{{Short description|Mars-crossing asteroid}} {{Use dmy dates|date=August 2018}} {{Infobox planet | minorplanet = yes | name = 4451 Grieve | background = #FA8072 | image = | image_size = | caption = | discovery_ref = <ref name="MPC-object" /> | discoverer = C. Shoemaker | discovery_site = Palomar Obs. | discovered = 9 May 1988 | mpc_name = (4451) Grieve | alt_names = 1988 JJ{{·}}1971 GF<br />{{mp|1980 VE|1}} | pronounced = | named_after = Richard Grieve<ref name="MPC-object" /><br />{{small|(Canadian geologist)}} | mp_category = Mars-crosser<ref name="MPC-object" /><ref name="lcdb" /> | orbit_ref = <ref name="jpldata" /> | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 63.12 yr (23,053 d) | aphelion = 3.6024 AU | perihelion = 1.6064 AU | semimajor = 2.6044 AU | eccentricity = 0.3832 | period = 4.20 yr (1,535 d) | mean_anomaly = 348.28° | mean_motion = {{Deg2DMS|0.2345|sup=ms}} / day | inclination = 27.799° | asc_node = 219.38° | arg_peri = 110.23° | mars_moid = 0.4477 AU | mean_diameter = {{val|12.16|2.43|u=km}}<ref name="Ali-Lagoa-2017" /> | rotation = {{val|6.864|0.006|ul=h}}<ref name="Sheridan-2002" /> | albedo = {{val|0.189}}<ref name="Ali-Lagoa-2017" /> | spectral_type = SMASS {{=}} S<ref name="jpldata" /><ref name="lcdb" /><br />Svw {{small|(Bus–DeMeo)}}<ref name="Ferret" /> | abs_magnitude = 12.00<ref name="MPC-object" /><ref name="jpldata" /><ref name="lcdb" /><ref name="Ali-Lagoa-2017" /> }}
'''4451 Grieve''', provisional designation ''{{mp|1988 JJ}}'', is a stony asteroid and large Mars-crosser on an eccentric orbit from the central asteroid belt, approximately {{convert|12|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 9 May 1988, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.<ref name="MPC-object" /> The S-type asteroid is likely elongated and has a rotation period of 6.9 hours.<ref name="lcdb" /> It was named for Canadian geologist Richard Grieve.<ref name="MPC-object" />
== Orbit and classification ==
''Grieve'' is a Mars-crossing asteroid, crossing the orbit of Mars at 1.666 AU. Members of this dynamically unstable group are located between the main belt and near-Earth populations. It orbits the Sun at a distance of 1.6–3.6 AU once every 4 years and 2 months (1,535 days; semi-major axis of 2.6 AU). Its orbit has an eccentricity of 0.38 and an inclination of 28° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins with a precovery taken at Palomar in 1954, or 34 years prior to its official discovery observation.<ref name="MPC-object" />
== Physical characteristics ==
In the SMASS classification, ''Grieve'' is a common, stony S-type asteroid.<ref name="jpldata" /> In the Bus-DeMeo taxonomy it is a Svw-type.<ref name="Ferret" />
== Naming ==
This minor planet was named after Canadian geologist Richard Grieve, chief of geophysics with the Geological Survey of Canada. He is a leading investigator of terrestrial and lunar impact craters and maintains the global census of recognized impact structures on Earth. Grieve has led the effort to reliably determine the ages for these structures and has classified impacts in molten rocks based on the abundance and distribution of siderophile elements.<ref name="MPC-object" /> The official naming citation was published by the Minor Planet Center on 30 January 1991 ({{small|M.P.C. 17657}}).<ref name="MPC-Circulars-Archive" />
=== Rotation period ===
In October 2001, a rotational lightcurve of ''Grieve'' was obtained from photometric observations by American astronomer Edwin E. Sheridan at the Crescent Butte Observatory {{Obscode|682}} in Utah. Lightcurve analysis gave a rotation period of {{val|6.864|0.006}} hours with a brightness amplitude of 0.90 magnitude ({{small|U=3}}).<ref name="Sheridan-2002" /> