A visual band light curve for V645 Monocerotis, adapted from Stift (1979)[1]
Observation data Epoch J2000 Equinox J2000
Constellation
Monoceros
Right ascension
08h 01m 13.33574s[2]
Declination
−01° 23′ 33.3935″[2]
Apparent magnitude (V)
4.69[3]
Characteristics
Spectral type
K4III[4]
U−B color index
+1.76[5]
B−V color index
+1.49[5]
Astrometry
Radial velocity (Rv)
+26.70[6] km/s
Proper motion (μ)
RA: +67.60[2] mas/yr Dec.: −76.26[2] mas/yr
Parallax (π)
7.25 ± 0.30 mas[2]
Distance
450 ± 20 ly (138 ± 6 pc)
Absolute magnitude (MV)
−1.00[3]
Details
Mass
2.193±0.110[7]M☉
Radius
47.69+0.46 −2.21[8]R☉
Luminosity
524±42[8]L☉
Surface gravity (log g)
1.68[9] cgs
Temperature
3,999+96 −19[8] K
Metallicity [Fe/H]
−0.26[3] dex
Rotational velocity (v sin i)
2.2[10] km/s
Other designations
V645 Mon, BD−00 1882, FK5 2620, GC 10870, HD 65953, HIP 39211, HR 3141, SAO 135380[11]
Database references
SIMBAD
data
28 Monocerotis is a single[12] star in the equatorial constellation of Monoceros. It has an orange-hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.69.[3] The distance to this star is approximately 450 light years based on parallax,[2] and it has an absolute magnitude of −1.00.[3] The star is drifting further away from the Sun with a radial velocity of +26.7 km/s.[6]
This is an aging giant star with a stellar classification of K4III,[4] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. The spectrum of the star shows abnormally strong lines of CN.[13] It is classified as an FK Comae Berenices variable, varying by 0.02 magnitude over a period of 0.21 days.[14][1] FK Comae Berenices variables are typically rapidly-rotating stars, but the measured projected rotational velocity of 28 Monocerotis is low.[10] The star has expanded to 48 times the radius of the Sun. It is radiating 524 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,999 K.[8]
Measurement of the star's proper motion anomaly by the Gaia spacecraft suggests a companion may be orbiting the star at a distance of 1.9 AU.[7]
^ abCite error: The named reference Stift1979 was invoked but never defined (see the help page).
^ abcdefVan 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
^ abCite error: The named reference Houk1999 was invoked but never defined (see the help page).
^ abMermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
^ abGontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ abCite error: The named reference Kervella2019 was invoked but never defined (see the help page).
^ abcdCite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
28Monocerotis is a single star in the equatorial constellation of Monoceros. It has an orange-hue and is faintly visible to the naked eye with an apparent...
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limit of visibility to the naked eye. The star is located at a distance of 28.5 light years from the Sun based on parallax, but is drifting closer with...
the constellation of Monoceros, less than a degree to the ESE of Delta Monocerotis. It is informally known as the Butterfly Nebula. The nebula is bright...
constellation Hydra with an apparent magnitude is 4.64. It was catalogued as 31 Monocerotis, but this name is now rarely used since the star is now within the boundaries...
KH 15D (V582 Monocerotis), described as a winking star because of its unusual dips in brightness, is a binary T Tauri star system embedded in a circumbinary...
constraints, in addition to the seismic ones, to stellar modeling. AU Monocerotis: This semi-detached binary system contains a Be star interacting with...
Collins English Dictionary. Archived from the original on 28 November 2012. Retrieved 28 November 2012. Serpens may be divided into Serpens Cauda (serpent's...
O3.5 have subsequently been introduced. Spectral standards: O7V – S Monocerotis O9V – 10 Lacertae B-type stars are very luminous and blue. Their spectra...
Bob) (August 28, 2011). "Comet Elenin tired of doomsday finger pointing". Archived from the original on September 15, 2011. Retrieved August 28, 2011. Ernesto...
Frankowski, Adam; Joshi, Vishal; Menten, Karl M. (1 November 2021). "V838 Monocerotis as seen by ALMA: A remnant of a binary merger in a triple system". Astronomy...
616A..37B. doi:10.1051/0004-6361/201833456. S2CID 56269929. Hall, Shannon (28 May 2018). "Known Close Stellar Encounters Surge in Number". Sky and Telescope...
Bibcode:2001ApJ...554L.201H. doi:10.1086/321707. S2CID 17956137. "V582 Monocerotis". The International Variable Star Index. American Association of Variable...
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first described by William Herschel. Herschel's Wonder Star is Beta Monocerotis. Hind's Crimson Star is R Leporis, a long-period variable star, named...
"Rotation Statistics of Algol-Type Binaries and Results on RY Geminorum, RW Monocerotis, and RW Tauri", Astronomical Journal, 100: 1981, Bibcode:1990AJ....100...
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