Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
HD 5789 | |
Right ascension | 01h 00m 03.55767s [1] |
Declination | +44° 42′ 47.6898″ [1] |
Apparent magnitude (V) | 6.06 [2] |
HD 5788 | |
Right ascension | 01h 00m 03.38277s [1] |
Declination | +44° 42′ 40.0515″ [1] |
Apparent magnitude (V) | 6.763 [3] |
Characteristics | |
HD 5789 | |
Spectral type | B9.5Vnn (λ Boo) [4] |
B−V color index | −0.031 [5] |
HD 5788 | |
Spectral type | A2 Vn [6] |
B−V color index | −0.010 [5] |
Astrometry | |
Radial velocity (Rv) | +4.4±3.3 [7] km/s |
Proper motion (μ) |
RA: +13.85
[8]
mas/
yr Dec.: −23.83 [8] mas/ yr |
Parallax (π) | 6.6432 ± 0.0809 mas [1] |
Distance | 491 ± 6
ly (151 ± 2 pc) |
Proper motion (μ) |
RA: +11.582
[1]
mas/
yr Dec.: −24.369 [1] mas/ yr |
Parallax (π) | 6.5625 ± 0.0688 mas [1] |
Distance | 497 ± 5
ly (152 ± 2 pc) |
Details | |
HD 5789 | |
Mass | 2.74±0.12 [9] M☉ |
Luminosity | 85.6+19.2 −15.6 [9] L☉ |
Temperature | 9,977 [5] K |
Rotational velocity (v sin i) | 249 [9] km/s |
HD 5788 | |
Mass | 2.67±0.12 [9] M☉ |
Luminosity | 73.3+18.4 −14.7 [9] L☉ |
Temperature | 9,840 [5] K |
Rotational velocity (v sin i) | 270 [9] km/s |
Other designations | |
HD 5789: HR 283, SAO 36833 [10] | |
HD 5788: HR 282, SAO 36832 [11] | |
Database references | |
HD 5789 | |
SIMBAD | data |
HD 5788 | |
SIMBAD | data |
HD 5789 and HD 5788 is a pair of stars comprising a binary star [12] system in the northern constellation of Andromeda. Located approximately 151 parsecs (490 ly) away, the primary is a hot, massive blue star with an apparent magnitude of 6.06 while the secondary is slightly smaller and cooler, with an apparent magnitude of 6.76. Both stars are main-sequence stars, meaning that they are currently fusing hydrogen into helium in their cores. As of 2016, the pair had an angular separation of 7.90 ″ along a position angle of 195°. [13] While both have a similar proper motion and parallax, there's still no proof that the pair is gravitationally bound.
The primary component is HD 5789, a B-type main-sequence star with a stellar classification of B9.5Vnn (λ Boo), where the 'n' indicates "nebulous" lines due to rapid rotation. Abt and Morrell (1995) listed it as a Lambda Boötis star, [4] although this is disputed. [14] It has 2.7 times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 249 km/s. [9] The star is radiating 86 [9] times the Sun's luminosity from its photosphere at an effective temperature of 9,977 K. [5]
The fainter secondary component is an A-type main-sequence star with a class of A2 Vn. [6] It shows a projected rotational velocity of 270 km/s and has 2.7 times the Sun's mass. The star shines with 73 [9] times the Sun's luminosity at an effective temperature of 9,840 K. [5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
HD 5789 | |
Right ascension | 01h 00m 03.55767s [1] |
Declination | +44° 42′ 47.6898″ [1] |
Apparent magnitude (V) | 6.06 [2] |
HD 5788 | |
Right ascension | 01h 00m 03.38277s [1] |
Declination | +44° 42′ 40.0515″ [1] |
Apparent magnitude (V) | 6.763 [3] |
Characteristics | |
HD 5789 | |
Spectral type | B9.5Vnn (λ Boo) [4] |
B−V color index | −0.031 [5] |
HD 5788 | |
Spectral type | A2 Vn [6] |
B−V color index | −0.010 [5] |
Astrometry | |
Radial velocity (Rv) | +4.4±3.3 [7] km/s |
Proper motion (μ) |
RA: +13.85
[8]
mas/
yr Dec.: −23.83 [8] mas/ yr |
Parallax (π) | 6.6432 ± 0.0809 mas [1] |
Distance | 491 ± 6
ly (151 ± 2 pc) |
Proper motion (μ) |
RA: +11.582
[1]
mas/
yr Dec.: −24.369 [1] mas/ yr |
Parallax (π) | 6.5625 ± 0.0688 mas [1] |
Distance | 497 ± 5
ly (152 ± 2 pc) |
Details | |
HD 5789 | |
Mass | 2.74±0.12 [9] M☉ |
Luminosity | 85.6+19.2 −15.6 [9] L☉ |
Temperature | 9,977 [5] K |
Rotational velocity (v sin i) | 249 [9] km/s |
HD 5788 | |
Mass | 2.67±0.12 [9] M☉ |
Luminosity | 73.3+18.4 −14.7 [9] L☉ |
Temperature | 9,840 [5] K |
Rotational velocity (v sin i) | 270 [9] km/s |
Other designations | |
HD 5789: HR 283, SAO 36833 [10] | |
HD 5788: HR 282, SAO 36832 [11] | |
Database references | |
HD 5789 | |
SIMBAD | data |
HD 5788 | |
SIMBAD | data |
HD 5789 and HD 5788 is a pair of stars comprising a binary star [12] system in the northern constellation of Andromeda. Located approximately 151 parsecs (490 ly) away, the primary is a hot, massive blue star with an apparent magnitude of 6.06 while the secondary is slightly smaller and cooler, with an apparent magnitude of 6.76. Both stars are main-sequence stars, meaning that they are currently fusing hydrogen into helium in their cores. As of 2016, the pair had an angular separation of 7.90 ″ along a position angle of 195°. [13] While both have a similar proper motion and parallax, there's still no proof that the pair is gravitationally bound.
The primary component is HD 5789, a B-type main-sequence star with a stellar classification of B9.5Vnn (λ Boo), where the 'n' indicates "nebulous" lines due to rapid rotation. Abt and Morrell (1995) listed it as a Lambda Boötis star, [4] although this is disputed. [14] It has 2.7 times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 249 km/s. [9] The star is radiating 86 [9] times the Sun's luminosity from its photosphere at an effective temperature of 9,977 K. [5]
The fainter secondary component is an A-type main-sequence star with a class of A2 Vn. [6] It shows a projected rotational velocity of 270 km/s and has 2.7 times the Sun's mass. The star shines with 73 [9] times the Sun's luminosity at an effective temperature of 9,840 K. [5]