Epsilon Monocerotis
Epsilon Monocerotis is a binary star in the constellation Monoceros.
Its location is guide for sky navigation toward Rosette nebula [1]
Epsilon Monocerotis A
 
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 23m 46.08471s[2] |
| Declination | 4° 35′ 34.3153″[2] |
| Apparent magnitude (V) | 4.39[3] |
| Characteristics | |
| Spectral type | A5IV[4] |
| U−B color index | +0.14[5] |
| B−V color index | +0.20[5] |
| Astrometry | |
| Radial velocity (Rv) | +13.10[6] km/s |
| Proper motion (μ) | RA: -22.06[2] mas/yr Dec.: +10.91[2] mas/yr |
| Parallax (π) | 26.67 ± 0.90[2] mas |
| Distance | 122 ± 4 ly (37 ± 1 pc) |
| Absolute magnitude (MV) | 1.52[3] |
| Details | |
| Mass | 2.04[7] M☉ |
| Radius | 2.5[8] R☉ |
| Luminosity | 25[7] L☉ |
| Surface gravity (log g) | 3.95[9] cgs |
| Temperature | 7,923[9] K |
| Metallicity [Fe/H] | -0.11[10] dex |
| Rotational velocity (v sin i) | 149[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The primary is a class A5IV[4] (white subgiant) star in the constellation Monoceros. Its apparent magnitude is 4.39[3] and it is approximately 122 light years away based on parallax.[2] It is reportedly a spectroscopic binary with a period around 331 days.[11]
Epsilon Monocerotis B
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 23m 46.48292s[2] |
| Declination | 4° 35′ 45.2307″[2] |
| Apparent magnitude (V) | 6.72[3] |
| Characteristics | |
| Spectral type | F5V[4] |
| U−B color index | -0.05[12] |
| B−V color index | +0.45[12] |
| Astrometry | |
| Radial velocity (Rv) | +12.40[6] km/s |
| Proper motion (μ) | RA: -21.86[2] mas/yr Dec.: +11.35[2] mas/yr |
| Parallax (π) | 26.95 ± 0.99[2] mas |
| Distance | 121 ± 4 ly (37 ± 1 pc) |
| Absolute magnitude (MV) | 3.88[3] |
| Details | |
| Mass | 1.16[8] M☉ |
| Radius | 1.1[8] R☉ |
| Luminosity | 2.39[3] L☉ |
| Surface gravity (log g) | 3.95[9] cgs |
| Temperature | 7,923[9] K |
| Rotational velocity (v sin i) | 25[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The B component, at a separation of around 12.3",[11] is a class F5V[4] (yellow-white dwarf) star, with an apparent magnitude of 6.72.[3]
References
- ↑ J.Kaler retrieved 20/09/2011
- 1 2 3 4 5 6 7 8 9 10 11 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry A Vizier catalog entry B - 1 2 3 4 5 6 7 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. Vizier catalog entry A Vizier catalog entry B
- 1 2 3 4 5 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
- 1 2 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- 1 2 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 3 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. Vizier catalog entry
- 1 2 3 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. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A.
- 1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146.
- ↑ Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (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.
- 1 2 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (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
- 1 2 Mermilliod, 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
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