User:Bay Flam/note007
Kappa Boötis | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 13m 29.0078s |
| Declination | +51° 47′ 23.874″ |
| Characteristics | |
| Spectral type | A8IV |
| U−B color index | 0.14 |
| B−V color index | 0.2 |
| R−I color index | 0.12 |
| Variable type | Delta Scuti variable |
| Astrometry | |
| Radial velocity (Rv) | -17.4 km/s |
| Proper motion (μ) | RA: 61.39 mas/yr Dec.: -10.57 mas/yr |
| Parallax (π) | 21.03 ± 0.83 mas |
| Distance | 155 ± 6 ly (48 ± 2 pc) |
| Absolute magnitude (MV) | 4.74 |
| Details | |
| Mass | 3,1 M☉ |
| Radius | 2,1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Rotation | 127 Km/s 0,002295 Year |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
Kappa Boötis (κ Bootis, κ Boö) is the 4th magnitude star in the constellation Boötes. It was the 3rd member of an former asterism, Asellus by Johann Bayer, so called Aselles tertius[1] (Latin for "the third Ass", later Asellus Tertius. It is approximately 155 light years from theEarth.
Kappa Boötis is a binary star system viewable in small telescope, with components separated by an angular distance of 13.4 ′.
κ2 Boötis[edit]
Kappa Boötis | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 13m 29.0078s |
| Declination | +51° 47′ 23.874″ |
| Characteristics | |
| Spectral type | A8IV |
| U−B color index | 0.14 |
| B−V color index | 0.2 |
| R−I color index | 0.12 |
| Variable type | Delta Scuti variable |
| Astrometry | |
| Radial velocity (Rv) | -17.4 km/s |
| Proper motion (μ) | RA: 61.39 mas/yr Dec.: -10.57 mas/yr |
| Parallax (π) | 21.03 ± 0.83 mas |
| Distance | 155 ± 6 ly (48 ± 2 pc) |
| Absolute magnitude (MV) | 4.74 |
| Details | |
| Mass | 3,1 M☉ |
| Radius | 2,1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Rotation | 127 Km/s 0,002295 Year |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
κ2 Boötis is the brighter / following component of this star system. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.50 to +4.58 with a period of 1.83 hours. The companion star, κ¹ Boötis, has magnitude +6.58 and spectral class F1V.
κ1 Boötis[edit]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 13m 27.7s |
| Declination | +51° 47' 16" |
| Apparent magnitude (V) | +4.53, +6.62 |
| Distance | 155 ± 6 ly (48 ± 2 pc) |
| Spectral type | F1V |
| Database references | |
| SIMBAD | data |
Kappa1 Boötis is the dimmer / precceding component of this star system. It has apparent magnitude +4.54 and spectral class A8IV.
References[edit]
- ^ Allen, R. H., (1963). Star Names: Their Lore and Meaning (Rep. ed.). New York, NY: Dover Publications Inc. p. 105. ISBN 0486210790.
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