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HD 201298

Location of HD 201298 (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Equuleus
Right ascension	21 08 28.1388
Declination	+06° 59′ 21.6948″
Apparent magnitude (V)	6.14
Characteristics
Evolutionary stage	red giant branch?
Spectral type	M0 III
U−B color index	+1.97
B−V color index	+1.66
Astrometry
Radial velocity (Rv)	20 ± 2 km/s
Proper motion (μ)	RA: −10.643 mas/yr Dec.: +2.479 mas/yr
Parallax (π)	2.8646 ± 0.0533 mas
Distance	1,140 ± 20 ly (349 ± 6 pc)
Absolute magnitude (MV)	−1.57
Details
Mass	1.83 M☉
Radius	117 R☉
Luminosity	1,648 L☉
Surface gravity (log g)	0.413 cgs
Temperature	3,732 K
Rotational velocity (v sin i)	4.5 ± 1 km/s
Other designations
12 G. Equueli, AG+06°2888, BD+06°4754, FK5 3692, GC 29548, HD 201298, HIP 104357, HR 8090, SAO 126566
Database references
SIMBAD	data

HD 201298 (HR 8090) is a solitary star located in the northern constellation Equuleus just next to 3 Equulei It has an apparent magnitude of 6.14, making it barely visible to the naked eye under ideal conditions. The star is situated at a distance of 1,140 light years but is drifting away with a heliocentric radial velocity of 20 km/s.

HD 201298 has a stellar classification of M0 III, indicating that it is ageing M-type star that is probably on the red giant branch. As a result, it has expanded to 117 times the Sun's girth. At present it has 1.83 times the mass of the Sun and shines with a luminosity of 1,648 L_☉ from its enlarged photosphere at an effective temperature of 3,732 K, which gives it an orange glow. HD 201298 spins leisurely with a projected rotational velocity of 4.5±1 km/s, slightly faster than most giants.

Note

1. Calculated using this equation: ${\displaystyle M_{\mathrm {V} }=6.14-5\left(\log _{10}349-1\right)=-1.57}$

References

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
2. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 255204555.
3. ^ Gontcharov, G. A. (October 2011). "The red giant branch in the Tycho-2 catalogue". Astronomy Letters. 37 (10): 707–717. arXiv:1607.00557. Bibcode:2011AstL...37..707G. doi:10.1134/S1063773711090040. ISSN 1063-7737. S2CID 119272127.
4. ^ Henry, Gregory W.; Fekel, Francis C.; Henry, Stephen M.; Hall, Douglas S. (September 2000). "Photometric Variability in a Sample of 187 G and K Giants". The Astrophysical Journal Supplement Series. 130 (1): 201–225. Bibcode:2000ApJS..130..201H. doi:10.1086/317346. ISSN 0067-0049.
5. ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
6. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
7. ^ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
8. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711.
9. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
10. ^ de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433–460. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. ISSN 0365-0138.
11. "HD 201298". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 20, 2022.
12. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.

v t e Constellation of Equuleus
Equuleus in Chinese astronomy List of stars in Equuleus
Stars	Bayer α (Kitalpha) β γ δ ε ζ λ Flamsteed 4 6 9 Variable R U SY HR 8038 8067 8090 8095 8149 8191 HD 200779 200964 201585 202908 203473 Other HAT-P-65 WASP-90
Exoplanets MASCARA-1b
Galaxies	NGC 7015 7040 7046
Category

• Equuleus
• M-type giants
• Henry Draper Catalogue objects
• Bright Star Catalogue objects
• Gould objects
• Hipparcos objects
• Durchmusterung objects