HD 210277

HD 210277
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 09m 29.866s[1]
Declination −07° 32′ 55.15″[1]
Apparent magnitude (V) 6.63
Characteristics
Spectral type G0V
U−B color index 0.43
B−V color index 0.773
Astrometry
Radial velocity (Rv)-24.1 km/s
Proper motion (μ) RA: 85.07 ± 0.46[1] mas/yr
Dec.: -449.74 ± 0.30[1] mas/yr
Parallax (π)46.38 ± 0.48[1] mas
Distance70.3 ± 0.7 ly
(21.6 ± 0.2 pc)
Absolute magnitude (MV)4.99
Details
Mass1.09 M☉
Radius1.1 ± 0.05 R☉
Luminosity1.2 L☉
Temperature5532 ± 14 K
Metallicity0.19 ± 0.04
Age6.93 G years
Other designations
NLTT 53073, SAO 145906, BD-08° 5818, Gl 848.4, HIP 109378, GJ 9769, LTT 8887, GCRV 13920, PPM 206033
Database references
SIMBADdata
ARICNSdata
Extrasolar Planets
Encyclopaedia		data

HD 210277 is a 7th magnitude star in the constellation of Aquarius. It is a yellow dwarf star (spectral type G0V) with a mass around 0.92 times that of our Sun.[2] Since its distance is about 70 light years,[1] it is not visible to the unaided eye. With binoculars it is easily visible.

The star has a extrasolar planet that has a minimum mass greater than Jupiters orbiting it in 442 days.[3] Claims were made in 1999 that a dust disk around the star HD 210277, similar to that produced by the Kuiper Belt had been imaged, lying between 30 and 62 AU from the star.[4] However, observations with the Spitzer Space Telescope failed to detect any infrared excess at 70 micrometres or at 24 micrometres wavelengths.[5][6]

Planetary system

The only known planet was discovered using 34 radial velocity measurements taken from 1996 to 1998 at W. M. Keck Observatory.[3]

The HD 210277 planetary system[7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >1.29 ± 0.11 MJ 1.138 ± 0.066 442.19 ± 0.50 0.476 ± 0.017 — —

See also

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ↑ Gonzalez; et al. (1999). "Parent Stars of Extrasolar Planets. IV. 14 Herculis, HD 187123, and HD 210277". The Astrophysical Journal Letters. 511 (2): L111–L114. Bibcode:1999ApJ...511L.111G. doi:10.1086/311847.
  3. 1 2 Marcy, Geoffrey W.; et al. (1999). "Two New Planets in Eccentric Orbits". The Astrophysical Journal. 520 (1): 239–247. arXiv:astro-ph/9904275. Bibcode:1999ApJ...520..239M. doi:10.1086/307451.
  4. ↑ Trilling, D. E.; et al. (2000). "Circumstellar Dust Disks around Stars with Known Planetary Companions". The Astrophysical Journal. 529 (1): 499–505. Bibcode:2000ApJ...529..499T. doi:10.1086/308280.
  5. ↑ Beichman, C. A.; et al. (2005). "Planets and Infrared Excesses: Preliminary Results from a Spitzer MIPS Survey of Solar-Type Stars". The Astrophysical Journal. 622 (2): 1160–1170. arXiv:astro-ph/0412265. Bibcode:2005ApJ...622.1160B. doi:10.1086/428115.
  6. ↑ Bryden, G.; et al. (2009). "Planets and Debris Disks: Results from a Spitzer/MIPS Search for Infrared Excess". The Astrophysical Journal. 705 (2): 1226–1236. Bibcode:2009ApJ...705.1226B. doi:10.1088/0004-637X/705/2/1226.
  7. ↑ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.

Coordinates: 22h 09m 29.8657s, −07° 32′ 55.155″


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