BD+14 4559

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BD+14°4559
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 21h 13m 35.9901s[1]
Declination +14° 41′ 21.7846″[1]
Apparent magnitude (V) 9.63
Characteristics
Spectral type K2V
B−V color index 1.00
V−R color index 0.56
R−I color index 0.5
Variable type none
Astrometry
Proper motion (μ) RA: 233.993±0.057[1] mas/yr
Dec.: −0.275±0.056[1] mas/yr
Parallax (π)20.2337 ± 0.0345[1] mas
Distance161.2 ± 0.3 ly
(49.42 ± 0.08 pc)
Absolute magnitude (MV)6.14
Absolute bolometric
magnitude (Mbol)		5.56[2]
Details
Mass0.86 ± 0.15 M☉
Radius0.95 ± 0.2 R☉
Luminosity (bolometric)0.4786[2] L☉
Surface gravity (log g)4.60 ± 0.05 cgs
Temperature5008 ± 20 K
Metallicity [Fe/H]0.10 ± 0.07 dex
Age~3 Gyr
Other designations
Solaris, HIP 104780, PPM 139779
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

BD+14 4559, named Solaris,[3] is a 10th magnitude K-type main sequence star located approximately 161 light years away in the constellation of Pegasus. On June 10, 2009, an exoplanet (Pirx) was found in orbit by Niedzielski et al. using the Hobby-Eberly Telescope.[2]

The star BD+14 4559 was named during the NameExoWorlds campaign by Poland. Solaris is the title of a 1961 science fiction novel about an ocean-covered exoplanet by Polish writer Stanislaw Lem.[3]

Stellar characteristics[]

BD+14 4559 is a K-type star that is approximately 86% the mass of and 95% the radius of the Sun. It has a surface temperature of 5008 K and is likely about 3 billion years old based on its characteristics. In comparison, the Sun is about 4.6 billion years old[4] and has a surface temperature of 5778 K.[5]

The star's apparent magnitude, or how bright it appears from Earth's perspective, is 9.63. Therefore, it is too dim to be seen with the naked eye, but can be seen with good binoculars.[citation needed]

Planetary system[]

The BD+14 4559 planetary system[2][6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b >1.52 ± 0.19 MJ 0.777 268.94 ± 0.99 0.29 ± 0.03 >1.769° —
c (unconfirmed) >2.4 MJ >2.3 800? — — —

The star is known to host at least one planet or brown dwarf, Pirx, with a minimum mass of one and a half Jupiter masses (MJ). A 2020 analysis of data from the Gaia mission has set a 3-sigma upper limit to its mass of 49.83 MJ.[6]

Based on observations, there may be an undetected second planet orbiting the star, however this is unconfirmed.[2]

See also[]

References[]

  1. ^ Jump up to: a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Jump up to: a b c d e Niedzielski, A.; et al. (2009). "Substellar-mass Companions to the K-dwarf BD+14 4559 and the K-giants HD 240210 and BD+20 2457". The Astrophysical Journal. 707 (1): 768–777. arXiv:0906.1804. Bibcode:2009ApJ...707..768N. doi:10.1088/0004-637X/707/1/768. S2CID 16877069.
  3. ^ Jump up to: a b "Approved names". NameExoworlds. Retrieved 2020-01-02.
  4. ^ Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
  5. ^ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.
  6. ^ Jump up to: a b Kiefer, F.; Hébrard, G.; Lecavelier Des Etangs, A.; Martioli, E.; Dalal, S.; Vidal-Madjar, A. (2021). "Determining the true mass of radial-velocity exoplanets with Gaia" (PDF). Astronomy & Astrophysics. 645: A7. arXiv:2009.14164. doi:10.1051/0004-6361/202039168. S2CID 221995447.
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