EPIC 204278916

EPIC 204278916
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Scorpius
Right ascension 16h 02m 07.576s[1]
Declination −22° 57′ 46.89″[1]
Characteristics
Evolutionary stage Pre-main-sequence
Spectral type M1[2]
Apparent magnitude (R) 13.7[3]
J−H color index 0.712
J−K color index 1.033
Astrometry
Proper motion (μ) RA: -12.267±0.123 mas/yr
Dec.: -24.955±0.069 mas/yr
Parallax (π)7.1285 ± 0.0633 mas[4]
Distance458 ± 4 ly
(140 ± 1 pc)
Details
Mass0.5[5] M☉
Radius0.97[5] R☉
Luminosity (bolometric)0.15[3] L☉
Temperature3,673[3] K
Age≈5[5] Myr
Other designations
2MASS J16020757-2257467, UCAC2 22721863, USNO-B1.0 0670-00406583, Gaia DR2 6243130106031671168
Database references
SIMBADdata

EPIC 204278916 is a pre-main-sequence star, about five million years old with a spectral type of M1, implying a red dwarf. It is part of the Upper Scorpius sub-group of the Scorpius–Centaurus association, and is in the constellation Scorpius. The star is approximately the size of the Sun at 0.97 R☉, but is only half its mass (0.50 M☉) and a fraction of its luminosity (0.15 L☉).[5]

This stellar object was first characterized by the 2nd USNO CCD Astrograph Catalog and the Two Micron All-Sky Survey,[1][6] and was further studied during the Kepler space telescope's extended K2 mission Campaign 2 between 23 August and 13 November 2014.

  1. ^ a b c Zacharias, N.; Urban, S. E.; Zacharias, M. I.; et al. (2003). "VizieR Online Data Catalog: The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". CDS/ADC Collection of Electronic Catalogues (1289). Bibcode:2003yCat.1289....0Z.
  2. ^ Bouy, H.; Martín, Eduardo L. (September 2009). "Proper motions of cool and ultracool candidate members in the Upper Scorpius OB association". Astronomy and Astrophysics. 504 (3): 981–990. arXiv:0907.0149. Bibcode:2009A&A...504..981B. doi:10.1051/0004-6361/200811088. S2CID 14150392.
  3. ^ a b c Preibisch, Thomas; Brown, Anthony G. A.; Bridges, Terry; Guenther, Eike; Zinnecker, Hans (July 2002). "Exploring the Full Stellar Population of the Upper Scorpius OB Association". The Astronomical Journal. 124 (1): 404–416. Bibcode:2002AJ....124..404P. doi:10.1086/341174.
  4. ^ Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  5. ^ a b c d Scaringi, S.; Manara, C. F.; Barenfeld, S. A.; Groot, P. J.; Isella, A.; et al. (August 2016). "The peculiar dipping events in the disk-bearing young-stellar object EPIC 204278916". Monthly Notices of the Royal Astronomical Society. 463 (2). stw2155. arXiv:1608.07291. Bibcode:2016MNRAS.463.2265S. doi:10.1093/mnras/stw2155. S2CID 8188464.
  6. ^ Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.