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.