Observation data Equinox J2000.0]] (ICRS) | |
---|---|
Constellation | Puppis |
Right ascension | 07h 38m 18.04541s[1] |
Declination | −25° 21′ 53.3017″[1] |
Apparent magnitude (V) | 4.69[2] |
Characteristics | |
Spectral type | B8III[3] |
U−B color index | −0.35[4] |
B−V color index | −0.11[4] |
Variable type | β Lyr[5] |
Astrometry | |
Radial velocity (Rv) | +41.00[6] km/s |
Proper motion (μ) | RA: −3.03[1] mas/yr Dec.: −7.42[1] mas/yr |
Parallax (π) | 5.27 ± 0.26[1] mas |
Distance | 620 ± 30 ly (190 ± 9 pc) |
Absolute magnitude (MV) | −1.80 ± 0.25 (−1.77 + 5.85)[7] |
Absolute bolometric magnitude (Mbol) | −2.35 + 5.54[7] |
Orbit[7] | |
Period (P) | 2.58237 ± 0.00005 d |
Semi-major axis (a) | 13.30 ± 0.40 R☉ |
Inclination (i) | 56.2° |
Details[7] | |
PU Pup A | |
Mass | 4.10 ± 0.20 M☉ |
Radius | 6.60 ± 0.30 R☉ |
Luminosity | 695 ± 80 L☉ |
Surface gravity (log g) | 3.40 ± 0.05 cgs |
Temperature | 11500 ± 500 K |
Rotational velocity (v sin i) | 123[8] km/s |
PU Pup B | |
Mass | 0.65 ± 0.05 M☉ |
Radius | 0.90 ± 0.10 R☉ |
Luminosity | 0.50 ± 0.10 L☉ |
Surface gravity (log g) | 4.30 ± 0.10 cgs |
Temperature | 5000 ± 350 K |
Other designations | |
Database references | |
SIMBAD | data |
PU Puppis (PU Pup) is a class B8III[3] (blue giant) star in the constellation Puppis. Its apparent magnitude is 4.69[2] and it is approximately 620 light years away based on parallax.[1]
It is a β Lyrae variable, ranging from 4.75 to 4.69 magnitude with a period of 2.58 days.[5] The secondary is estimated at about 5.6 magnitude, although recent observations have failed to confirm it.[10][11] The primary has a mass of 4.10 solar masses, and is radiating at an effective temperature of 11,500 K. The secondary, with a mass 65% that of the Sun, has a surface temperature of about 5,000 K.[7]
Original source: https://en.wikipedia.org/wiki/PU Puppis.
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