  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 04h 55m 11.20309s [1] |
| Declination | −74° 56′ 12.6705″ [1] |
| Apparent magnitude (V) | 5.47 [2] |
| Characteristics | |
| Spectral type | K4 III [3] [4] |
| U−B color index | +1.82 [2] |
| B−V color index | +1.52 [2] |
| Astrometry | |
| Proper motion (μ) |
RA: +28.27
[1]
mas/
yr Dec.: +61.52 [1] mas/ yr |
| Parallax (π) | 5.0299 ± 0.0998 mas [5] |
| Distance | 650 ± 10
ly (199 ± 4 pc) |
| Absolute magnitude (MV) | −1.08 [6] |
| Details | |
| Luminosity | 616 [7] L☉ |
| Surface gravity (log g) | 1.15 [8] cgs |
| Temperature | 4,055 [7] K |
| Metallicity [Fe/H] | −0.17 [8] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta Mensae, Latinized from η Mensae, is the Bayer designation for a solitary, [4] orange-hued star in the southern constellation of Mensa. This object has an apparent visual magnitude of 5.47, [2] which is sufficiently luminous to be faintly visible to the naked eye. Based upon an annual parallax shift of 4.88 mas as seen from Earth, [1] this star is located roughly 670 light years from the Sun.
This is an evolved K-type giant star with a stellar classification of K4 III. [3] It is radiating 616 times the Sun's luminosity from its photosphere at an effective temperature of 4,055 K. [7] The star displays an infrared excess that suggests the presence of circumstellar dust. [10] [11] Eta Mensae is a probable member of the stream of stars associated with the Hyades cluster. [12]
- ^ 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 c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ^ a b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c 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 Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069, Bibcode: 2010A&A...515A.111S, doi: 10.1051/0004-6361/201014247, S2CID 118362423.
-
^
"eta Men".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2017-08-15.
{{ cite web}}: CS1 maint: postscript ( link) - ^ Kim, Sungsoo S.; et al. (April 2001), "Extent of Excess Far-Infrared Emission around Luminosity Class III Stars", The Astrophysical Journal, 550 (2): 1000–1006, arXiv: astro-ph/0012001, Bibcode: 2001ApJ...550.1000K, doi: 10.1086/319803, S2CID 118903790.
- ^ Zuckerman, B.; et al. (June 1995), "Luminosity Class III Stars with Excess Far-Infrared Emission", Astrophysical Journal Letters, 446: L79, Bibcode: 1995ApJ...446L..79Z, doi: 10.1086/187935.
- ^ Eggen, Olin J. (1996), "The Stellar Content of Star Stream I", Astronomical Journal, 111: 1615, Bibcode: 1996AJ....111.1615E, doi: 10.1086/117901.
| Stars |
| ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||
| |||||||||||
| |||||||||||
| Galaxies |
| ||||||||||
| |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 04h 55m 11.20309s [1] |
| Declination | −74° 56′ 12.6705″ [1] |
| Apparent magnitude (V) | 5.47 [2] |
| Characteristics | |
| Spectral type | K4 III [3] [4] |
| U−B color index | +1.82 [2] |
| B−V color index | +1.52 [2] |
| Astrometry | |
| Proper motion (μ) |
RA: +28.27
[1]
mas/
yr Dec.: +61.52 [1] mas/ yr |
| Parallax (π) | 5.0299 ± 0.0998 mas [5] |
| Distance | 650 ± 10
ly (199 ± 4 pc) |
| Absolute magnitude (MV) | −1.08 [6] |
| Details | |
| Luminosity | 616 [7] L☉ |
| Surface gravity (log g) | 1.15 [8] cgs |
| Temperature | 4,055 [7] K |
| Metallicity [Fe/H] | −0.17 [8] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta Mensae, Latinized from η Mensae, is the Bayer designation for a solitary, [4] orange-hued star in the southern constellation of Mensa. This object has an apparent visual magnitude of 5.47, [2] which is sufficiently luminous to be faintly visible to the naked eye. Based upon an annual parallax shift of 4.88 mas as seen from Earth, [1] this star is located roughly 670 light years from the Sun.
This is an evolved K-type giant star with a stellar classification of K4 III. [3] It is radiating 616 times the Sun's luminosity from its photosphere at an effective temperature of 4,055 K. [7] The star displays an infrared excess that suggests the presence of circumstellar dust. [10] [11] Eta Mensae is a probable member of the stream of stars associated with the Hyades cluster. [12]
- ^ 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 c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ^ a b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c 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 Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069, Bibcode: 2010A&A...515A.111S, doi: 10.1051/0004-6361/201014247, S2CID 118362423.
-
^
"eta Men".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2017-08-15.
{{ cite web}}: CS1 maint: postscript ( link) - ^ Kim, Sungsoo S.; et al. (April 2001), "Extent of Excess Far-Infrared Emission around Luminosity Class III Stars", The Astrophysical Journal, 550 (2): 1000–1006, arXiv: astro-ph/0012001, Bibcode: 2001ApJ...550.1000K, doi: 10.1086/319803, S2CID 118903790.
- ^ Zuckerman, B.; et al. (June 1995), "Luminosity Class III Stars with Excess Far-Infrared Emission", Astrophysical Journal Letters, 446: L79, Bibcode: 1995ApJ...446L..79Z, doi: 10.1086/187935.
- ^ Eggen, Olin J. (1996), "The Stellar Content of Star Stream I", Astronomical Journal, 111: 1615, Bibcode: 1996AJ....111.1615E, doi: 10.1086/117901.
| Stars |
| ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||
| |||||||||||
| |||||||||||
| Galaxies |
| ||||||||||