XO-3

XO-3 is a star in the constellation Camelopardalis. The star has a magnitude of 10 and is not visible to the naked eye but is visible through a small telescope.[3] A search for a binary companion star using adaptive optics at the MMT Observatory was negative.[8]

XO-3

Observation data Epoch J2000      Equinox J2000
Constellation	Camelopardalis[1]
Right ascension	04^h 21^m 52.7053^s[2]
Declination	+57° 49′ 01.868″[2]
Apparent magnitude (V)	9.80 ± 0.03[3]
Characteristics
Spectral type	F5V[3]
Apparent magnitude (B)	10.25 ± 0.03[3]
Apparent magnitude (V)	9.80 ± 0.03[3]
Apparent magnitude (J)	9.013 ± 0.029[4]
Apparent magnitude (H)	8.845 ± 0.018[4]
Apparent magnitude (K)	8.791 ± 0.019[4]
Astrometry
Proper motion (μ)	RA: –3.2 ± 0.6[5] mas/yr Dec.: 3.2 ± 0.7[5] mas/yr
Parallax (π)	4.96 ± 0.35[2] mas
Distance	660 ± 50 ly (200 ± 10 pc)
Details
Mass	1.213 ± 0.066[6] M☉
Radius	1.377 ± 0.083[6] R☉
Luminosity	2.92^+0.59 −0.48[6] L☉
Surface gravity (log g)	4.244 ± 0.041[6] cgs
Temperature	6429 ± 100[6] K
Metallicity [Fe/H]	–0.177 ± 0.08[6] dex
Age	2.82^+0.58 −0.82[6] Gyr
Other designations
TYC 3727-1064-1, GSC 03727-01064, 2MASS J04215269+5749018[7]
Database references
SIMBAD	data

Planetary system

In 2007 the gas giant exoplanet XO-3b was discovered by the XO Telescope using the transit method. This object may be classed as brown dwarf because of its high mass.[3]

The XO-3 planetary system[6][9][10]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	11.79 ± 0.59 MJ	0.0454 ± 0.00082	3.1915289 ± 0.0000032	0.2883 ± 0.0025	—	—

See also

• XO Telescope

References

1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
2. Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.Gaia Data Release 1 catalog entry
3. Johns-Krull, Christopher M.; et al. (2008). "XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star". The Astrophysical Journal. 677 (1): 657–670. arXiv:0712.4283. Bibcode:2008ApJ...677..657J. doi:10.1086/528950. S2CID 15342571.
4. Cutri; et al. (2003). "2MASS===04215269+5749018". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-25.
5. Zacharias, N.; et al. (2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal. 145 (2). 44. arXiv:1212.6182. Bibcode:2013AJ....145...44Z. doi:10.1088/0004-6256/145/2/44. S2CID 119299381.Vizier catalog entry
6. Winn, Joshua N.; et al. (2008). "The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b". The Astrophysical Journal. 683 (2): 1076–1084. arXiv:0804.4475. Bibcode:2008ApJ...683.1076W. doi:10.1086/589737. S2CID 119266744.
7. "SIMBAD query result: TYC 3727-1064-1 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2012-02-25.
8. Adams, E. R.; et al. (2013). "Adaptive Optics Images. II. 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets". The Astronomical Journal. 146 (1). 9. arXiv:1305.6548. Bibcode:2013AJ....146....9A. doi:10.1088/0004-6256/146/1/9. S2CID 119117620.
9. Winn, Joshua N.; et al. (2009). "On the Spin-Orbit Misalignment of the XO-3 Exoplanetary System". The Astrophysical Journal. 700 (1): 302–308. arXiv:0902.3461. Bibcode:2009ApJ...700..302W. doi:10.1088/0004-637X/700/1/302. S2CID 2358804.
10. Hirano, Teruyuki; et al. (2011). "Further Observations of the Tilted Planet XO-3: A New Determination of Spin-Orbit Misalignment, and Limits on Differential Rotation". Publications of the Astronomical Society of Japan. 63 (6): L57–L61. arXiv:1108.4493. Bibcode:2011PASJ...63L..57H. doi:10.1093/pasj/63.6.l57. S2CID 16909722.

External links

• "XO-3". Exoplanets. Retrieved 2009-04-28.