13 Boötis

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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
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]
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
Mass 0.8-2.6 [3] M
Radius 71 R
Luminosity ≈680 L
Temperature ≈3,500 K
Companion CCDM 14082+4927 B
Semi-major axis (a) 79.7"
Inclination (i) 274°
Other designations
CF Boötis, HR 5300, HD 123782, BD+50°2047, FK5 3124, HIP 69068, SAO 44905, GC 19095, BDS 6736, CCDM 14082+4927.
Database references
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[clarification needed]: 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?[edit]

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.

The 13 Boötis planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b (unconfirmed) ≥30 MJ ≥1.25 494 0.21


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


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752free to read. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ 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. 
  3. ^ 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. 
  4. ^ 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. 

External links[edit]