  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 04h 52m 31.96357s [1] |
| Declination | +14° 15′ 02.3215″ [1] |
| Apparent magnitude (V) | 4.65 - 4.88 [2] |
| Characteristics | |
| Spectral type | M3S III [3] |
| U−B color index | +2.03 [4] |
| B−V color index | +1.74 [4] |
| Variable type | SRb [2] |
| Astrometry | |
| Radial velocity (Rv) | −8.40±0.23 [5] km/s |
| Proper motion (μ) |
RA: −0.05
[1]
mas/
yr Dec.: −54.81 [1] mas/ yr |
| Parallax (π) | 5.01 ± 0.71 mas [1] |
| Distance | approx. 650
ly (approx. 200 pc) |
| Details | |
| Mass | 0.9 [6] M☉ |
| Radius | 214±29 [6] R☉ |
| Luminosity | 4,046 [7] L☉ |
| Surface gravity (log g) | 0.76±0.29 [8] cgs |
| Temperature | 3,465±27 [8] K |
| Metallicity [Fe/H] | −0.03±0.12 [8] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omicron1 Orionis (ο1 Ori) is a binary star [9] in the northeastern corner of the constellation Orion. It is visible to the naked eye with an apparent visual magnitude of 4.7. [4] Based upon an annual parallax shift of 5.01±0.71 mas, it is located approximately 650 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an interstellar absorption factor of 0.27 due to intervening dust. [5]
The two components of this system have an orbital period of greater than 1,900 days (5.2 years). [9] The primary component is an evolved red giant with the stellar classification of M3S III. This is an S-type star on the asymptotic giant branch. [3] It is a semiregular variable [11] that is pulsating with periods of 30.8 and 70.7 days, each with nearly identical amplitudes of 0.05 in magnitude. [12] The star has an estimated 90% of the mass of the Sun but has expanded to 214 times the Sun's radius. [6] It shines with 4,046 [7] times the solar luminosity from its outer atmosphere at an effective temperature of 3,465 K. [8]
- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode: 2009yCat....102025S.
- ^ a b Cox, N. L. J.; et al. (January 2012), "A far-infrared survey of bow shocks and detached shells around AGB stars and red supergiants", Astronomy & Astrophysics, 537: 28, arXiv: 1110.5486, Bibcode: 2012A&A...537A..35C, doi: 10.1051/0004-6361/201117910, S2CID 56041336, A35.
- ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
- ^ a b Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv: astro-ph/0409579, Bibcode: 2005A&A...430..165F, doi: 10.1051/0004-6361:20041272, S2CID 17804304.
- ^ a b c Cruzalèbes, P.; Jorissen, A.; Rabbia, Y.; Sacuto, S.; Chiavassa, A.; Pasquato, E.; Plez, B.; Eriksson, K.; Spang, A.; Chesneau, O. (2013), "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER", Monthly Notices of the Royal Astronomical Society, 434 (1): 437–450, arXiv: 1306.3288, Bibcode: 2013MNRAS.434..437C, doi: 10.1093/mnras/stt1037, S2CID 49573767.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ a b c d Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv: 1104.4952, Bibcode: 2011A&A...531A.165P, doi: 10.1051/0004-6361/201116769, S2CID 54940439.
- ^ a b Udry, S.; Jorissen, A.; Mayor, M.; Van Eck, S. (July 1998), "A CORAVEL radial-velocity monitoring of giant BA and S stars: Spectroscopic orbits and intrinsic variations. I.", Astronomy and Astrophysics Supplement, 131: 25–41, arXiv: astro-ph/9801273, Bibcode: 1998A&AS..131...25U, doi: 10.1051/aas:1998249, S2CID 16326384.
- ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
- ^ Glass, I. S.; Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society, 378 (4): 1543–1549, arXiv: 0704.3150, Bibcode: 2007MNRAS.378.1543G, doi: 10.1111/j.1365-2966.2007.11903.x, S2CID 14332208.
- ^ Tabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945–1961, arXiv: 0908.3228, Bibcode: 2009MNRAS.400.1945T, doi: 10.1111/j.1365-2966.2009.15588.x, S2CID 15358380.
