35 Pegasi

35 Pegasi is a single[13] star in the northern constellation of Pegasus. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.80.[2] The star is located approximately 155 light years away from the Sun based on parallax,[5] and is drifting further away with a radial velocity of +54 km/s.[4] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.318 arc seconds per annum.[14]

35 Pegasi

Location of 35 Pegasi (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Pegasus
Right ascension	22^h 27^m 51.52233^s[1]
Declination	4° 41′ 44.3916″[1]
Apparent magnitude (V)	4.80[2]
Characteristics
Evolutionary stage	horizontal branch
Spectral type	K0III[3]
U−B color index	+0.88[2]
B−V color index	+1.06[2]
Astrometry
Radial velocity (Rv)	+54.16[4] km/s
Proper motion (μ)	RA: +77.57[5] mas/yr Dec.: −306.12[5] mas/yr
Parallax (π)	21.0039 ± 0.2419[1] mas
Distance	155 ± 2 ly (47.6 ± 0.5 pc)
Absolute magnitude (MV)	1.50[6]
Details
Mass	1.18[6] M☉
Radius	8.5[7] R☉
Luminosity	31.69[8] L☉
Surface gravity (log g)	2.76[9] cgs
Temperature	4,676[9] K
Metallicity [Fe/H]	−0.28[9] dex
Rotational velocity (v sin i)	1.5[10] km/s
Age	4.94[11] Gyr
Other designations
35 Peg, BD+03°4710, FK5 3796, GC 31377, HD 212943, HIP 110882, HR 8551, SAO 127540, CCDM J22278+0441A, WDS J22279+0442A, LTT 16582[12]
Database references
SIMBAD	data

This is an aging giant star[15] with a stellar classification of K0III,[3] having exhausted the hydrogen at its core and expanded to 8.5[7] times the Sun's radius. It is a red clump giant, indicating it is on the horizontal branch and is generating energy through helium fusion at its core.[15] The star is five[11] billion years old with 1.2[6] times the mass of the Sun. It is radiating 32[8] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,676 K.[9]

There are two distant visual companions: component B, at an angular separation of 80.5″ and magnitude 10.0, and C, at separation 176.3″ and magnitude 10.64.[16]

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. Gaia DR2 record for this source at VizieR.
2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
3. Frasca, A.; et al. (December 2009). "REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters". Astronomy and Astrophysics. 508 (3): 1313–1330. arXiv:0911.0760. Bibcode:2009A&A...508.1313F. doi:10.1051/0004-6361/200913327. S2CID 118361131.
4. Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
5. 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. S2CID 18759600. Vizier catalog entry
6. Da Silva, Ronaldo; et al. (2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy & Astrophysics. 580: A24. arXiv:1505.01726. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770. S2CID 119216425. Vizier catalog entry
7. Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
8. 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. Vizier catalog entry
9. Wu, Yue; et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. S2CID 53480665.
10. Massarotti, Alessandro; et al. (January 2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209–231. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
11. Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
12. "35 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-01.
13. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
14. Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal. 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854. S2CID 2603568.
15. Tautvaišienė, G.; et al. (December 2010). "C, N and O abundances in red clump stars of the Milky Way". Monthly Notices of the Royal Astronomical Society. 409 (3): 1213–1219. arXiv:1007.4064. Bibcode:2010MNRAS.409.1213T. doi:10.1111/j.1365-2966.2010.17381.x. S2CID 119182458.
16. Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry