Epsilon Monocerotis

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Epsilon Monocerotis is a binary star in the constellation Monoceros.

Its location is guide for sky navigation toward Rosette nebula [1]

Epsilon Monocerotis A[edit]

ε Monocerotis A
Monoceros constellation map.svg
Red circle.svg

Location of ε Monocerotis (circled red)
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
8 Monocerotis A, 8 Mon A, BD+04 1236, CCDM J06237+0436A, FK5 244, GC 8240, HIP 30419, HR 2298, HD 44769, SAO 113810, WDS J06238+0436A
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[edit]

ε 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
8 Monocerotis B, 8 Mon B, BD+04 1237, CCDM J06237+0436B, GC 8241, HIP 30422, HR 2299, HD 44770, SAO 113811, WDS J06238+0436B
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[edit]

  1. ^ J.Kaler retrieved 20/09/2011
  2. ^ a b c d e f g h i j k Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry A Vizier catalog entry B
  3. ^ a b c d e f g Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry A Vizier catalog entry B
  4. ^ a b c d e 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. 
  5. ^ a b 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
  6. ^ a b 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. 
  7. ^ a b c Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052Freely accessible. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.  Vizier catalog entry
  8. ^ a b c 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/9911002Freely accessible. Bibcode:1999A&A...352..555A. 
  9. ^ a b c d 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:1501.03154Freely accessible. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. 
  10. ^ Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491Freely accessible. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. 
  11. ^ a b 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
  12. ^ a b 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