PU Puppis

This article is about m Puppis and is not to be confused with M Puppis.

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]

A light curve for PU Puppis, plotted from TESS data^[9]

PU Puppis

Location of PU Puppis (circled)
Observation data Epoch J2000      Equinox J2000
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 mas[1]
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	11,500±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	5,000±350 K
Other designations
m Puppis, PU Pup, CD−25°4828, CCDM J07383-2522AB, GC 10266, HIP 37173, HR 2944, HD 61429, SAO 174175, WDS J07383-2522AB
Database references
SIMBAD	data

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 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]