| 词条 | 341520 Mors–Somnus | ||||||||
| 释义 |
| minorplanet = yes | name = 341520 Mors–Somnus | background = #C2E0FF | image = | image_size = | caption = | discovery_ref = | discovered = 14 October 2007 | discoverer = S. S. Sheppard C. Trujillo | discovery_site = Mauna Kea Obs. | mpc_name = (341520) Mors-Somnus | alt_names = {{mp|2007 TY|430}} | pronounced = | named_after = Mors and Somnus {{small|(Roman mythology)}}[2] | mp_category = TNO {{·}}Plutino [4] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 3 | observation_arc = 6.12 yr (2,235 days) | aphelion = 49.184 AU | perihelion = 28.839 AU | semimajor = 39.012 AU | eccentricity = 0.2607 | period = 243.67 yr (89,000 days) | mean_anomaly = 0.4680° | mean_motion = {{Deg2DMS|0.0040|sup=ms}} / day | inclination = 11.304° | asc_node = 196.75° | arg_peri = 205.32° | satellites = 1 [6] | dimensions = 102 km {{small|(derived)}}[6] 175.20 km {{small|(calculated)}}[8] {{nowrap|<60 km {{small|(each component)}}[4]}} | density = >0.5 g/cm3[4] | rotation = {{val|9.28|0.05}} h[11] | albedo = 0.10 {{small|(assumed)}}[8] {{val|0.23}}[4] | spectral_type = B–V = {{val|1.290|0.014}}[4] V–R = {{val|0.740|0.010}}[4] V–I = {{val|1.370|0.014}}[4] C [8] | abs_magnitude = 6.9[8] {{val|6.94|0.02}}[4] }} {{mp|341520 Mors–Somnus}}, provisional designation {{mp|2007 TY|430}}, is a trans-Neptunian object and binary system that resides in the Kuiper belt. It is classified as a plutino and measures approximately 100 kilometers in diameter. It was discovered on 14 October 2007, by American astronomers Scott Sheppard and Chad Trujillo with the Subaru telescope at Mauna Kea Observatories in Hawaii, United States. It was later named after the twins Mors and Somnus from Roman mythology.[2] Orbit and binarityMors–Somnus is a small double plutino occupying the 3:2 mean motion resonance with Neptune.[4] The object is a wide optically resolved binary with the following orbital parameters:
The components has almost equal size. Physical propertiesThe total mass of the system is {{nowrap|7.90 ± 0.21{{e|17}} kg}}. For a realistic minimal density of 0.5 g/cm3 the albedo is >0.17 and the size of the components is <60 km.[4] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.1 and calculates a diameter of 175.20 kilometers based on an absolute magnitude of 6.9.[8] Mors–Somnus has an ultra-red spectrum in the visible and near-infrared parts of the spectrum. The colors of two components are indistinguishable from each other.[4] It demonstrates a double-peaked light curve with the period of about 9.28 hours and amplitude of 0.24. This indicates that either primary of secondary has an elongated shape and rotates non-synchronuosly.[11]EvolutionThe Mors–Somnus system is likely to be an escaped cold classical Kuiper Belt object.[4] NamingThe minor planet was named after the mythological twin Roman gods of death (Mors) and sleep (Somnus).[2] The approved naming citation was published by the Minor Planet Center on 2 June 2015 ({{small|M.P.C. 94392}}).[30] References1. ^1 2 3 {{cite web |title = 341520 Mors-Somnus (2007 TY430) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=341520 |accessdate = 5 July 2017}} [1][2][3][4][5][6]2. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 5 July 2017}} 3. ^1 2 {{cite web |title = (341520) Mors-Somnus |date = 6 June 2015 |author = Wm. Robert Johnston |publisher = Asteroids with Satellites Database—Johnston's Archive |url = http://www.johnstonsarchive.net/astro/astmoons/am-341520.html |accessdate = 5 July 2017}} 4. ^1 2 3 4 5 {{cite web |title = LCDB Data for (341520) Mors–Somnus |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=341520%7CMors–Somnus |accessdate = 5 July 2017}} 5. ^1 2 {{Cite journal |first1 = A. |last1 = Thirouin |first2 = K. S. |last2 = Noll |first3 = J. L. |last3 = Ortiz |first4 = N. |last4 = Morales |date = September 2014 |title = Rotational properties of the binary and non-binary populations in the trans-Neptunian belt |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014A&A...569A...3T |journal = Astronomy and Astrophysics |volume = 569 |page = 20 |bibcode = 2014A&A...569A...3T |doi = 10.1051/0004-6361/201423567 |access-date= 5 July 2017|arxiv = 1407.1214 }} 6. ^1 2 3 4 5 6 7 8 9 10 11 12 13 {{Cite journal |first1 = Scott S. |last1 = Sheppard |first2 = Darin |last2 = Ragozzine |first3 = Chadwick |last3 = Trujillo |date = March 2012 |title = 2007 TY430: A Cold Classical Kuiper Belt Type Binary in the Plutino Population |url = https://arxiv.org/pdf/1112.2708.pdf |journal = The Astronomical Journal |volume = 143 |issue = 3 |page = 13 |bibcode = 2012AJ....143...58S |doi = 10.1088/0004-6256/143/3/58 |arxiv = 1112.2708 |access-date= 5 July 2017}} }} External links
6 : Plutinos|Discoveries by Scott S. Sheppard|Discoveries by Chad Trujillo|Named minor planets|Binary trans-Neptunian objects|Astronomical objects discovered in 2007 |
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