| 词条 | 1993 RP |
| 释义 |
| minorplanet = yes | name = 1993 RP | background = #C2E0FF | image = | image_size = | caption = | discovery_ref = [2] | discovered = 15 September 1993 {{nowrap|{{small|(discovery: first observed only)}}}} | discoverer = David C. Jewitt Jane X. Luu | discovery_site = Mauna Kea Obs. | mpc_name = 1993 RP | alt_names = | pronounced = | named_after = | mp_category = TNO {{·}}plutino [4] | orbit_ref = | epoch = 16 September 1993 (JD 2449246.5) | uncertainty = 9 | observation_arc = 2 days | aphelion = 43 ± 5500 AU | perihelion = 34 ± 450 AU | semimajor = 39 ± 5000 AU | eccentricity = 0.1 ± 124 | inclination = 2.5 ± 192° | asc_node = 192 ± 55° | dimensions = 70 km[4] | abs_magnitude = 9.0 }} 1993 RP might be a trans-Neptunian object, perhaps 70 kilometers in diameter, from the Kuiper belt in the outermost Solar System. However, the object has only a 2-day observation arc, making the data insufficient to provide virtually any idea of its true orbit. It was first observed on 15 September 1993, by astronomers at the Mauna Kea Observatory, one night after {{mpl|(385185) 1993 RO}} and the night before {{mpl|(15788) 1993 SB}}. On the discovery date of 15 September 1993 the object was estimated to have been {{Convert|34|AU|e9km|sigfig=2|abbr=unit|lk=on}} from Earth with an uncertainty in the object's distance of ±200 billion km. Johnston's website generically lists it as a plutino, like Pluto, which are objects that stay in a 2:3 orbital resonance with Neptune.[4] Briefly observed objects like 1993 RP generally have many possible orbits that fit the very small dataset. 1993 RP could be a TNO/centaur or a much closer main belt asteroid 100 times smaller in diameter. For example, {{mpl|2004 PR|107}} was once thought to be a potential dwarf planet, but is now known to be a small main belt asteroid. {{As of|2018}}, the uncertainty in the object's distance from the Sun is ±{{Convert|7|e12km|ly|abbr=unit|lk=on}}.See also
References1. ^1 {{cite web |title = 1993 RP |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1993+RP |accessdate = 29 July 2017}} [1][2]2. ^1 2 3 {{cite web |title = List of Known Trans-Neptunian Objects –1993 RP |work = Johnston's Archive |url = http://www.johnstonsarchive.net/astro/tnoslist.html |date = 22 July 2017 |accessdate = 29 July 2017}} }} External links
4 : Kuiper belt objects|Minor planet object articles (unnumbered)|Lost minor planets|Astronomical objects discovered in 1993 |
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