NGTS-3

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Coordinates: Sky map 06h 17m 46.75s, −35° 42′ 23.05″

NGTS-3
Observation data
Epoch J2000      Equinox J2000
Constellation Columba
Right ascension 06h 17m 46.75s[1]
Declination −35° 42′ 23.05″[1]
Apparent magnitude (V) 14.67±0.01[2]
Characteristics
Spectral type G6 V + K1 V
B−V color index +0.77[2]
R−I color index +0.36[2]
Astrometry
Radial velocity (Rv)8.57±0.05[3] km/s
Proper motion (μ) RA: -8.838[1] mas/yr
Dec.: +8.771[1] mas/yr
Parallax (π)1.3153 ± 0.0193[1] mas
Distance2,480 ± 40 ly
(760 ± 10 pc)
Details[3]
A
Mass1.02±0.09 M☉
Radius0.93±0.23 R☉
Luminosity0.72±0.03[1] L☉
Surface gravity (log g)4.45[4] cgs
Temperature5,600±150 K
Metallicity [Fe/H]0.12±0.15 dex
Rotational velocity (v sin i)1.0±0.7 km/s
Other designations
Gaia DR2 2885350546895266432
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

NGTS-3 is a star located in the southern constellation Columba. With an apparent magnitude of 14.67, it requires a powerful telescope to observe. However, NGTS-3 is actually an unresolved spectroscopic binary. The system is located 2,480 light years away based on parallax, but is drifting away with a radial velocity of 8.57 km/s.

Properties[]

The system contains two main sequence stars of classes G6 and K1 respectively; only the primary properties is known. NGTS-3A has a similar mass to our Sun, but is 7% smaller than the latter. It radiates at 72% the Sun's luminosity from its photosphere at an effective temperature of 5,600 K, which gives it a typical yellow hue of a G-type star.

Planetary System[]

In 2018, the NGTS survey discovered an inflated hot Jupiter orbiting NGTS-3A despite the components being visually unresolved.[3]

The NGTS-3 planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
Ab 2.38 ± 0.26 MJ 0.023+0.007
−0.005 		1.6753728 ± 0.0000030 0? 89.56+0.31
−0.48° 		1.48 ± 0.37 RJ

References[]

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (February 2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal. 145: 44. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256.
  3. ^ a b c d Günther, Maximilian N.; et al. (August 2018). "Unmasking the hidden NGTS-3Ab: a hot Jupiter in an unresolved binary system". Monthly Notices of the Royal Astronomical Society. 478: 4720–4737. doi:10.1093/mnras/sty1193. ISSN 0035-8711.
  4. ^ Stassun, Keivan G.; et al. (October 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158: 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
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