Ross 47

Ross 47
Observation data
Epoch J1950.0      Equinox J1950.0
Constellation Orion
Right ascension 5h 39m 14s
Declination +12° 29′ 18″
Apparent magnitude (V) +11.56
Characteristics
Spectral type M4.0Vn
U−B color index +14.264
B−V color index +13.130
Variable type BY Dra
Astrometry
Radial velocity (Rv)105.85 km/s
Parallax (π)171.72 ± 1.06[1] mas
Distance19.0 ± 0.1 ly
(5.82 ± 0.04 pc)
Absolute magnitude (MV)+12.75
Details
Mass0.35 M☉
Radius118.320 km R☉
Luminosity0.00069 L☉
Other designations
AC +12°1800-213
V1352 Ori
Ross 47[2]
Ci 20 344[3]
LTT 11704
LFT 425
G 102-22
NLTT 15489[4]
LHS 31[5]
GJ 213[6]
PLX 1305[7]
GSC 00722-00455
HIP 26857[8]
TYC 722-455-1[9]
2MASS J05420897+1229252
Database references
SIMBADdata

Ross 47 is a flare star of spectral type M4, located in constellation Orion at 18.99 light-years from Earth.[1]

Distance

Ross 47 distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Woolley et al. (1970) 166±4 6.02+0.15
−0.14		 19.6±0.5 185.9+4.6
−4.4		 [10]
Gliese & Jahreiß (1991) 166.5±3.9 6.01±0.14 19.6+0.5
−0.4		 185.3+4.4
−4.2		 [6]
van Altena et al. (1995) 166.2±5.1 6.02+0.19
−0.18		 19.6±0.6 185.7+5.9
−5.5		 [7]
Perryman et al. (1997) (Hipparcos) 172.78±3.88 5.79±0.13 18.9±0.4 178.6+4.1
−3.9		 [8]
Perryman et al. (1997) (Tycho) (absents) [9]
van Leeuwen (2007) 171.55±3.99 5.83+0.14
−0.13		 19+0.5
−0.4		 179.9+4.3
−4.1		 [11]
Gatewood (2008) 171.72±1.06 5.82±0.04 18.99±0.12 179.7±1.1 [1]
RECONS TOP100 (2012) 171.50±1.00[nb 1] 5.83±0.03 19.02±0.11 179.9+1.1
−1		 [12]
Dittmann et al. (2014) 164.00±3.30 6.1+0.13
−0.12		 19.9±0.4 188.2+3.9
−3.7		 [13]

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

Space motion

Ross 47 proper motion estimates

Source μ, mas/yr P. A., ° μRA, mas/yr μDEC, mas/yr Ref.
Ross (1925)25501262063−1498.9[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 Gatewood, George (2008). "Astrometric Studies of Aldebaran, Arcturus, Vega, the Hyades, and Other Regions". The Astronomical Journal 136 (1): 452–460. Bibcode:2008AJ....136..452G. doi:10.1088/0004-6256/136/1/452.
  2. ↑ 2.0 2.1 Ross, Frank E. (1925). "New proper-motion stars, (first list)". Astronomical Journal 36 (852-853): 96–99. Bibcode:1925AJ.....36...96R. doi:10.1086/104687. Page 97 (Ross 47)
  3. ↑ 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 9 (Ci 20 344).
  4. ↑ Luyten, Willem Jacob (1979). "NLTT 15489". NLTT Catalogue.
  5. ↑ Luyten, Willem Jacob (1979). "LHS 31". LHS Catalogue, 2nd Edition.
  6. ↑ 6.0 6.1 Gliese, W. and Jahreiß, H. (1991). "Gl 213". 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 1305". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.).
  8. ↑ 8.0 8.1 Perryman et al. (1997). "HIP 26857". The Hipparcos and Tycho Catalogues.
  9. ↑ 9.0 9.1 Perryman et al. (1997). "HIP 26857". The Hipparcos and Tycho Catalogues.
  10. ↑ Woolley R.; Epps E. A.; Penston M. J.; Pocock S. B. (1970). "Woolley 213". Catalogue of stars within 25 parsecs of the Sun.
  11. ↑ van Leeuwen F. (2007). "HIP 26857". Validation of the new Hipparcos reduction.
  12. ↑ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012.
  13. ↑ Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs". The Astrophysical Journal 784 (2): 156. arXiv:1312.3241. Bibcode:2014ApJ...784..156D. doi:10.1088/0004-637X/784/2/156.

Notes

  1. ↑ Weighted parallax based on parallaxes from van Altena et al. (1995), van Leeuwen (2007) and Gatewood (2008).