74 Geminorum

74 Geminorum (f Geminorum) is a K-type giant star in the constellation Gemini. It is located about 640 light-years from Earth based on its Gaia DR3 parallax. The star is often subject to lunar occultations, allowing an accurate measurement of its angular diameter.[1] It has an apparent magnitude of 5.05, making it faintly visible to the naked eye.[2]

74 Geminorum
Location of 74 Geminorum in Gemini (circled)[2]
Observation data
Epoch J2000      Equinox J2000
Constellation Gemini
Right ascension 07h 39m 28.593s[3]
Declination +17° 40′ 28.28″[3]
Apparent magnitude (V) 5.05[4]
Characteristics
Evolutionary stage K-type giant
Spectral type K5.5III[4]
Apparent magnitude (U) 8.53[4]
Apparent magnitude (B) 6.61[4]
Apparent magnitude (G) 4.348±0.003[4]
Apparent magnitude (J) 2.11[4]
Apparent magnitude (H) 1.32[4]
Apparent magnitude (K) 1.14[4]
B−V color index 1.616±0.007[5]
Astrometry
Radial velocity (Rv)25.38±0.19[6] km/s
Proper motion (μ) RA: 5.374 mas/yr[3]
Dec.: -1.199 mas/yr[3]
Parallax (π)5.1083 ± 0.0964 mas[3]
Distance640 ± 10 ly
(196 ± 4 pc)
Absolute magnitude (MV)-1.01[2]
Details
Radius89.6[a] R☉
Luminosity666[7] L☉
Temperature3,933[7] K
Other designations
f Gem, 74 Gem, BD+18 1701, Gaia DR2 671137503843195392, Gaia DR3 671137503843195392, HD 61338, HIP 37300, HR 2938, SAO 97120, PPM 124288, WDS J07395+1740AB, TIC 16134382, TYC 1365-2474-1, GSC 01365-02474, IRAS 07366+1747, 2MASS J07392860+1740282
Database references
SIMBADdata
  1. ^ a b Dyachenko, V.; Richichi, A.; Balega, Yu; Beskakotov, A.; Maksimov, A.; Mitrofanova, A.; Rastegaev, D. (2018-08-01). "Lunar occultation observations at the SAO RAS 6-m telescope". Monthly Notices of the Royal Astronomical Society. 478 (4): 5683–5688. Bibcode:2018MNRAS.478.5683D. doi:10.1093/mnras/sty1427. ISSN 0035-8711.
  2. ^ a b c Cite error: The named reference :3 was invoked but never defined (see the help page).
  3. ^ 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.
  4. ^ a b c d e f g h Cite error: The named reference :0 was invoked but never defined (see the help page).
  5. ^ a b van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Hipparcos record for this source at VizieR.
  6. ^ Cite error: The named reference :5 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference :4 was invoked but never defined (see the help page).


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