User:Procyon117/sandbox
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 06h 49m 57.57s[1] |
| Declination | +60° 20′ 14.53″[1] |
| Apparent magnitude (V) | 8.58[2] |
| Characteristics | |
| Evolutionary stage | Main sequence star |
| Spectral type | K3V[3] |
| Apparent magnitude (J) | 6.33±0.02[2] |
| Apparent magnitude (H) | 5.73±0.02[2] |
| Apparent magnitude (K) | 5.61±0.02[2] |
| B−V color index | 1.21 |
| Astrometry | |
| Radial velocity (Rv) | −52.061±0.0020[3] km/s |
| Proper motion (μ) | RA: 253.401±0.020 mas/yr[3] Dec.: 410.798±0.017 mas/yr[3] |
| Parallax (π) | 59.393 ± 0.025 mas[2] |
| Distance | 54.91 ± 0.02 ly (16.837 ± 0.007 pc) |
| Details[2] | |
| Mass | 0.686+0.020 −0.013 M☉ |
| Radius | 0.679±0.004 R☉ |
| Temperature | 4593±60 K |
| Metallicity [Fe/H] | −0.21±0.03 dex |
| Rotational velocity (v sin i) | <2 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 48948 is a K-type main-sequence star (K3V) located in the constellation Lynx, approximately 55 light years away, based on a parallax of 59.393 mas. At an apparent magnitude of 8.58, it is too faint to be seen with the naked eye. Its age has been estimated at around 11.5 billion years.[2]
Planetary system
[edit]In 2024, three planets were discovered orbiting HD 48948 via radial velocity using the HARPS-N spectrograph, with orbital periods of 7.3, 38 and 151 days, respectively,[4] derived from 189 measurements over a 9.5-year period from 6 October 2013 to 16 April 2023. Of the three planets, the outermost planet, HD 48948 d, a super-Earth weighing 10.59±1.00 Earth masses, is located within the habitable zone, making it the closest super-Earth that has the possibility of sustaining life,[5] and is one of only three planets orbiting within the habitable zone of an F-, G- or K-type star, alongside HIP 38594 b and HD 216520 c.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >4.88±0.21 M🜨 | 0.0652±0.0005 | 7.34013±0.00040 | 0.078+0.058 −0.050 |
— | — |
| c | >7.27±0.70 M🜨 | 0.1951±0.0016 | 37.920+0.026 −0.024 |
0.22+0.10 −0.11 |
— | — |
| d | >10.59±1.00 M🜨 | 0.4894±0.0042 | 150.95+0.45 −0.41 |
0.12+0.12 −0.08 |
— | — |
| Designations | |
|---|---|
| 2015 XF261 | |
| Orbital characteristics[1] | |
| Epoch 2024-Mar-31 (JD 2460400.5) | |
| Observation arc | 2,991 days |
| Aphelion | 1.305 AU |
| Perihelion | 0.674 AU |
| 0.990 AU | |
| Eccentricity | 0.319 AU |
| 0.985 years | |
| 245.662° | |
| Inclination | 0.794° |
| 209.839° | |
| 100.893° | |
| Physical characteristics[1] | |
| 25.25 | |
2015 XF261 is a Near-Earth Aten asteroid with an estimated diameter of between 16 m (52 ft) and 69 m (226 ft),[6] with next closest approach occurring on 21 February 2025 at 16:25 UTC[1] and closest approach of the 21st century occurring on 11 April 2090 at a distance of 381,649 km (0.00255 au). It completes one orbit around the Sun every 360 days.[7]
2029 mission
[edit]2015 XF261 is the target for an asteroid-deflecting mission planned by China in 2029, launching in 2027, two years after its previous launch target of 2025. Its original target was 2019 VL5. The spacecraft is planned to be launched on a Long March 3B in 2027, making a flyby of Venus before arriving at the asteroid in early 2029, and colliding with the asteroid in April 2029 at an estimated speed of 10 km/s (6.2 mi/s).[8]
References
[edit]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. Cite error: The named reference ":0" was defined multiple times with different content (see the help page).
- ^ a b c d e f g h i Dalal, S.; et al. (37) (24 June 2024). "Trio of super-Earth candidates orbiting K-dwarf HD 48948: a new habitable zone candidate". Monthly Notices of the Royal Astronomical Society. 531 (4): 4464–4481. doi:10.1093/mnras/stae1367. Retrieved 9 July 2024.
- ^ a b c "HD 48948". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 July 2024.
- ^ Cowing, Keith (26 June 2024). "Three Potential Super-Earths Discovered Around Nearby Star HD 48 948". Astrobiology. Retrieved 11 July 2024.
- ^ Luntz, Stephen (25 June 2024). "Nearest Super-Earth In A Habitable Zone Orbit Announced". IFLScience. Retrieved 11 July 2024.
- ^ "Object/Trajectory Details 2015 XF261". cneos.jpl.nasa.gov. Retrieved 23 July 2024.
- ^ "2015 XF261". spacereference.org. Retrieved 23 July 2024.
- ^ Foust, Jeff (16 July 2024). "China reschedules planetary defense mission for 2027 launch". spacenews.com. Retrieved 23 July 2024.