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XO-2 (star)

XO-2
Observation data
Epoch 2000      Equinox 2000
Constellation Lynx
XO-2S
Right ascension 07h 48m 07.4814s
Declination +50° 13′ 03.254″
Apparent magnitude (V) 11.12±0.03
XO-2N
Right ascension 07h 48m 06.468s
Declination +50° 13′ 32.96″
Apparent magnitude (V) 11.18±0.03
Characteristics
Spectral type K0V + K0V
Astrometry
Proper motion (μ) RA: -34.7 ± 2.6 mas/yr
Dec.: -153.6 ± 2.4 mas/yr
Parallax (π) 6.68 ± 0.23 mas
Distance 490 ± 20 ly
(150 ± 5 pc)
Details
XO-2S
Mass 0.982 ± 0.034 M☉
Radius 1.02 R☉
Temperature 5399 ± 55  K
Metallicity [Fe/H] 0.39 ± 0.05 dex
Age 7.1 ± +2.5
−2.9 Gyr
XO-2N
Mass 0.971 ± 0.034 M☉
Radius 0.976+0.024
−0.016 R☉
Temperature 5340 ± 32 K
Age 6.3 ± 2.4 Gyr
Other designations
XO-2S: LSPM J0748+5013S, TYC 3413-210-1, GSC 03413-00210, 2MASS J07480748+5013032
XO-2N: LSPM J0748+5013N, TYC 3413-5-1, GSC 03413-00005, 2MASS J07480647+5013328
Database references
SIMBAD XO-2S
XO-2N

XO-2 Is a binary star. It consists of two components: XO-2S (Also known as XO-2A) and XO-2N (Also known as XO-2B).

This system is located approximately 490 light-years away from Earth in the Lynx constellation. Both of these 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.

XO-2N and XO-2S have a separation of approximately 4,600 AU.

One known exoplanet, XO-2Nb (or rarely XO-2Bb), which is classified as a hot Jupiter, was discovered by the XO Telescope using the transit method orbiting XO-2N (XO-2B) in 2007.

Two planets were reported to orbit around XO-2S in 2014 using radial velocity method. One of them is Jupiter-mass and another has a mass comparable to Saturn.

Both stars also show RV-trends, which may indicate the presence of additional long-periodic jovians or brown dwarfs around each of them.

Coordinates: Sky map07h 48m 06.468s, +50° 13′ 32.96″


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