Astronomy:HD 194244
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Short description: Star in the constellation Aquila
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 20h 24m 37.49817s[2] |
| Declination | +01° 04′ 06.2574″[2] |
| Apparent magnitude (V) | 6.14[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | B9V[5] |
| U−B color index | −0.14[3] |
| B−V color index | −0.04[3] |
| Astrometry | |
| Radial velocity (Rv) | −9.6±0.9[6] km/s |
| Proper motion (μ) | RA: +7.834[2] mas/yr Dec.: +4.935[2] mas/yr |
| Parallax (π) | 4.0349 ± 0.0.428[2] mas |
| Distance | 808 ± 0 ly (248 ± 0 pc) |
| Absolute magnitude (MV) | −0.80[1] |
| Details | |
| Mass | 2.5[7] M☉ |
| Radius | 4.9[7] R☉ |
| Luminosity | 238[7] L☉ |
| Surface gravity (log g) | 3.48[7] cgs |
| Temperature | 10,233[7] K |
| Metallicity [Fe/H] | −0.22[8] dex |
| Rotation | 27.15[9] |
| Rotational velocity (v sin i) | 222[4] km/s |
| Age | 243[10] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 194244 is a variable Be star[11] in the equatorial constellation of Aquila. With an apparent magnitude of 6.14, according to the Bortle scale it is faintly visible to the naked eye from rural skies on a dark night.
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 Cousins, A. W. J. (1964), "Photometric Data for Stars in the Equatorial Zone (Seventh List)", Monthly Notes of the Astronomical Society of Southern Africa 23: 175, Bibcode: 1964MNSSA..23..175C
- ↑ 4.0 4.1 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z
- ↑ Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C
- ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G
- ↑ 7.0 7.1 7.2 7.3 7.4 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ Katz, D.; Soubiran, C.; Cayrel, R.; Barbuy, B.; Friel, E.; Bienaymé, O.; Perrin, M. -N. (2011), "Probing the Galactic thick disc vertical properties and interfaces", Astronomy and Astrophysics 525: A90, doi:10.1051/0004-6361/201014840, Bibcode: 2011A&A...525A..90K
- ↑ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G. et al. (2018), "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey", The Astronomical Journal 155 (1): 39, doi:10.3847/1538-3881/aa9bf4, Bibcode: 2018AJ....155...39O
- ↑ Gontcharov, G. A. (2012), "Dependence of kinematics on the age of stars in the solar neighborhood", Astronomy Letters 38 (12): 771, doi:10.1134/S1063773712120031, Bibcode: 2012AstL...38..771G
- ↑ Neiner, C.; Hubert, A.-M.; Catala, C. (February 2005), "The Identification of New Be Stars in GAUDI", The Astrophysical Journal Supplement Series 156 (2): 237–243, doi:10.1086/426670, Bibcode: 2005ApJS..156..237N
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