Gamma Doradus
γ Doradus
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
Constellation |
Dorado |
Right ascension |
04h 16m 01.5857s[1] |
Declination |
−51° 29′ 11.933″[1] |
Apparent magnitude (V) |
4.25[2]
|
Characteristics |
Spectral type |
F0V[2] |
U−B color index |
+0.03[3] |
B−V color index |
+0.30[3] |
R−I color index |
+0.16[3] |
Variable type |
Gamma Doradus variable[1] |
Astrometry |
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Radial velocity (Rv) | 25.2 ± 2[1] km/s |
Proper motion (μ) | RA: 100.57[1] mas/yr Dec.: 184.23[1] mas/yr |
Parallax (π) | 49.26 ± 0.50[1] mas |
Distance | 66.2 ± 0.7 ly (20.3 ± 0.2 pc) |
Absolute magnitude (MV) | 2.72[2] |
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Details |
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Mass | 1.57[2] M☉ |
Radius | 1.70[2] R☉ |
Luminosity (bolometric) | 7.0[2] L☉ |
Temperature | 7200[2] K |
Metallicity | [M/H] = −0.02[2] |
Rotational velocity (v sin i) | 62[2] km/s |
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Other designations |
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γ Dor, Gamma Doradus, Gamma Dor, CD−51 1066, CPD−51 524, FK5 157, GC 5179, GJ 167.1, GJ 9150, HD 27290, HIP 19893, HR 1338, PPM 333343, SAO 233457. [1] |
Database references |
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SIMBAD | data |
Gamma Doradus (Gamma Dor, γ Doradus, γ Dor) is the third brightest star in the constellation of Dorado.[4] It has an apparent visual magnitude of approximately 4.25 and is a variable star, the type star of the class of Gamma Doradus variables. These stars, like γ Doradus, are pulsating variables which vary in brightness by less than a tenth of a magnitude owing to nonradial gravity wave oscillations.[2] The magnitude of γ Doradus itself has been observed to have two sinusoidal variations with periods of approximately 17.6 and 18.2 hours. There is also some additional unexplained, apparently random fluctuation.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 V* gam Dor -- Variable Star of gamma Dor type, database entry, SIMBAD. Accessed on line November 17, 2008.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Gamma Doradus Stars: Defining a New Class of Pulsating Variables, Anthony B. Kaye et al., Publications of the Astronomical Society of the Pacific 111, #761 (July 1999), pp. 840–844, Bibcode: 1999PASP..111..840K.
- ↑ 3.0 3.1 3.2 HR 1338, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 17, 2008.
- ↑ Gamma Dor, Jim Kaler, Stars. Accessed on line November 17, 2008.
- ↑ γ Doradus: evidence for a new class of pulsating star, L. A. Balona, K. Krisciunas, and A. W. J. Cousins, Monthly Notices of the Royal Astronomical Society 270, #4 (October 15, 1994), pp. 905–913, Bibcode: 1994MNRAS.270..905B.
← Known celestial objects within 65–70 light-years → |
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| | Celestial objects by systems. Secondary members are listed in small print. |
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- Gliese 292.1 (65.2±1.4 ly)
- Gliese 268.2 (65.2±1.3 ly)
- GJ 1278 (65.3±1.4 ly)
- Gliese 342 (65.4±1.4 ly)
- Gliese 747.3 (65.4±2.0 ly)
- Gliese 456.1 (65.6±1.3 ly)
- star
- HD 110810 (65.6±1.3 ly)
- HD 136923 (65.7±1.2 ly)
- HD 149806 (65.7±1.2 ly)
- star
- GJ 3620 (65.9±1.7 ly)
- Gliese 765.4 (65.9±1.1 ly)
- star
- Gliese 199 (66.1±3.0 ly)
- star
- Gliese 836.8 (66.2±2.0 ly)
- Gliese 221 (66.3+2.3
−2.1 ly)
- 3 planets: b
- c
- d
- Gliese 840 (66.3±1.3 ly)
- GJ 2001 (66.3±1.1 ly)
- Gliese 558 (66.4±1.8 ly)
- Gliese 257.1 (66.6±1.3 ly)
- GJ 1069 (66.6+6.7
−5.6 ly)
- brown dwarf
- HD 114783 (66.6±1.5 ly)
- planet b
- DK Leonis (66.6±2.4 ly)
- HD 30501 (66.7±0.9 ly)
- star
- GJ 9714 (66.7±2.4 ly)
- Gliese 783.2 (66.8±1.3 ly)
- star
- GJ 1172 (66.9±2.3 ly)
- GJ 3358 (66.9±1.4 ly)
- HD 155712 (67.0±1.4 ly)
- Gliese 217 (67.1±1.4 ly)
- HD 332518 (67.3±1.7 ly)
- Gliese 808.2 (67.4±2.6 ly)
- GJ 1108 (67.6+4.7
−4.2 ly)
- star
- Gliese 53.1 (67.7±1.5 ly)
- star
- GJ 1084 (67.7±1.5 ly)
- GJ 1008 (67.7±2.5 ly)
- Gliese 30 (67.7±1.5 ly)
- Gliese 544 (67.8±1.6 ly)
- star
- GJ 1280 (67.9±1.5 ly)
- HD 104067 (67.9±1.5 ly)
- planet b
- Gliese 533 (68.0±2.6 ly)
- star
- Gliese 415 (68.2±2.8 ly)
- Gliese 371 (68.4±2.3 ly)
- HD 220221 (68.4±1.4 ly)
- HD 119802 (68.5±1.7 ly)
- Gliese 491 (68.5±1.3 ly)
- star
- HD 216259 (68.6±1.7 ly)
- Gliese 396 (68.6±0.9 ly)
- Gliese 889 (68.9±2.8 ly)
- star
- GJ 1165 (69.1±2.9 ly)
- Gliese 659 (69.2±2.9 ly)
- star
- Gliese 276 (69.3±1.9 ly)
- GJ 1048 (69.3±1.6 ly)
- Gliese 155.2 (69.5±1.4 ly)
- HD 97658 (69.5±1.5 ly)
- planet b
- HD 92945 (69.8±1.0 ly)
- Gliese 857.1 (69.8±2.6 ly)
- star
- V775 Herculis (69.9±1.6 ly)
- GJ 4268 (70.0±1.0 ly)
- star
- GJ 3071 (70.0±2.5 ly)
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- Gliese 328 (65.3±3.0 ly)
- planet b
- Gliese 330.1 (67.2±1.8 ly)
- CR Draconis (67.4±1.7 ly)
- HIP 105533 (67.6±2.3 ly)
- Gliese 336 (69.0+4.5
−4.0 ly)
- Gliese 122 (69.5±2.1 ly)
- GJ 4254 (69.8+14.1
−10.1 ly)
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- WISE 0413-4750 (~66.2 ly)
- WISE 0123+4142 (~67.2 ly)
- WISE 0625+5646 (~67.2 ly)
- WISE 0821+1443 (~68.2 ly)
- WISE 0448-1935 (~69.8 ly)
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- WISE 0535-7500 (68.5+42.4
−35.9 ly)
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| | Italic are systems without known trigonometric parallax. |
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