| 词条 | (8201) 1994 AH2 |
| 释义 |
| minorplanet = yes | name = {{mp|(8201) 1994 AH|2}} | background = #FFC2E0 | image = | image_size = | caption = | discovery_ref = | discovered = 5 January 1994 | discoverer = G. J. Garradd | discovery_site = Siding Spring Obs. | mpc_name = {{mp|(8201) 1994 AH|2}} | alt_names = {{mp|1994 AH|2}} | pronounced = | named_after = | mp_category = Apollo{{·}}NEO | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 34.86 yr (12,731 days) | aphelion = 4.3322 AU | perihelion = 0.7436 AU | semimajor = 2.5379 AU | eccentricity = 0.7070 | period = 4.04 yr (1,477 days) | mean_anomaly = 285.46° | mean_motion = {{Deg2DMS|0.2438|sup=ms}} / day | inclination = 9.5538° | asc_node = 164.12° | arg_peri = 25.120° | moid = 0.1012 AU{{·}}39.4 LD | jupiter_moid = 0.6611 AU | dimensions = {{val|1.859|0.183}} km[4][5] 2.17 km {{small|(calculated)}}[6] {{val|2.2}} km[7] | rotation = {{val|23.949}} h[7][9] {{val|24}} h{{efn|name=lcdb-Pravec-1998}} | albedo = 0.15 {{small|(estimated)}}[7] {{val|0.154|0.042}}[4][5] 0.18 {{small|(assumed)}}[6] | spectral_type = {{nowrap|SMASS {{=}} O {{·}}O [6][7]}} | abs_magnitude = 15.8[6]{{·}}16.3[4][7] }}{{mp|(8201) 1994 AH|2}} is a highly eccentric, rare-type asteroid, classified as near-Earth object of the Apollo group of asteroids, approximately 2 kilometers in diameter. It was discovered on 5 January 1994, by Australian amateur astronomer Gordon Garradd during the AANEAS survey at the Siding Spring Observatory, Australia.[21] Orbit and classificationThe asteroid orbits the Sun at a distance of 0.7–4.3 AU once every 4.04 years (1,477 days). Its orbit has an eccentricity of 0.71 and an inclination of 10° with respect to the ecliptic. {{mp|1994 AH|2}} has an Earth minimum orbital intersection distance of {{convert|0.1012|AU|km|abbr=on|lk=off|sigfig=3}}, which corresponds to 39.4 lunar distances. Due to its elongated orbit, it also approaches the orbit of Jupiter within {{convert|0.1022|AU|km|abbr=on|lk=off|sigfig=3}}. On 4 January 2079, it will pass {{convert|0.3595|AU|km|abbr=on|lk=on|sigfig=3}} from the Earth.[24]A first precovery was taken at the discovering observatory in 1981, extending the asteroid's observation arc by 13 years prior to its discovery.[21] Physical characteristicsIn the SMASS classification, {{mp|1994 AH|2}} is characterized as a rare O-type asteroid. Rotation periodIn the late 1990s, Czech astronomer Petr Pravec obtained two rotational lightcurves for this asteroid from photometric observations taken at the Ondřejov Observatory, Czech Republic. They gave a longer-than average rotation period of {{val|23.949}} and 24 hours with a brightness variation of 0.27 and 0.3 magnitude, respectively ({{small|U=2/n.a.}}).[9]{{efn|name=lcdb-Pravec-1998}} Diameter and albedoAccording to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 1.86 kilometers in diameter and its surface has an albedo of 0.154.[4][5] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and calculates a diameter of 2.17 kilometers, based on an absolute magnitude of 15.8.[6] American astronomer Richard Binzel gives a diameter of 2.2 kilometers.[7] NamingAs of 2017, {{mp|1994 AH|2}} remains unnamed.[21] Notes{{notelist|refs={{efn|name=lcdb-Pravec-1998|1=Pravec (1998) web: Observation from 15 July 1998. Rotation period {{val|24}} hours with a brightness amplitude of {{val|0.3}} mag. No quality rating available. