13 Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 08m 17.303s[1] |
| Declination | +49° 27′ 29.40″[1] |
| Apparent magnitude (V) | 5.274 |
| Characteristics | |
| Spectral type | M1.5III |
| U−B color index | 1.65 |
| B−V color index | 1.92 |
| R−I color index | 1.12 |
| Variable type | Lb[2] |
| Astrometry | |
| Radial velocity (Rv) | -13.4 km/s |
| Proper motion (μ) | RA: -59.57 ± 0.26[1] mas/yr Dec.: 60.42 ± 0.23[1] mas/yr |
| Parallax (π) | 5.94 ± 0.25[1] mas |
| Distance | 550 ± 20 ly (168 ± 7 pc) |
| Absolute magnitude (MV) | 6.944 |
| Details | |
| Mass | 0.8-2.6 [3] M☉ |
| Radius | 71 R☉ |
| Luminosity | ≈680 L☉ |
| Temperature | ≈3,500 K |
| Orbit | |
| Companion | CCDM 14082+4927 B H112 |
| Semi-major axis (a) | 79.7" |
| Inclination (i) | 274° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
13 Boötis or CF Boötis is a variable star in the constellation Boötes. It is approximately 550 light years from Earth.[1] That means if you traveled at the speed of light, it would take 550 years to arrive at 13 Boötis.
13 Boötis is a M-type red giant with a mean apparent magnitude of +5.26. It is classified as an irregular variable star and its brightness varies from magnitude +5.2 to +5.3.
13 Boötis (H VI 112) RA: 14h 08m Dec: +49° 27′ Magnitudes: 5.5, 11.0 Separation: 75.5″ Position Angle: 271° (WDS 2005) Distance: 557 Light Years
If you draw a line from Lambda (λ) Boötis to Kappa (κ) Boötis, you’ll find 13 Boötis lying at the midway point and about an arcminute west of it
A planetary system?
Back in 1991 Duquennoy & Mayor [4] reported the possible presence of a low-mass object (of likely substellar nature) orbiting the red giant 13 Bootis. They set a minimum mass of 30 times that of Jupiter (likely a brown dwarf) and estimated an orbital period of 1.35 years. So far there has been no confirmation about the presence a substellar object.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | ≥30 MJ | ≥1.25 | 494 | 0.21 | — | — |
Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| BDS 6736 B (BD+50 2047B) | 14h 08m 09.4212s | +49° 27' 30.665 | 10.9 | Simbad |
References
- 1 2 3 4 5 6 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. Vizier catalog entry - ↑ 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.
- ↑ Alvarez & Menessier (1997). "Determination of Miras temperatures from TiO and VO bands. Estimates of distances.". Astronomy and Astrophysics. 317: 761–768. Bibcode:1997A&A...317..761A.
- ↑ Duquennoy & Mayor (1991). "Multiplicity among solar-type stars in the solar neighbourhood. II - Distribution of the orbital elements in an unbiased sample". Astronomy and Astrophysics. 248 (2): 485–524. Bibcode:1991A&A...248..485D.
