DY Pegasi

DY Pegasi

A visual band light curve DY Pegasi, plotted from ASAS-SN data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 08m 51.186s[2]
Declination +17° 12′ 56.00″[2]
Apparent magnitude (V) 9.95 – 10.62[3]
Characteristics
Spectral type A3 to F1[4]
Variable type SX Phe[5][3]
Astrometry
Radial velocity (Rv)−25.30±2.7[6] km/s
Proper motion (μ) RA: 47.248 mas/yr[2]
Dec.: −22.103 mas/yr[2]
Parallax (π)2.4588 ± 0.0452 mas[2]
Distance1,330 ± 20 ly
(407 ± 7 pc)
Absolute magnitude (MV)2.34[7]
0.84[8]
Orbit[5]
Period (P)15,425.0±205.7 d
Semi-major axis (a)≥ 0.254±0.034 AU
Eccentricity (e)0.65 ± 0.10
Periastron epoch (T)2438276.86149 ± 0.00013 HJD
Details
Mass1.54 M☉[7]
1.40[8] M☉
Radius2.09±0.25 R☉[4]
3.74 – 3.95[8] R☉
Luminosity11.34+2.82
−2.51 L☉[4]
34.6±2.1[8] L☉
Temperature7,660 K[7] (7,950 – 6,750)[9] K
Metallicity [Fe/H]−0.56[5] dex
Rotational velocity (v sin i)23.6[5] km/s
Age1.7[7] Gyr
Other designations
DY Peg, BD+16°4877, HD 218549, HIP 114290[10]
Database references
SIMBADdata

DY Pegasi, abbreviated DY Peg, is a binary star[5] system in the northern constellation of Pegasus. It is a well-studied[11] SX Phoenicis variable star with a brightness that ranges from an apparent visual magnitude of 9.95 down to 10.62 with a period of 1.75 hours.[3] This system is much too faint to be seen with the naked eye, but can be viewed with large binoculars or a telescope.[12] Based on its high space motion and low abundances of heavier elements, it is a population II star system.[13]

  1. ^ Cite error: The named reference ASAS-SN was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Samus_et_al_2017 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Wilson_et_al_1998 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Xue_Niu_2020 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Hintz_et_al_2004 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Barcza_Benkő_2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Meylan_et_al_1986 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Fu_et_al_2009 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference ICQ was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Frolov_Irkaev_1984 was invoked but never defined (see the help page).