun and are nearly identical to each other. The system has a magnitude of 11 and cannot be seen with the naked eye but is visible through a small telescope. These stars are also notable for their large proper motions.[8][9]
XO-2N and XO-2S have a separation of approximately 4,600 AU.[3]
Planetary systems
There is one confirmed exoplanet orbiting XO-2N. XO-2Nb, which is classified as a hot Jupiter, was discovered by the XO Telescope using the transit method around XO-2N in 2007. It was initially the only known planet in the system and was referred to as XO-2b.[3] A long-period variation in the radial velocity of XO-2N was detected in 2015, which could be explained by either a second planet or a stellar activity cycle. The stellar activity explanation is considered more likely,[6] and is further supported by a 2024 study.[11]
Two planets were reported to orbit around XO-2S in 2014 using the radial velocity method. One of them is Jupiter-mass and another has a mass comparable to Saturn.[10] A 2024 study found evidence for a third, super-Jupiter mass planet around XO-2S.[11]
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See also
Other systems with multiple planet-hosting stars:
Notes
References
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Further reading
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External links
- NASA PlanetQuest: Planet race heats up: 1 month, 32 discoveries
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