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| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 04h 52m 31.96357s [1] |
| Declination | +14° 15′ 02.3215″ [1] |
| Apparent magnitude (V) | 4.65 - 4.88 [2] |
| Characteristics | |
| Spectral type | M3S III [3] |
| U−B color index | +2.03 [4] |
| B−V color index | +1.74 [4] |
| Variable type | SRb [2] |
| Astrometry | |
| Radial velocity (Rv) | −8.40±0.23 [5] km/s |
| Proper motion (μ) |
RA: −0.05
[1]
mas/
yr Dec.: −54.81 [1] mas/ yr |
| Parallax (π) | 5.01 ± 0.71 mas [1] |
| Distance | approx. 650
ly (approx. 200 pc) |
| Details | |
| Mass | 0.9 [6] M☉ |
| Radius | 214±29 [6] R☉ |
| Luminosity | 4,046 [7] L☉ |
| Surface gravity (log g) | 0.76±0.29 [8] cgs |
| Temperature | 3,465±27 [8] K |
| Metallicity [Fe/H] | −0.03±0.12 [8] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omicron1 Orionis (ο1 Ori) is a binary star [9] in the northeastern corner of the constellation Orion. It is visible to the naked eye with an apparent visual magnitude of 4.7. [4] Based upon an annual parallax shift of 5.01±0.71 mas, it is located approximately 650 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an interstellar absorption factor of 0.27 due to intervening dust. [5]
The two components of this system have an orbital period of greater than 1,900 days (5.2 years). [9] The primary component is an evolved red giant with the stellar classification of M3S III. This is an S-type star on the asymptotic giant branch. [3] It is a semiregular variable [11] that is pulsating with periods of 30.8 and 70.7 days, each with nearly identical amplitudes of 0.05 in magnitude. [12] The star has an estimated 90% of the mass of the Sun but has expanded to 214 times the Sun's radius. [6] It shines with 4,046 [7] times the solar luminosity from its outer atmosphere at an effective temperature of 3,465 K. [8]
- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode: 2009yCat....102025S.
- ^ a b Cox, N. L. J.; et al. (January 2012), "A far-infrared survey of bow shocks and detached shells around AGB stars and red supergiants", Astronomy & Astrophysics, 537: 28, arXiv: 1110.5486, Bibcode: 2012A&A...537A..35C, doi: 10.1051/0004-6361/201117910, S2CID 56041336, A35.
- ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
- ^ a b Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv: astro-ph/0409579, Bibcode: 2005A&A...430..165F, doi: 10.1051/0004-6361:20041272, S2CID 17804304.
- ^ a b c Cruzalèbes, P.; Jorissen, A.; Rabbia, Y.; Sacuto, S.; Chiavassa, A.; Pasquato, E.; Plez, B.; Eriksson, K.; Spang, A.; Chesneau, O. (2013), "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER", Monthly Notices of the Royal Astronomical Society, 434 (1): 437–450, arXiv: 1306.3288, Bibcode: 2013MNRAS.434..437C, doi: 10.1093/mnras/stt1037, S2CID 49573767.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ a b c d Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv: 1104.4952, Bibcode: 2011A&A...531A.165P, doi: 10.1051/0004-6361/201116769, S2CID 54940439.
- ^ a b Udry, S.; Jorissen, A.; Mayor, M.; Van Eck, S. (July 1998), "A CORAVEL radial-velocity monitoring of giant BA and S stars: Spectroscopic orbits and intrinsic variations. I.", Astronomy and Astrophysics Supplement, 131: 25–41, arXiv: astro-ph/9801273, Bibcode: 1998A&AS..131...25U, doi: 10.1051/aas:1998249, S2CID 16326384.
- ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
- ^ Glass, I. S.; Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society, 378 (4): 1543–1549, arXiv: 0704.3150, Bibcode: 2007MNRAS.378.1543G, doi: 10.1111/j.1365-2966.2007.11903.x, S2CID 14332208.
- ^ Tabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945–1961, arXiv: 0908.3228, Bibcode: 2009MNRAS.400.1945T, doi: 10.1111/j.1365-2966.2009.15588.x, S2CID 15358380.
| Stars |
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Star clusters |
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| Nebulae |
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| Galaxies |
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