HP Lyrae

HP Lyrae

A blue band light curve for HP Lyrae, adapted from Wenzel (2013)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 19h 21m 39.066s[2]
Declination +39° 56′ 08.05″[2]
Apparent magnitude (V) 10.43[3] (10.2 - 10.8[4])
Characteristics
Spectral type A2-F2 Iab[4]
U−B color index +0.1 - +0.5[4]
B−V color index +0.3 - +0.7[4]
Variable type RV Tau[5]
Astrometry
Radial velocity (Rv)−107[5] km/s
Proper motion (μ) RA: −2.485±0.038[6] mas/yr
Dec.: −5.500±0.047[6] mas/yr
Parallax (π)0.0822 ± 0.0242 mas[6]
Distance6,700±380[7] pc
Absolute magnitude (MV)−4.5[4]
Orbit[7]
Period (P)1,631 days
Eccentricity (e)0.17
Argument of periastron (ω)
(secondary)		5.5°
Semi-amplitude (K1)
(primary)		7.7 km/s
Details[5]
Mass0.6[7] M☉
Radius60[7] R☉
Luminosity3,900±400[7] L☉
Surface gravity (log g)1.0 cgs
Temperature5,900[7] K
Metallicity [Fe/H]−1.0 dex
B
Mass0.5 - 0.6[7] M☉
Other designations
HP Lyrae, TYC 3138-54-1, ASAS J192139+3956.1, IRAS 19199+3950, 2MASS J19213906+3956080, AAVSO 1918+39
Database references
SIMBADdata

HP Lyrae (HP Lyr) is a variable star in the constellation Lyra, with a visual magnitude varying between 10.2 and 10.8. It will likely be an RV Tauri variable, an unstable post-AGB star losing mass before becoming a white dwarf.

  1. ^ Cite error: The named reference wenzel2013 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference 2mass was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference GraczykMikolajewski2002 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference giridhar was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference manick was invoked but never defined (see the help page).