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (8201) and Pravec, P.; Wolf, M.; Sarounova, L. (1998)}}}} References1. ^1 2 3 {{cite web |title = 8201 (1994 AH2) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=8201 |accessdate = 1 September 2016}} [1][2][3][4][5][6][7]2. ^1 {{cite web |type = 2016-08-27 last obs. |title = JPL Close-Approach Data: 8201 (1994 AH2) |url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=8201;cad=1#cad |publisher = Jet Propulsion Laboratory |accessdate = 1 September 2016}} 3. ^1 2 3 4 5 6 {{Cite journal |first1 = R. P. |last1 = Binzel |first2 = D. |last2 = Lupishko |first3 = M. |last3 = di Martino |first4 = R. J. |last4 = Whiteley |first5 = G. J. |last5 = Hahn |date = March 2002 |title = Physical Properties of Near-Earth Objects |url = http://www.lpi.usra.edu/books/AsteroidsIII/pdf/3048.pdf |journal = Asteroids III |pages = 255–271 |bibcode = 2002aste.book..255B |access-date= 1 September 2016}} 4. ^1 2 3 4 5 {{cite web |title = LCDB Data for (8201) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=8201%7C |accessdate = 1 September 2016}} 5. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |url = https://arxiv.org/pdf/1109.6407v1.pdf |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407 |access-date= 1 September 2016}} 6. ^1 2 {{Cite journal |first1 = Petr |last1 = Pravec |first2 = Lenka |last2 = Sarounová |first3 = Marek |last3 = Wolf |date = December 1996 |title = Lightcurves of 7 Near-Earth Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1996Icar..124..471P |journal = Icarus |volume = 124 |issue = 2 |pages = 471–482 |bibcode = 1996Icar..124..471P |doi = 10.1006/icar.1996.0223 |access-date= 1 September 2016}} 7. ^1 2 3 {{Cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Bauer |first4 = J. |last4 = Masiero |first5 = R. S. |last5 = McMillan |first6 = R. M. |last6 = Cutri |first7 = R. |last7 = Walker |first8 = E. |last8 = Wright |first9 = P. |last9 = Eisenhardt |first10 = D. J. |last10 = Tholen |first11 = T. |last11 = Spahr |first12 = R. |last12 = Jedicke |first13 = L. |last13 = Denneau |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T. |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = E. |last18 = Hand |first19 = W. |last19 = Mo |first20 = J. |last20 = Watkins |first21 = A. |last21 = Wilkins |first22 = G. L. |last22 = Bryngelson |first23 = A. |last23 = Del Pino Molina |first24 = S. |last24 = Desai |first25 = M. |last25 = Gómez Camus |first26 = S. L. |last26 = Hidalgo |first27 = I. |last27 = Konstantopoulos |first28 = J. A. |last28 = Larsen |first29 = C. |last29 = Maleszewski |first30 = M. A. |last30 = Malkan |first31 = J.-C. |last31 = Mauduit |first32 = B. L. |last32 = Mullan |first33 = E. W. |last33 = Olszewski |first34 = J. |last34 = Pforr |first35 = A. |last35 = Saro |first36 = J. V. |last36 = Scotti |first37 = L. H. |last37 = Wasserman |date = December 2011 |title = NEOWISE Observations of Near-Earth Objects: Preliminary Results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...743..156M |journal = The Astrophysical Journal |volume = 743 |issue = 2 |page = 17 |bibcode = 2011ApJ...743..156M |doi = 10.1088/0004-637X/743/2/156 |arxiv = 1109.6400 |access-date= 14 December 2016}} }} External links
4 : Apollo asteroids|Discoveries by Gordon J. Garradd|O-type asteroids (SMASS)|Astronomical objects discovered in 1994 |
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