V Puppis (V Pup) is a star system in the constellation Puppis. Its apparent magnitude is 4.41.[2] There is a binary star system at the center with a B1 dwarf orbiting a B3 subgiant star.[4] They have an orbital period of 1.45 days and a distance of only 15 solar radii apart.[3] However, the system moves back and forth, indicating that there is a massive object orbiting them with a period around 5.47 years. Based on the mass of the object, its lack of a visible spectrum, and circumstellar matter in the system with many heavy elements (as would be produced by a past supernova in the system), it is probably a black hole.[9][10]

V Puppis

Location of V Puppis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Puppis
Right ascension	07h 58m 14.43920s[1]
Declination	−49° 14′ 41.6803″[1]
Apparent magnitude (V)	4.41[2] (5.10 + 5.59)[3]
Characteristics
Spectral type	B1Vp + B3IV:[4]
U−B color index	−0.96[2]
B−V color index	−0.17[2]
Variable type	β Lyr[5]
Astrometry
Radial velocity (Rv)	+19.40[6] km/s
Proper motion (μ)	RA: -5.34[1] mas/yr Dec.: +7.12[1] mas/yr
Parallax (π)	3.40 ± 0.29 mas[1]
Distance	960 ± 80 ly (290 ± 30 pc)
Absolute magnitude (MV)	−3.56[7]
Orbit[3]
Primary	V Pup Aa
Companion	V Pup Ab
Period (P)	1.4544859 d
Semi-major axis (a)	14.96±0.2 R☉
Details
V Pup Aa
Mass	14.0[3] M☉
Radius	5.48[3] R☉
Luminosity	12,600[3] L☉
Temperature	26,000[3] K
Rotational velocity (v sin i)	275.0[8] km/s
V Pup Ab
Mass	7.3[3] M☉
Radius	4.59[3] R☉
Luminosity	6,500[3] L☉
Temperature	24,000[3] K
Age	5[3] Myr
Other designations
CD-48°3349, CCDM J07582-4915A, GC 10802, GSC 08143-03239, HIP 38957, HR 3129, HD 65818, SAO 219226, WDS J07582-4915A
Database references
SIMBAD	data

In addition to the main system, more distant components have been reported: B, at magnitude 11.5 and separation 6.2", C, at magnitude 13.2 and separation 18.9", D, at magnitude 9.88 and separation 39", and E, at magnitude 13 and separation from D of 10.4".[12]

References

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[es] V Puppis