Epsilon Monocerotis
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Monoceros |
| ε Mon A | |
| Right ascension | 06h 23m 46.08471s[1] |
| Declination | 4° 35′ 34.3153″[1] |
| Apparent magnitude (V) | 4.39[2] |
| ε Mon B | |
| Right ascension | 06h 23m 46.48292s[3] |
| Declination | 4° 35′ 45.2307″[3] |
| Apparent magnitude (V) | 6.72[4] |
| Characteristics | |
| ε Mon A | |
| Evolutionary stage | main sequence[5] |
| Spectral type | A5 IV[6] |
| U−B color index | +0.14[7] |
| B−V color index | +0.20[7] |
| ε Mon B | |
| Evolutionary stage | main sequence[3] |
| Spectral type | F5 V[6] |
| U−B color index | −0.05[8] |
| B−V color index | +0.45[8] |
| Astrometry | |
| ε Mon A | |
| Radial velocity (Rv) | +13.10[9] km/s |
| Proper motion (μ) | RA: −15.127[1] mas/yr Dec.: +7.701[1] mas/yr |
| Parallax (π) | 24.0777±0.2691 mas[1] |
| Distance | 135 ± 2 ly (41.5 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.52[2] |
| ε Mon B | |
| Radial velocity (Rv) | +12.40[9] km/s |
| Proper motion (μ) | RA: −18.845[3] mas/yr Dec.: +0.658[3] mas/yr |
| Parallax (π) | 25.0633±0.0219 mas[3] |
| Distance | 130.1 ± 0.1 ly (39.90 ± 0.03 pc) |
| Absolute magnitude (MV) | +3.88[4] |
| Details | |
| ε Mon A | |
| Mass | 2.04[5] M☉ |
| Radius | 2.5[10] R☉ |
| Luminosity | 25[5] L☉ |
| Surface gravity (log g) | 3.95[11] cgs |
| Temperature | 7,923[11] K |
| Metallicity [Fe/H] | −0.11[12] dex |
| Rotational velocity (v sin i) | 149[5] km/s |
| ε Mon B | |
| Mass | 1.16[10] M☉ |
| Radius | 1.1[10] R☉ |
| Luminosity | 2.39[4] L☉ |
| Surface gravity (log g) | 3.95[11] cgs |
| Temperature | 7,923[11] K |
| Rotational velocity (v sin i) | 25[6] km/s |
| Other designations | |
| ε Mon, 8 Monocerotis, CCDM J06237+0436, WDS J06238+0436 | |
| ε Mon A: BD+04°1236, FK5 244, GC 8240, HD 44769, HIP 30419, HR 2298, SAO 113810 | |
| ε Mon B: BD+04°1237, FK5 244, GC 8241, HD 44770, HIP 30422, HR 2299, SAO 113811 | |
| Database references | |
| SIMBAD | A |
| B | |
ε Monocerotis, Latinised as Epsilon Monocerotis, is the Bayer designation of a binary star system in the equatorial constellation Monoceros. Its location is a guide for sky navigation toward the Rosette Nebula.[13]
The white-hued primary component has a stellar classification of A5 IV,[6] suggesting it is an aging subgiant star. Its apparent magnitude is 4.39[2] and it is approximately 135 light years away based on parallax. It is reportedly a spectroscopic binary with a period around 331 days.[14]
The B component, at a separation of around 12.3",[14] is a yellow-white hued F-type main-sequence star of class F5 V[6] and an apparent magnitude of 6.72.[4]
References
- 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 3 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 A
- 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 3 4 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
- 1 2 3 4 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. S2CID 55586789. Vizier catalog entry
- 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 (2): 443. Bibcode:2014JAVSO..42..443M.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
- 1 2 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- 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: 555–562. 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. S2CID 33401607.
- ↑ 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. S2CID 53480665.
- ↑ Kaler, James. "EPS MON (Epsilon Monocerotis)". STARS. University of Illinois. Retrieved 2017-12-23.
- 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
