| 释义 |
- Discovery
- Orbit and classification
- Numbering and naming
- Physical characteristics
- References
- External links
{{DISPLAYTITLE:{{mp|(495603) 2015 AM|281}}}}{{Infobox planet
| minorplanet = yes
| name = {{mp|(495603) 2015 AM|281}}
| background = #C2E0FF
| image =
| image_size =
| caption =
| discovery_ref = [1][2]
| discoverer = Pan-STARRS 1
| discovery_site = Haleakala Obs.
| discovered = 13 March 2010
| mpc_name = (495603) {{mp|2015 AM|281}}
| alt_names = {{mp|2015 AM|281}}
| pronounced =
| named_after =
| mp_category = TNO
distant [1]
| orbit_ref =
| epoch = 27 April 2019 (JD 2458600.5)
| uncertainty = 3{{·}}1[1]
| observation_arc = 17.14 yr (6,261 d)
| aphelion = 68.916 AU
| perihelion = 41.357 AU
| semimajor = 55.137 AU
| eccentricity = 0.2499
| period = 409.42 yr (149,540 d)
| mean_anomaly = 335.33°
| mean_motion = {{Deg2DMS|0.0024|sup=ms}} / day
| inclination = 26.719°
| asc_node = 22.124°
| arg_peri = 158.18°
| mean_diameter = {{val|468|ul=km}} {{small|(est.)}}[5]
{{val|479|u=km}} {{small|(est.)}}[10]
| rotation =
| albedo = {{val|0.07}} {{small|(assumed)}}[10]
{{val|0.09}} {{small|(assumed)}}[5]
| spectral_type =
| abs_magnitude = 4.8[1]
}}{{mp|(495603) 2015 AM|281}}, provisional designation {{mp|2015 AM|281}}, is a resonant trans-Neptunian object and a probable dwarf planet candidate from the outermost region of the Solar System, approximately {{convert|470|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 13 March 2010, by astronomers with the Pan-STARRS survey at Haleakala Observatory, Hawaii, United States.[1] Discovery The body's observation arc begins with a precovery taken by the Sloan Digital Sky Survey in April 2000, nearly 10 years prior to its official discovery observation at Haleakala Observatory.[1] The discovery was announced in a Minor Planet Electronic Circular in July 2016, after additional observations by Pan-STARRS had been found (2010–2013), preceding the team's original observation from 11 January 2015, which led to the assignment of the object's first and only provisional designation, {{mp|2015 AM|281}}.[2] The observations were made with Pan-STARRS 1.8-meter Ritchey–Chrétien telescope, and B. Gibson, T. Goggia, N. Primak, A. Schultz, and M. Willman were the observers.[2] Orbit and classification {{mp|2015 AM|281}} is a resonant trans-Neptunian object in a 2:5 orbital resonance with Neptune, which means that it orbits the Sun exactly twice while Neptune orbits the Sun five times.[5] Several objects in this resonance with a period of 410 years have been found, including {{mpl-|84522|2002 TC|302}}.It orbits the Sun at a distance of 41.4–68.9 AU once every 409 years and 5 months (149,540 days; semi-major axis of 55.14 AU). Its orbit has an eccentricity of 0.25 and an inclination of 27° with respect to the ecliptic. Numbering and naming This minor planet was numbered by the Minor Planet Center on 9 June 2017 and received the number {{LoMP|495603|495603}} in the minor planet catalog ({{small|M.P.C. 105261}}).[23] As of 2018, it has not been named.[1] Physical characteristics According to the Johnston's archive and American astronomer Michael Brown, {{mp|2015 AM|281}} measures 468 and 479 kilometers in diameter based on an assumed albedo of 0.09 and 0.07, respectively.[5][10] On his website, Michael Brown lists this object as a "probable" dwarf planet (400–500 km) which is the category with the second lowest certainty in his 5-class taxonomic system.[10] As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. References 1. ^1 2 3 4 5 6 7 8 9 {{cite web |title = 495603 (2015 AM281) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=495603 |accessdate = 29 November 2018}}
2. ^1 2 3 {{cite web |title = MPEC 2016-O294: 2015 AM281 |work = Minor Planet Electronic Circular |date = 24 July 2016 |url = https://www.minorplanetcenter.net/mpec/K16/K16OT4.html |accessdate = 29 November 2018}}
3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 29 November 2018}}
4. ^1 2 3 4 5 {{cite web |title = List of Known Trans-Neptunian Objects |work = Johnston's Archive |date = 7 October 2018 |last = Johnston |first= Wm. Robert |url = http://www.johnstonsarchive.net/astro/tnoslist.html |accessdate = 29 November 2018}}
5. ^1 2 3 4 {{cite web |title = How many dwarf planets are there in the outer solar system? |publisher = California Institute of Technology |last = Brown |first= Michael E. |url = http://web.gps.caltech.edu/~mbrown/dps.html |accessdate = 29 November 2018}}
6. ^1 {{cite web |title = LCDB Data for (495603) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=495603%7C |accessdate = 29 November 2018}}
[1][2][3][4][5][6]}} External links - [https://www.minorplanetcenter.net/mpec/K16/K16OT4.html MPEC 2016-O294: 2015 AM281], Minor Planet Electronic Circular, 24 July 2016
- M.P.E.C. statistics for F51 – All MPECs
- [https://1.bp.blogspot.com/-9E1xWQv29rU/WWFvaorqS8I/AAAAAAAAO4U/XmJn1kCkY6oaK8dyOMi7jRYEoXtaz0hXgCLcBGAs/s1600/22-05.png Image of 2015 AM281], at San Marcello, May 2017 (blogpost)
- List of Known Trans-Neptunian Objects, Johnston's Archive
- The largest asteroids and outer solar system objects, Johnston's Archive, 2018
- [https://www.minorplanetcenter.net/iau/lists/t_centaurs.html List Of Centaurs and Scattered-Disk Objects], Minor Planet Center
- Discovery Circumstances: Numbered Minor Planets (495001)-(500000) – Minor Planet Center
- [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=495603 (495603) 2015 AM281], Small Bodies Data Ferret
- {{AstDys|495603}}
- {{JPL small body|id=2495603}}
{{Use dmy dates|date=November 2018}}{{Minor planets navigator | |number=495603 |PageName={{mp|(495603) 2015 AM|281}} | }}{{Small Solar System bodies}}{{Trans-Neptunian objects}}{{DEFAULTSORT:2015 AM281}} 5 : Trans-Neptunian objects|2:5 resonance|Discoveries by Pan-STARRS|Possible dwarf planets|Astronomical objects discovered in 2010 |