HD 3322

HD 3322

Ultraviolet, blue and visual band light curves for PY Andromedae, plotted from data published by Catalano and Leone (1991)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 36m 20.09863s[2]
Declination +27° 15′ 17.1519″[2]
Apparent magnitude (V) 6.51[3]
Characteristics
Evolutionary stage Main sequence[4]
Spectral type B8.5 IIIp HgMn[5]
B−V color index −0.070±0.011[3]
Variable type α2 CVn[6]
Astrometry
Radial velocity (Rv)+4.0±7.4[7] km/s
Proper motion (μ) RA: +15.96[2] mas/yr
Dec.: −11.11[2] mas/yr
Parallax (π)4.59 ± 0.65 mas[2]
Distanceapprox. 700 ly
(approx. 220 pc)
Absolute magnitude (MV)−0.13[3]
Orbit[8]
Period (P)399.6±2.1 d
Eccentricity (e)0.57±0.09
Periastron epoch (T)2440462.38 ± 6.05 JD
Argument of periastron (ω)
(secondary)		304±11°
Semi-amplitude (K1)
(primary)		8.07±1.07 km/s
Details
HD 3322 A
Mass3.68±0.21[4] M☉
Radius4.8[9] R☉
Luminosity246+91
−66[4] L☉
Surface gravity (log g)3.821±0.056[10] cgs
Temperature12,882+90
−88[4] K
Rotational velocity (v sin i)14[4] km/s
Other designations
PY And, BD+26° 91, HD 3322, HIP 2865, HR 149, SAO 74136, PPM 89965[11]
Database references
SIMBADdata

HD 3322 is a binary star[8] system in the northern constellation of Andromeda. With an apparent visual magnitude of 6.51,[3] it lies below the nominal brightness limit for visibility with the normal naked eye, but it is still possible to see the star with excellent vision under ideal seeing conditions. An annual parallax shift of 4.59±0.65 mas[2] provides a distance estimate of roughly 700 light years.

This is a single-lined spectroscopic binary star system with an orbital period of around 400 days and an eccentricity of 0.57.[8] The visible component has a stellar classification of B8.5 IIIp HgMn,[5] matching a chemically peculiar B-type giant mercury-manganese star.[12] Catalano and Leone (1991) found it to be a α2 CVn variable with a period of 4.6904 days,[1] and thus it received the variable star designation PY And.[6] It has an estimated 3.7[4] times the mass of the Sun and about 4.8[9] times the Sun's radius. It is radiating around 246[4] times the Sun's luminosity from its photosphere at an effective temperature of 12,882 K.[4]

  1. ^ a b Cite error: The named reference Catalano1991 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b c d e f g h Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Kazarovets1993 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Stickland1984 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference wolframalpha was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Huang2010 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 Renson2009 was invoked but never defined (see the help page).