Astronomy:2017 SN16
| Discovery[2] | |
|---|---|
| Discovered by | A. R. Gibbs[1] Mount Lemmon Srvy. |
| Discovery site | Mount Lemmon Obs. |
| Discovery date | 24 September 2017 (first observed only) |
| Designations | |
| 2017 SN16 | |
| Minor planet category | NEO · Apollo[2][3] |
| Orbital characteristics[3] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 1 | |
| Observation arc | 1.07 yr (391 d) |
| |{{{apsis}}}|helion}} | 1.1640 AU |
| |{{{apsis}}}|helion}} | 0.8683 AU |
| 1.0161 AU | |
| Eccentricity | 0.1455 |
| Orbital period | 1.02 yr (374 d) |
| Mean anomaly | 77.918° |
| Mean motion | 0° 57m 43.92s / day |
| Inclination | 13.383° |
| Longitude of ascending node | 2.7324° |
| 136.98° | |
| Earth MOID | 0.0928 AU (36.2 LD) |
| Physical characteristics | |
| Mean diameter | 58 m (est. at 0.25)[4] 130 m (est. at 0.05)[4] |
| Absolute magnitude (H) | 23.3[2][3] |
2017 SN16, is a sub-kilometer asteroid, classified as a near-Earth object of the Apollo group, approximately 90 meters (300 feet) in diameter. The object was first observed on 24 September 2017, by cometary discoverer Alex Gibbs with the Mount Lemmon Survey at Mount Lemmon Observatory, Arizona, in the United States.[2] It forms an asteroid pair with 2018 RY7 and is currently trapped in a 3:5 mean motion resonance with Venus.[1]
Orbit and classification
2017 SN16 is a member of the Apollo asteroids, which cross the orbit of Earth. Apollo's are the largest group of near-Earth objects with nearly 10 thousand known objects.
The object orbits the Sun at a distance of 0.87–1.17 AU once every 374 days (semi-major axis of 1.02 AU). Its orbit has an eccentricity of 0.15 and an inclination of 13° with respect to the ecliptic.[3] It has a minimum orbital intersection distance with Earth of 13,900,000 km (0.0928 AU), which translates into 36.2 lunar distances (LD).[3] The body's observation arc begins with its first observation at Mount Lemmon in September 2017.[2]
Asteroid pair
2017 SN16 is currently trapped in a 3:5 mean motion resonance with Venus and follows an orbit very similar to that of 2018 RY7. They form a pair of asteroids which at some point in the past had very small relative velocities (in the order of only a few meters per second), and may represent a former binary system where the two bodies became gravitationally unbound – by a YORP-induced fission, for example – and subsequently followed separate orbits around the Sun. Other pairs may have been formed from collisional breakup of a parent body.[1] Both 2017 SN16 and 2018 RY7 shows the highest observed level of dynamical coherence among the population of near-Earth objects.
Numbering and naming
This minor planet has neither been numbered nor named.[2]
Physical characteristics
2017 SN16 has an absolute magnitude of 23.3 which gives a calculated mean diameter between 58 and 130 meters for an assumed geometric albedo of 0.25 and 0.05, respectively.[4]
References
- ↑ 1.0 1.1 1.2 de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (11 February 2019). "Dancing with Venus in the shadow of the Earth: a pair of genetically related near-Earth asteroids trapped in a mean-motion resonance". Monthly Notices of the Royal Astronomical Society: Letters 483 (1): L37–L41. doi:10.1093/mnrasl/sly214. Bibcode: 2019MNRAS.483L..37D. https://academic.oup.com/mnrasl/article-abstract/483/1/L37/5184474. Retrieved 4 December 2018.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "2017 SN16". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?object_id=2017+SN16. Retrieved 13 November 2018.
- ↑ 3.0 3.1 3.2 3.3 3.4 "JPL Small-Body Database Browser: (2017 SN16)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3781896;cad=1. Retrieved 13 November 2018.
- ↑ 4.0 4.1 4.2 "Asteroid Size Estimator". CNEOS NASA/JPL. https://cneos.jpl.nasa.gov/tools/ast_size_est.html. Retrieved 13 November 2018.
External links
- MPEC 2017-S186: 2017 SN16, Minor Planet Electronic Circular
- MPEC 2018-R38 : 2017 SN16, Minor Planet Electronic Circular
- List Of Apollo Minor Planets (by designation), Minor Planet Center
- Asteroid pairs and clusters, Johnston's Archive
- 2017 SN16 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- 2017 SN16 at ESA–space situational awareness
- 2017 SN16 at the JPL Small-Body Database
 |  |
