Extrasolar planet
K2-72c| Discovery |
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| Discovery date | July 18, 2016 |
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| Detection method | Transit |
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| Orbital characteristics |
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| Semi-major axis | 0.0722 ± 0.0091 AU (10,800,000 ± 1,360,000 km)[1] |
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| Orbital period (sidereal) | 15.1871±0.0032[1] d |
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| Star | K2-72[1] |
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| Physical characteristics |
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| Mean radius | 0.860±0.220 [1] R🜨 |
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K2-72c is a small exoplanet orbiting around the red dwarf star K2-72 approximately 227.7 light-years away. It is located in the inner edge of the habitable zone.[2] K2-72c completes an orbit in 15.2 days, and it has a radius of only 86% of that of the Earth.
Host star
[edit] Main article: K2-72
The planet orbits a (M-type) red dwarf star named K2-72, orbited by a total of four planets, of which K2-72e has the longest orbital period. The star has a mass of 0.27 M☉ and a radius of 0.33 R☉. It has a temperature of 3360 K and its age is unknown. In comparison, the Sun is 4.6 billion years old[3] and has a surface temperature of 5778 K.[4]
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 15.309. Therefore, it is too dim to be seen with the naked eye and can only be observed with a telescope.
Discovery
[edit] The planet, along with the other three planets in the K2-72 system, were announced in mid-July 2016 as part of the new results from the second mission of the Kepler spacecraft.
References
[edit] - ^ a b c d "K2-72c CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2016-07-18.
- ^ Mike Wall (18 July 2016). "2 Newfound Alien Planets May Be Capable of Supporting Life". Space.com. Retrieved 19 July 2016.
- ^ Cain, Fraser (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 19 February 2011.
- ^ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 19 February 2011.
| 2016 in space |
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Space probe launches  | - Hitomi (X-ray observatory; Feb 2016)
- ExoMars Trace Gas Orbiter (Mars orbiter; Mar 2016)
- OSIRIS-REx (asteroid sample-return mission; Sep 2016)
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| Impact events | |
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| Selected NEOs | - Asteroid close approaches
- (85990) 1999 JV6
- 1994 WR12
- 2013 TX68
- 2016 EU85
- 469219 Kamoʻoalewa
- 2016 PQ
- (164121) 2003 YT1
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| Exoplanets | - 38 Virginis b
- atmospheric composition of 55 Cancri e
- BD+20 594b
- Gliese 536 b
- HD 19467 b
- HD 131399 Ab (retracted in 2022)
- HD 164922 c
- HIP 41378
- K2-33b
- K2-332 b
- K2-72
- KELT-9b
- KELT-11b
- Kepler-20g
- Kepler-56d
- Kepler-737b
- Kepler-1229b
- Kepler-1520b
- Kepler-1625b
- Kepler-1638b
- Kepler-1647b
- OGLE-2007-BLG-349(AB)b
- OGLE-2012-BLG-0950Lb
- Proxima Centauri b
- Pr0211 c
- Qatar-3b
- Qatar-4b
- Qatar-5b
- TRAPPIST-1
- TW Hydrae b
- V830 Tauri b
- 2MASS J11193254–1137466 AB
- 2MASS J2126–8140 as planet
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| Discoveries | - GW150914 (announced)
- IDCS 1426
- Planet Nine (hypothesized)
- GN-z11
- SDSS J1240+6710
- Crater 2
- 1 moon of Makemake (S/2015 (136472) 1)
- GW151226 (announced)
- (523794) 2015 RR245 (announced)
- 1 moon of Gonggong (Xiangliu)
- BOSS Great Wall
- GRB 160625B
- 471325 Taowu (announced)
- 2014 UZ224 (announced)
- WISE J080822.18-644357.3
- Virgo I
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| Novae | - ASASSN-15lh
- SN 2016aps
- ASASSN-16kt
- ASASSN-16ma
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| Comets | - 252P/LINEAR
- 460P/PanSTARRS
- 53P/Van Biesbroeck
- C/2016 R2 (PANSTARRS)
- 81P/Wild
- 9P/Tempel
- 144P/Kushida
- 43P/Wolf–Harrington
- 45P/Honda–Mrkos–Pajdušáková
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| Space exploration | - Juno (entered Jupiter orbit; Jul 2016)
- Rosetta / Philae (end of mission to comet 67P; Sep 2016)
- Schiaparelli EDM (Mars lander; Oct 2016)
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 Outer space portal- Category:2015 in outer space — Category:2016 in outer space — Category:2017 in outer space
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| Constellation of Aquarius |
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- Aquarius in Chinese astronomy
- Aquarius Stream
- List of stars in Aquarius
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| Stars | |
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| Exoplanets | - ψ1 Aquarii b
- Gliese 849 b
- Gliese 876 b
- c
- d
- e
- HD 206610 b (Naron)
- HD 210277 b
- HD 212771 b (Victoriapeak)
- HD 221416 b
- HD 222582 b
- K2-66b
- K2-72b
- c
- d
- e
- K2-138b
- TRAPPIST-1b
- c
- d
- e
- f
- g
- h
- WASP-6b (Boinayel)
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| Star clusters | - Messier 2
- Messier 72
- Messier 73
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| Nebulae | - Helix Nebula
- Lyman-alpha blob 1
- Saturn Nebula
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| Galaxies | | NGC | - 6962
- 6975
- 7001
- 7010
- 7047
- 7051
- 7065
- 7069
- 7077
- 7081
- 7171
- 7184
- 7222
- 7252
- 7257
- 7300
- 7301
- 7302
- 7364
- 7393
- 7492
- 7585
- 7592
- 7600
- 7606
- 7721
- 7723
- 7727
- 7759
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| Other | - 3C 446
- Aquarius Dwarf
- ESO 603-G21
- MACS 2129-1
- MR 2251−178
- PGC 1228197
- PHL 293B
- PJ352–15
- PKS 2131−021
- PKS 2134+004
- PKS 2215+020
- SDSS J211852.96−073227.5
- SMM J2135−0102
- South America Galaxy
- WISE J224607.57−052635.0
- J2345−0449
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| Galaxy clusters | - Abell 2597
- RXC J2211.7−0350
- SSA22 Protocluster
- XMMXCS 2215−1738
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