Nu Puppis

Nu Puppis
Location of ν Puppis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Puppis
Right ascension 06h 37m 45.67135s[1]
Declination −43° 11′ 45.3602″[1]
Apparent magnitude (V) 3.173[2]
Characteristics
Spectral type B8 III[3]
U−B color index −0.397[2]
B−V color index −0.113[2]
Astrometry
Radial velocity (Rv)+30.9[4] km/s
Proper motion (μ) RA: −0.44[1] mas/yr
Dec.: −3.87[1] mas/yr
Parallax (π)8.78 ± 0.26 mas[1]
Distance370 ± 10 ly
(114 ± 3 pc)
Absolute magnitude (MV)−2.11[5]
Details
Radius4.2[6] R☉
Luminosity767[7] L☉
Luminosity (bolometric)1,340[8] L☉
Temperature12,120[9] K
Rotational velocity (v sin i)225[10] km/s
Other designations
ν Pup, CPD−43° 946, HD 47670, HIP 31685, HR 2451, SAO 218071[11]
Database references
SIMBADdata

Nu Puppis (ν Puppis) is a solitary,[12] blue-hued star in the southern constellation of Puppis. It is the fifth-brightest star in Puppis, with an apparent visual magnitude of 3.17.[2] Based upon an annual parallax shift of 8.78 mas as seen from Earth,[1] it is located about 370 light years from the Sun. The system made its closest approach about 3.6 million years ago when it underwent perihelion passage at a distance of roughly 27 light years.[13]

The star has a stellar classification of B8 III,[3] matching a B-type giant. Absorption lines in the spectrum are displaying central quasi-emission peaks, indicating this is a Be shell star with a circumstellar disk of heated gas that is being seen edge-on.[14] ν Puppis is a candidate variable star showing an amplitude of 0.0117 magnitude with a frequency of 0.15292 per day.[15] It is spinning rapidly with a projected rotational velocity of 225 km/s. This rotation is giving the star an oblate shape, with the equator being 31% larger than the poles.[10] It is radiating (after allowance for ultraviolet radiation) 1,340[8] times the Sun's luminosity from its photosphere at an effective temperature of 12,120 K.[9]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Cousins1973 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference cadars was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference kaler2008 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Soubiran2010 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference belle2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference aa575_A35 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Rivinius1999 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference koen2002 was invoked but never defined (see the help page).