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Gamma Canis Minoris

Gamma Canis Minoris (γ Canis Minoris) is a binary star system in the equatorial constellation Canis Minor. Its orange colour is obvious when seen through binoculars.[7] The system is visible to the naked eye with a combined apparent visual magnitude of +4.33.[2] Based upon an annual parallax shift of 10.25 mas as seen from Earth,[1] this system is located about 320 light years from the Sun.

γ Canis Minoris
Location of γ Canis Minoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Minor
Right ascension 07h 28m 09.79333s[1]
Declination +08° 55′ 31.9068″[1]
Apparent magnitude (V) +4.33[2] (4.46 + 6.66)[2]
Characteristics
Spectral type K3 III Fe-0.5[3] (K4 III + K1: III)[2]
U−B color index +1.53[4]
B−V color index +1.43[4]
Astrometry
Radial velocity (Rv)46.8±0.3[5] km/s
Proper motion (μ) RA: −61.09[1] mas/yr
Dec.: −10.70[1] mas/yr
Parallax (π)10.25 ± 0.47 mas[1]
Distance320 ± 10 ly
(98 ± 4 pc)
Absolute magnitude (MV)−0.5±0.1[2]
Absolute magnitude (MV)1.7±0.2[2]
Orbit[2]
Period (P)389.310 ± 0.012d
Semi-major axis (a)17 mas
Eccentricity (e)0.25856 ± 0.00039
Inclination (i)66°
Periastron epoch (T)2449849.172 ± 0.089 HJD
Argument of periastron (ω)
(secondary)
142.079 ± 0.090°
Semi-amplitude (K1)
(primary)
21.243 ± 0.010 km/s
Semi-amplitude (K2)
(secondary)
21.526 ± 0.017 km/s
Details[2]
γ CMi A
Mass1.88 M
Radius36.8±2.6 R
Luminosity321±33 L
Temperature4,036±100 K
Rotational velocity (v sin i)5±2 km/s
Age1.3 Gyr
γ CMi B
Mass1.85 M
Radius7.8±1.0 R
Luminosity25.4±5.2 L
Temperature4,658±200 K
Rotational velocity (v sin i)2.0±2.0 km/s
Other designations
γ CMi, 4 CMi, BD+09°1660, GC 9974, HD 58972, HIP 36284, HR 2854, SAO 115478, ADS 6100, CCDM 07281+0856, WDS J07282+0856A[6]
Database references
SIMBADdata

This spectroscopic binary star system has an orbital period of 389.31 days, a semimajor axis of 1.48 AU, and an eccentricity of 0.2586.[2] Their variable radial velocity was discovered by H. M. Reese in 1902 at Lick Observatory.[8] Both components are evolved, K-type giant stars, most likely on their first ascent along the red giant branch. The primary, component A, has a stellar classification of K4 III while the secondary, component B, may be K1: III.[2]

References edit

  1. ^ a b c d e f van 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.
  2. ^ a b c d e f g h i j Fekel, F. C.; et al. (March 2013), "The spectroscopic orbit of the K-giant binary γ Canis Minoris", Astronomische Nachrichten, 334 (3): 223, Bibcode:2013AN....334..223F, CiteSeerX 10.1.1.300.8819, doi:10.1002/asna.201211842, S2CID 15851265.
  3. ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. ^ a b Johnson, H. L. (1966), "UBVRIJKL Photometry of the Bright Stars", Communications of the Lunar and Planetary Laboratory, 4: 99, Bibcode:1966CoLPL...4...99J.
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. ^ "gam CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-03.{{cite web}}: CS1 maint: postscript (link)
  7. ^ Kambič, Bojan (2009). Viewing the Constellations with Binoculars: 250+ Wonderful Sky Objects to See and Explore. Springer. p. 32. ISBN 978-0387853543.
  8. ^ Campbell, W. W. (September 1902), "Six stars whose velocities in the line of sight are variable", Astrophysical Journal, 16: 114–117, Bibcode:1902ApJ....16..114C, doi:10.1086/140954, S2CID 123054295.

