Delta2 Lyrae

For other stars with this Bayer designation, see δ Lyrae.
δ2 Lyrae
Location of δ2 Lyrae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 18h 54m 30.282689s[1]
Declination +36° 53′ 55.03167″[1]
Apparent magnitude (V) 4.22 – 4.33[2]
Characteristics
Spectral type M4 II[2]
U−B color index +1.65
B−V color index +1.68
Variable type SRc?[2]
Astrometry
Radial velocity (Rv)−25.55[citation needed] km/s
Proper motion (μ) RA: −6.598 mas/yr[1]
Dec.: 1.953 mas/yr[1]
Parallax (π)4.2352 ± 0.2951 mas[1]
Distance773+69
−39 ly
(237+21
−13 pc)[3]
Absolute magnitude (MV)−3.3[4]
Details
Mass4.5±1[5] M☉
Radius293+19
−22[6] – 318[5][a] R☉
Luminosity12,470[5] – 12,900[7] L☉
Surface gravity (log g)0[8] cgs
Temperature3,420[5] K
Age75[9][b] Myr
Other designations
Delta2 Lyrae, 12 Lyrae, HR 7139, BD+36°3319, HD 175588, SAO 67559, HIP 92791, GC 25959, CCDM J18545+3654, WDS J18545+3654
Database references
SIMBADdata

Delta2 Lyrae (δ2 Lyr) is a 4th magnitude star in the constellation Lyra, approximately 770 light years away from Earth. It is one of the M4II spectral standard stars.[10]

  1. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference b-j was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference eggen was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference halabi was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference baines2021 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference tsuji2007 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference levesque was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference kaler was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference standard was invoked but never defined (see the help page).


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