| 词条 | (85770) 1998 UP1 |
| 释义 |
|minorplanet = yes |name = {{mp|(85770) 1998 UP|1}} |symbol = |background = #FFC2E0 |image = |caption = |discovery_ref = [2] |discoverer = LINEAR |discovered = 18 October 1998 |discovery_site = Lincoln Lab's ETS |mpc_name = |mp_category = NEO{{·}}Aten |alt_names = {{mp|1998 UP|1}} |orbit_ref = [2] |epoch = 13 January 2016 (JD 2457400.5) |aphelion = {{Convert|1.3427|AU|Gm|abbr=on|lk=on}} |perihelion = {{Convert|0.65377|AU|Gm|abbr=on}} |semimajor = {{Convert|0.99826|AU|Gm|abbr=on}} |eccentricity = 0.34509 |period = 1.00 yr (364.30 d) |inclination = 33.180° |asc_node = 18.357° |mean_anomaly = 193.86° |arg_peri = 234.27° |satellites = |dimensions = 210–470 meters[4] |sidereal_day = |albedo = |spectral_type = |abs_magnitude = 20.5[2] |mean_motion = {{Deg2DMS|0.98819|sup=ms}} / day |observation_arc = 8787 days (24.06 yr) |uncertainty = 0 |moid = {{Convert|0.0833366|AU|Gm|abbr=on}} }} {{mp|(85770) 1998 UP|1}} is a near Earth, Aten asteroid orbiting at nearly a 1:1 resonance with Earth. OrbitWith an orbital period of 364.3 days, {{mp|1998 UP|1}} is in a near 1:1 orbital resonance with Earth. Although their periods are almost identical, their orbits are very different; {{mp|1998 UP|1}} has a highly eccentric orbit and moves between 0.65–1.35 AU from the Sun, it is also very highly inclined at 33°.[2] The preliminary period of {{mp|1998 UP|1}} was originally thought to be slightly longer than 1 year producing an error in the predicted position of about 35 degrees; it was selected as a priority for recovery and recovered by the Camarillo Observatory on 12 October 1999.[1] {{mp|1998 UP|1}} also makes close approaches to Venus and will pass {{convert|0.0255|AU|km mi|abbr=on|lk=off}} from Venus on 24 January 2115.[9]{{multiple image | align = left| direction = horizontal | width = 300| header = Animation of (85770) 1998 UP1 orbit from 1600 to 2500 | image1 = Animarion of (85770) 1998 UP1 orbit.gif | caption1 = Relative to Sun and Earth | image2 = Animation of (85770) 1998 UP1 orbit around Earth.gif | caption2 = Around Earth | image3 = Animation of (85770) 1998 UP1 orbit around Sun.gif | caption3 = Around Sun | footer ={{legend2| Yellow| Sun}}{{·}}{{legend2| RoyalBlue| Earth}}{{·}}{{legend2|Magenta| (85770) 1998 UP1 }} }} References1. ^{{Cite journal|title=Coordinated Amateur Recovery of One-Opposition NEAs |last=Rogers |first=John E. |publisher=Camarillo Observatory}} (J98U01P)[2][3][4]2. ^1 2 3 4 {{cite web |type=last observation: 2014-11-02; arc: 24 years |title=JPL Small-Body Database Browser: 85770 (1998 UP1) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1998UP1 |publisher=Jet Propulsion Laboratory |accessdate=7 April 2016}} 3. ^1 {{cite web |type=last observation: 2014-11-02; arc: 24 years |title=JPL Close-Approach Data: 85770 (1998 UP1) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1998UP1;cad=1#cad |accessdate=2015-02-28}} 4. ^1 {{cite web |title=Absolute Magnitude (H) |publisher=NASA/JPL |url=http://neo.jpl.nasa.gov/glossary/h.html |accessdate=2015-02-28}} }} External links
6 : Aten asteroids|Discoveries by LINEAR|Earth co-orbital asteroids|Venus-crosser asteroids|Earth-crosser asteroids|Astronomical objects discovered in 1998 |
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