gamma, canis, minoris, canis, minoris, binary, star, system, equatorial, constellation, canis, minor, orange, colour, obvious, when, seen, through, binoculars, system, visible, naked, with, combined, apparent, visual, magnitude, based, upon, annual, parallax, . Gamma Canis Minoris g Canis Minoris is a binary star system in the equatorial constellation Canis Minor Its orange colour is obvious when seen through binoculars 7 The system is visible to the naked eye with a combined apparent visual magnitude of 4 33 2 Based upon an annual parallax shift of 10 25 mas as seen from Earth 1 this system is located about 320 light years from the Sun g Canis MinorisLocation of g Canis Minoris circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Canis Minor Right ascension 07h 28m 09 79333s 1 Declination 08 55 31 9068 1 Apparent magnitude V 4 33 2 4 46 6 66 2 Characteristics Spectral type K3 III Fe 0 5 3 K4 III K1 III 2 U B color index 1 53 4 B V color index 1 43 4 AstrometryRadial velocity Rv 46 8 0 3 5 km sProper motion m RA 61 09 1 mas yr Dec 10 70 1 mas yrParallax p 10 25 0 47 mas 1 Distance320 10 ly 98 4 pc Absolute magnitude MV 0 5 0 1 2 Absolute magnitude MV 1 7 0 2 2 Orbit 2 Period P 389 310 0 012dSemi major axis a 17 masEccentricity e 0 25856 0 00039Inclination i 66 Periastron epoch T 2449849 172 0 089 HJDArgument of periastron w secondary 142 079 0 090 Semi amplitude K1 primary 21 243 0 010 km sSemi amplitude K2 secondary 21 526 0 017 km s Details 2 g CMi AMass1 88 M Radius36 8 2 6 R Luminosity321 33 L Temperature4 036 100 KRotational velocity v sin i 5 2 km sAge1 3 Gyrg CMi BMass1 85 M Radius7 8 1 0 R Luminosity25 4 5 2 L Temperature4 658 200 KRotational velocity v sin i 2 0 2 0 km s Other designationsg CMi 4 CMi BD 09 1660 GC 9974 HD 58972 HIP 36284 HR 2854 SAO 115478 ADS 6100 CCDM 07281 0856 WDS J07282 0856A 6 Database referencesSIMBADdata This spectroscopic binary star system has an orbital period of 389 31 days a semimajor axis of 1 48 AU and an eccentricity of 0 2586 2 Their variable radial velocity was discovered by H M Reese in 1902 at Lick Observatory 8 Both components are evolved K type giant stars most likely on their first ascent along the red giant branch The primary component A has a stellar classification of K4 III while the secondary component B may be K1 III 2 References edit a b c d e f van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d e f g h i j Fekel F C et al March 2013 The spectroscopic orbit of the K giant binary g Canis Minoris Astronomische Nachrichten 334 3 223 Bibcode 2013AN 334 223F CiteSeerX 10 1 1 300 8819 doi 10 1002 asna 201211842 S2CID 15851265 Keenan Philip C McNeil Raymond C 1989 The Perkins catalog of revised MK types for the cooler stars Astrophysical Journal Supplement Series 71 245 Bibcode 1989ApJS 71 245K doi 10 1086 191373 a b Johnson H L 1966 UBVRIJKL Photometry of the Bright Stars Communications of the Lunar and Planetary Laboratory 4 99 Bibcode 1966CoLPL 4 99J de Bruijne J H J Eilers A C October 2012 Radial velocities for the HIPPARCOS Gaia Hundred Thousand Proper Motion project Astronomy amp Astrophysics 546 14 arXiv 1208 3048 Bibcode 2012A amp A 546A 61D doi 10 1051 0004 6361 201219219 S2CID 59451347 A61 gam CMi SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2017 09 03 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link Kambic Bojan 2009 Viewing the Constellations with Binoculars 250 Wonderful Sky Objects to See and Explore Springer p 32 ISBN 978 0387853543 Campbell W W September 1902 Six stars whose velocities in the line of sight are variable Astrophysical Journal 16 114 117 Bibcode 1902ApJ 16 114C doi 10 1086 140954 S2CID 123054295 Retrieved from https en wikipedia org w index php title Gamma Canis Minoris amp oldid 1170031728, wikipedia, wiki, book, books, library,

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