M Centauri

Star in the constellation Centaurus

M Centauri
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Centaurus
Right ascension	13^h 46^m 39.378^s^[1]
Declination	−51° 25′ 57.95″^[1]
Apparent magnitude (V)	+4.64
Characteristics
Spectral type	G8-K0III
U−B color index	+0.72
B−V color index	+0.96
Variable type	none
Astrometry

Radial velocity (R_v)	−6 km/s
Proper motion (μ)	RA: 10.00 ± 0.42^[1] mas/yr Dec.: -27.62 ± 0.34^[1] mas/yr
Parallax (π)	12.42 ± 0.48 mas^[1]
Distance	260 ± 10 ly (81 ± 3 pc)
Absolute magnitude (M_V)	+0.16

Orbit^[2]
Primary	M Centauri A
Companion	M Centauri B
Period (P)	437 days
Semi-major axis (a)	6.45 mas
Eccentricity (e)	0.13
Inclination (i)	48.2°
Longitude of the node (Ω)	280.3°
Periastron epoch (T)	2424163.0
Argument of periastron (ω) (secondary)	58.6°
Other designations
HR 5172, HD 119834, CD−50°8017, HIP 67234, SAO 241157, GC 18607, CCDM J13467-5126
Database references
SIMBAD	data

M Centauri (M Cen) is a binary star in the constellation Centaurus. It is approximately 260 light years from Earth.

M Centauri is a yellow G-type giant with an apparent magnitude of +4.64. It is a spectroscopic binary with an orbital period of 437 days.

References

^ ^a ^b ^c ^d ^e 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. Vizier catalog entry
^ Jancart, S. (2005). "Astrometric orbits of S_B⁹ stars". Astronomy and Astrophysics. 442 (1): 365–380. arXiv:astro-ph/0507695. Bibcode:2005A&A...442..365J. doi:10.1051/0004-6361:20053003. S2CID 15123997.

Constellation of Centaurus

Bayer	α A (Rigil Kentaurus) B (Toliman) C (Proxima Centauri) β (Hadar) γ (Muhlifain) δ ε ζ (Alnair) η θ (Menkent) ι κ λ μ ν ξ¹ ξ² ο¹ ο² π ρ σ τ υ¹ υ² φ χ ψ
Flamsteed	1 (i) 2 (g) 3 (k) 4 (h)
Variable	R T U V Y RR SV SX BV DY V346 V744 V752 V761 (a) V763 (C¹) V766 V779 V803 V810 V816 (Przybylski's Star) V831 V842 V885 V886 V863 V945 (H) V1032 V1400
HR	4460 (A) 4466 (C²) 4476 (C³) 4499 4522 4523 4537 (j) 4546 (B) 4620 (E) 4652 (D) 4682 (F) 4712 (x¹) 4721 4724 (x²) 4732 (G) 4748 (u) 4796 4817 (l) 4831 (w) 4874 (p) 4888 (e) 4889 (n) 4940 (f) 4979 4989 5006 (r) 5035 (J) 5041 (m) 5071 (K) 5089 (d) 5141 (Q) 5172 (M) 5174 (z) 5207 (N) 5222 (y) 5224 5241 5297 5358 (v) 5371 5471 (b) 5485 (c¹) 5489 (c²)
HD	97413 98176 100453 101930 102117 (Uklun) 103197 107914 108236 109749 110113 113538 113766 114386 114729 115600 116434 117207 117618 (Dofida) 121228 121504 124448 125072 125595 131399
Other	2MASS J1126−5003 2M1207 Gaia BH2 Gaia BH3 GJ 3737 PSR B1259−63/LS 2883 PSR J1311–3430 WASP-15 (Nyamien) WASP-41 WASP-42 WASP-167/KELT-13

Exoplanets	2M1207b b Centauri b HD 102117 b HD 103197 b HD 109749 b HD 101930 b HD 113538 b c HD 114386 b HD 114729 b HD 117207 b HD 117618 b HD 121504 b HIP 65426 b HIP 67522 b Proxima Centauri b c d WASP-15b

Star clusters	IC 2944 NGC 3766 NGC 4230 NGC 5286 NGC 5281 NGC 5316 NGC 5460 NGC 5617 NGC 5662 ω Scorpius–Centaurus association Stock 16

Nebulae	Boomerang Nebula Fleming 1 G292.0+1.8 IC 2944 NGC 3918 NGC 5307 RCW 79 Southern Crab Nebula SN 185 (RCW 86) SuWt 2

NGC	3783 4444 4603 4622 4650A 4683 4696 4706 4709 4729 4730 4743 4744 4945 4976 5011 A 5026 5090 5091 5102 5114 5128 (Centaurus A) 5161 5253 5291 5398 5408
Other	ESO 269-57 ESO 325-G004 ESO 383-76 ESO 444-46 IRAS 13224-3809 PKS 1144-379 PKS 1353−341