EG Andromedae

EG Andromedae

The visual band light curve of EG Andromedae, adapted from Skopal (2006)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 44m 37.1876s[2]
Declination +40° 40′ 45.70303″[2]
Apparent magnitude (V) 6.97 – 7.80 variable [3]
Characteristics
Spectral type M2IIIep[3]
Apparent magnitude (U) 10.54[4]
Apparent magnitude (B) 8.93[4]
Apparent magnitude (V) 7.22[4]
Apparent magnitude (G) 6.3090[2]
Apparent magnitude (J) 3.65[4]
Apparent magnitude (H) 2.79[4]
Apparent magnitude (K) 2.56[4]
U−B color index 3.32[4]
B−V color index 1.71[4]
Variable type Symbiotic[3]
Astrometry
Radial velocity (Rv)−94.80±0.30[5] km/s
Proper motion (μ) RA: 8.452±0.072 [2] mas/yr
Dec.: −15.354±0.053[2] mas/yr
Parallax (π)1.4860 ± 0.0389 mas[2]
Distance2,190 ± 60 ly
(670 ± 20 pc)
Orbit
Period (P)482.5±1.3 days[6]
Eccentricity (e)0[6]
Inclination (i)60[7]°
Semi-amplitude (K1)
(primary)
7.30±0.13[6] km/s
Details
White dwarf
Mass0.4[8] M
Radius1.9–2.3×10−2[7] R
Luminosity12.9-38.4[7] L
Surface gravity (log g)7.5[7] cgs
Temperature80–95×103[7] K
Donor star
Mass1.1 – 2.4[6] M
Temperature3730±130[6] K
Other designations
2MASS J00443718+4040456, BD+39 167, HD 4174, HIP 3494, SAO 36618, TYC 2801-1704-1
Database references
SIMBADdata

EG Andromedae (often abbreviated to EG And) is a symbiotic binary in the constellation Andromeda. Its apparent visual magnitude varies between 6.97 and 7.80.[3]

  1. ^ Cite error: The named reference skopal was invoked but never defined (see the help page).
  2. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ a b c d Cite error: The named reference GCVS was invoked but never defined (see the help page).
  4. ^ a b c d e f g h Cite error: The named reference 11colors was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Kenyon2016 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Sion2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Nunez2016 was invoked but never defined (see the help page).