  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 43m 59.48560s [1] |
| Declination | 29° 21′ 41.2342″ [1] |
| Apparent magnitude (V) | 4.93
[2] (5.07 / 8.10) [3] |
| Characteristics | |
| Spectral type | K0III [4] |
| U−B color index | +0.63 [5] |
| B−V color index | +0.96 [5] |
| Astrometry | |
| Radial velocity (Rv) | −8.33 [6] km/s |
| Proper motion (μ) |
RA: +71.10
[1]
mas/
yr Dec.: -40.58 [1] mas/ yr |
| Parallax (π) | 14.54 ± 0.56 mas [1] |
| Distance | 224 ± 9
ly (69 ± 3 pc) |
| Absolute magnitude (MV) | 0.75 [2] |
| Orbit [3] | |
| Period (P) | 630.15 yr |
| Semi-major axis (a) | 1.614″ |
| Eccentricity (e) | 0.112 |
| Inclination (i) | 60.64° |
| Longitude of the node (Ω) | 172.55° |
| Periastron epoch (T) | B 2247.71 |
|
Argument of periastron (ω) (secondary) | 241.27° |
| Details | |
| 78 Peg A | |
| Mass | 1.50 [7] M☉ |
| Radius | 10 [7] R☉ |
| Luminosity | 57.35 [2] L☉ |
| Surface gravity (log g) | 2.62 [7] cgs |
| Temperature | 4,898 [7] K |
| Metallicity [Fe/H] | +0.01 [2] dex |
| Rotational velocity (v sin i) | 1.1 [8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
78 Pegasi is a binary star system in the northern constellation of Pegasus. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.93. [2] The system is located approximately 224 light years from the Sun based on parallax, [1] but is drifting closer with a radial velocity of −8 km/s. [6] The double-star nature of this system was discovered by A. G. Clark in 1862. The components of this system orbit each other over a 630-year period with an eccentricity of 0.11. [10]
The primary member, designated component A, is a magnitude 5.07 [3] giant star with a stellar classification of K0III, [4] having exhausted the supply of hydrogen at its core and expanded to 10 [7] times the Sun's radius. It is a red clump giant, [11] which indicates it is on the horizontal branch and is generating energy through core helium fusion. It has 1.5 [7] times the mass of the Sun and is radiating 57 [2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,898 K. [7] The secondary companion, component B, is magnitude 8.10. [3]
- ^ a b c d e f 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. Vizier catalog entry
- ^ a b c d e f 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. Vizier catalog entry
- ^ a b c d "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 26 May 2017.
- ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode: 1995yCat.5050....0H.
- ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
- ^ a b Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209–231. Bibcode: 2008AJ....135..209M. doi: 10.1088/0004-6256/135/1/209. S2CID 121883397.
- ^ a b c d e f g Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. Vizier catalog entry
- ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv: astro-ph/0608248. Bibcode: 1999A&AS..139..433D. doi: 10.1051/aas:1999401. Vizier catalog entry
- ^ "78 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-06.
- ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode: 2012A&A...546A..69M. doi: 10.1051/0004-6361/201219774. Vizier catalog entry
- ^ Tautvaišienė, G.; et al. (December 2010), "C, N and O abundances in red clump stars of the Milky Way", Monthly Notices of the Royal Astronomical Society, 409 (3): 1213–1219, arXiv: 1007.4064, Bibcode: 2010MNRAS.409.1213T, doi: 10.1111/j.1365-2966.2010.17381.x, S2CID 119182458.
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 43m 59.48560s [1] |
| Declination | 29° 21′ 41.2342″ [1] |
| Apparent magnitude (V) | 4.93
[2] (5.07 / 8.10) [3] |
| Characteristics | |
| Spectral type | K0III [4] |
| U−B color index | +0.63 [5] |
| B−V color index | +0.96 [5] |
| Astrometry | |
| Radial velocity (Rv) | −8.33 [6] km/s |
| Proper motion (μ) |
RA: +71.10
[1]
mas/
yr Dec.: -40.58 [1] mas/ yr |
| Parallax (π) | 14.54 ± 0.56 mas [1] |
| Distance | 224 ± 9
ly (69 ± 3 pc) |
| Absolute magnitude (MV) | 0.75 [2] |
| Orbit [3] | |
| Period (P) | 630.15 yr |
| Semi-major axis (a) | 1.614″ |
| Eccentricity (e) | 0.112 |
| Inclination (i) | 60.64° |
| Longitude of the node (Ω) | 172.55° |
| Periastron epoch (T) | B 2247.71 |
|
Argument of periastron (ω) (secondary) | 241.27° |
| Details | |
| 78 Peg A | |
| Mass | 1.50 [7] M☉ |
| Radius | 10 [7] R☉ |
| Luminosity | 57.35 [2] L☉ |
| Surface gravity (log g) | 2.62 [7] cgs |
| Temperature | 4,898 [7] K |
| Metallicity [Fe/H] | +0.01 [2] dex |
| Rotational velocity (v sin i) | 1.1 [8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
78 Pegasi is a binary star system in the northern constellation of Pegasus. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.93. [2] The system is located approximately 224 light years from the Sun based on parallax, [1] but is drifting closer with a radial velocity of −8 km/s. [6] The double-star nature of this system was discovered by A. G. Clark in 1862. The components of this system orbit each other over a 630-year period with an eccentricity of 0.11. [10]
The primary member, designated component A, is a magnitude 5.07 [3] giant star with a stellar classification of K0III, [4] having exhausted the supply of hydrogen at its core and expanded to 10 [7] times the Sun's radius. It is a red clump giant, [11] which indicates it is on the horizontal branch and is generating energy through core helium fusion. It has 1.5 [7] times the mass of the Sun and is radiating 57 [2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,898 K. [7] The secondary companion, component B, is magnitude 8.10. [3]
- ^ a b c d e f 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. Vizier catalog entry
- ^ a b c d e f 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. Vizier catalog entry
- ^ a b c d "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 26 May 2017.
- ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode: 1995yCat.5050....0H.
- ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
- ^ a b Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209–231. Bibcode: 2008AJ....135..209M. doi: 10.1088/0004-6256/135/1/209. S2CID 121883397.
- ^ a b c d e f g Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. Vizier catalog entry
- ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv: astro-ph/0608248. Bibcode: 1999A&AS..139..433D. doi: 10.1051/aas:1999401. Vizier catalog entry
- ^ "78 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-06.
- ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode: 2012A&A...546A..69M. doi: 10.1051/0004-6361/201219774. Vizier catalog entry
- ^ Tautvaišienė, G.; et al. (December 2010), "C, N and O abundances in red clump stars of the Milky Way", Monthly Notices of the Royal Astronomical Society, 409 (3): 1213–1219, arXiv: 1007.4064, Bibcode: 2010MNRAS.409.1213T, doi: 10.1111/j.1365-2966.2010.17381.x, S2CID 119182458.
| Stars |
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Star clusters |
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| Nebulae |
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| Galaxies |
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