Gliese 693

Gliese 693
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pavo
Right ascension 17h 46m 32,4s
Declination −57° 19′ 09″
Apparent magnitude (V) +10.75
Characteristics
Spectral type M2.0V
Variable type Flare star
Astrometry
Radial velocity (Rv)115.00 km/s
Parallax (π)172.08 ± 2.22[1] mas
Distance19.0 ± 0.2 ly
(5.81 ± 0.07 pc)
Absolute magnitude (MV)+11.92
Details
Mass0.26 M☉
Radius0.30 R☉
Luminosity0.0015 L☉
Temperature3380 K
Other designations
UO 48[2][3]
Ci 20 1061[3]
LPM 655
L 205-128
LTT 7067
LFT 1372
NLTT 45375[4]
LHS 454[5]
GJ 693[6]
PLX 4040[7]
HIP 86990[1]
TYC 8737-2175-1[8]
DENIS J174634.7-571903
2MASS J17463427-5719081
Database references
SIMBADdata

Gliese 693 is a flare star of spectral type M2, located in constellation Pavo at 18.95 light-years from Earth.[1]

Distance

Gliese 693 distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Woolley et al. (1970) 170±5 5.88+0.18
−0.17		 19.2+0.6
−0.5		 181.5+5.5
−5.2		 [9]
Gliese & Jahreiß (1991) 165.5±8.4 6.04+0.32
−0.29		 19.7+1.1
−1		 186.4+10
−9		 [6]
van Altena et al. (1995) 166.7±7.9 6+0.3
−0.27		 19.6+1
−0.9		 185.1+9.2
−8.4		 [7]
Perryman et al. (1997) (Hipparcos) 172.08±2.22 5.81+0.08
−0.07		 18.95+0.25
−0.24		 179.3±2.3 [1]
Perryman et al. (1997) (Tycho) (absents) [8]
van Leeuwen (2007) 171.48±2.31 5.83±0.08 19.02+0.26
−0.25		 179.9+2.5
−2.4		 [10]
RECONS TOP100 (2012) 171.10±2.22[nb 1] 5.84+0.08
−0.07		 19.06+0.25
−0.24		 180.3+2.4
−2.3		 [11]

Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.

Space motion

Gliese 693 proper motion estimates

Source μ, mas/yr P. A., ° μRA, mas/yr μDEC, mas/yr Ref.
CiUO Volume 48 (1920)1771216.8−1060.9−1418.1[2]

The most accurate estimates are marked in bold. Italic are computed values, not italic are values, given in the sources.

References

  1. ↑ 1.0 1.1 1.2 1.3 Perryman et al. (1997). "HIP 86990". The Hipparcos and Tycho Catalogues.
  2. ↑ 2.0 2.1 "Proper Motions Found and Measured with the Blink-Microscope". Circular of the Union Observatory Johannesburg 48: 42–50. 1920. Bibcode:1920CiUO...48...42. Page 47 (see string 33)
  3. ↑ 3.0 3.1 Porter, J. G.; Yowell, E. J.; Smith, E. S. (1930). "A catalogue of 1474 stars with proper motion exceeding four-tenths year.". Publications of the Cincinnati Observatory 20: 1–32. Bibcode:1930PCinO..20....1P. Page 24 (Ci 20 1061).
  4. ↑ Luyten, Willem Jacob (1979). "NLTT 45375". NLTT Catalogue.
  5. ↑ Luyten, Willem Jacob (1979). "LHS 454". LHS Catalogue, 2nd Edition.
  6. ↑ 6.0 6.1 Gliese, W. and Jahreiß, H. (1991). "Gl 693". Preliminary Version of the Third Catalogue of Nearby Stars.
  7. ↑ 7.0 7.1 Van Altena W. F., Lee J. T., Hoffleit E. D. (1995). "GCTP 4040". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.).
  8. ↑ 8.0 8.1 Perryman et al. (1997). "HIP 86990". The Hipparcos and Tycho Catalogues.
  9. ↑ Woolley R.; Epps E. A.; Penston M. J.; Pocock S. B. (1970). "Woolley 693". Catalogue of stars within 25 parsecs of the Sun.
  10. ↑ van Leeuwen F. (2007). "HIP 86990". Validation of the new Hipparcos reduction.
  11. ↑ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012.

Notes

  1. ↑ Weighted parallax based on parallaxes from van Altena et al. (1995) and van Leeuwen (2007).