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]
  | |
| 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] |
| Distance | 640 ± 10 ly (196 ± 4 pc) |
| Absolute magnitude (MV) | -1.01[2] |
| Details | |
| Radius | 89.6[a] R☉ |
| Luminosity | 666[7] L☉ |
| Temperature | 3,933[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 | |
| SIMBAD | data |
- ^ 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.
- ^ a b c Cite error: The named reference
:3was invoked but never defined (see the help page). - ^ 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.
- ^ a b c d e f g h Cite error: The named reference
:0was invoked but never defined (see the help page). - ^ 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.
- ^ Cite error: The named reference
:5was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
:4was invoked but never defined (see the help page).
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