c Puppis

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c Puppis
NGC 2451 a.jpg
The field of cluster NGC 2451; c Puppis is the brightest star in the frame
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 45m 15.29642s[1]
Declination −37° 58′ 06.8998″[1]
Apparent magnitude (V) 3.61[2]
Spectral type K2.5Ib-IIa(K5IIa) + B9V[3]
Apparent magnitude (U) 7.06[2]
Apparent magnitude (B) 5.34[2]
Apparent magnitude (R) 2.26[2]
Apparent magnitude (I) 1.26[2]
Apparent magnitude (J) 0.68[2]
Apparent magnitude (H) -0.075 ± 0.220[4]
Apparent magnitude (K) -0.47[4]
U−B color index 1.72
B−V color index 1.73
Radial velocity (Rv) 16.83 ± 0.14[5] km/s
Proper motion (μ) RA: -10.18±0.18[1] mas/yr
Dec.: 6.34±0.21[1] mas/yr
Parallax (π) 2.88 ± 0.19[1] mas
Distance 1,130 ± 70 ly
(350 ± 20 pc)
Mass 9.8±2.1/2.8±0.2 M
Radius 202±25/2.4±0.1 R
Luminosity 9600±1700/65±4 L
Temperature A:4000±150/B:10,200 ± 300[6] K
Other designations
CD-37 3863, CPD -37 1558, GSC 07645-03246, HD 63032, HIP 37819, HR 3017, SAO 198398
Database references

c Puppis, also known as HD 63032 and HR 3017, is a spectroscopic binary star[3] in the constellation Puppis. Its apparent magnitude is 3.61.[2] Located around 347 parsecs (1,130 ly) distant, the primary is an orange-red bright giant or supergiant of spectral type K2.5Ib-IIa or K5IIa, [3] while the secondary, discovered in 1983,[6] is a blue main-sequence star of spectral type B9V.[3] The system is the brightest member of the open cluster NGC 2451, over two magnitudes brighter than every other star in the cluster. As the turnoff point of the cluster is currently around B7, the parameters of the system fit with cluster membership.[6]


  1. ^ a b c d e van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e f g Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D. 
  3. ^ a b c d Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878Freely accessible. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  4. ^ a b Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C. 2246: 0. Bibcode:2003yCat.2246....0C. 
  5. ^ Mermilliod, J. C.; Mayor, M.; Udry, S. (2008), "Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters", Astronomy and Astrophysics, 485 (1): 303–314, Bibcode:2008A&A...485..303M, doi:10.1051/0004-6361:200809664 
  6. ^ a b c Groote, D.; Reimers, D. (1983). "Detection of a late B star companion of the bright cluster giant c Pup = HD 63032". Astronomy and Astrophysics. 119 (2): 319–320. Bibcode:1983A&A...119..319G.