HD 10550

HD 10550

Observation data Epoch J2000      Equinox J2000
Constellation	Cetus
Right ascension	01^h 42^m 43.51077^s[1]
Declination	–03° 41′ 24.7210″[1]
Apparent magnitude (V)	4.98[2]
Characteristics
Spectral type	K2/3 III CN II[3]
B−V color index	1.378±0.003[2]
Astrometry
Radial velocity (Rv)	−33.28±0.15[1] km/s
Proper motion (μ)	RA: −8.989[1] mas/yr Dec.: −33.238[1] mas/yr
Parallax (π)	2.9564 ± 0.1730 mas[1]
Distance	1,100 ± 60 ly (340 ± 20 pc)
Absolute magnitude (MV)	−2.82[2]
Details
Radius	77[4] R☉
Luminosity	2,537.45[2] L☉
Surface gravity (log g)	1.83[5] cgs
Temperature	4,110[5] K
Metallicity [Fe/H]	−0.12[5] dex
Rotational velocity (v sin i)	10[6] km/s
Other designations
BD−04° 260, FK5 1049, HD 10550, HIP 7999, HR 500, SAO 129465[7]
Database references
SIMBAD	data

HD 10550 is a single^[8] star in the equatorial constellation of Cetus. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.98.^[2] Based upon an annual parallax shift of 2.9564 mas,^[1] it is located around 1,100 light years from the Sun. The star is moving closer with a heliocentric radial velocity of −33 km/s.^[1] It has a high peculiar velocity of 72.7+5.7
−4.3 km/s and may be a runaway star.^[9]

The stellar classification of this star is K2/3 III CN II,^[3] showing the spectrum of an evolved K-type giant star with an overabundance of CN in the atmosphere. The measured angular diameter of this star, after correction for limb darkening, is 2.11±0.04 mas.^[10] At the estimated distance of this star, this yields a physical size of about 77 times the radius of the Sun.^[4] The star is radiating around 2,537^[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,110 K.^[5]

References

1. 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.
2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
3. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
4. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3-540-29692-1.. The radius (R_*) is given by:

   ${\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 338\cdot 2.11)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 153\cdot R_{\bigodot }\end{aligned}}}$

5. Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
6. Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
7. "HD 10550". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-12.
8. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
9. Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
10. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039