NGTS-3
Topic: Astronomy
From HandWiki - Reading time: 2 min
Coordinates: 
06h 17m 46.75s, −35° 42′ 23.05″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 2,480 ± 40 ly (760 ± 10 pc) |
| Details[3] | |
| A | |
| Mass | 1.02±0.09 M☉ |
| Radius | 0.93±0.23 R☉ |
| Luminosity | 0.72±0.03[1] L☉ |
| Surface gravity (log g) | 4.45[4] cgs |
| Temperature | 5,600±150 K |
| Metallicity [Fe/H] | 0.12±0.15 dex |
| Rotational velocity (v sin i) | 1.0±0.7 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| 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 the Sun, but is 7% smaller. 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]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 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 (2): 44. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. Bibcode: 2013AJ....145...44Z. https://ui.adsabs.harvard.edu/abs/2013AJ....145...44Z/abstract.
- ↑ 3.0 3.1 3.2 3.3 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 (4): 4720–4737. doi:10.1093/mnras/sty1193. ISSN 0035-8711. Bibcode: 2018MNRAS.478.4720G. https://ui.adsabs.harvard.edu/abs/2018MNRAS.478.4720G/abstract.
- ↑ Stassun, Keivan G. et al. (October 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
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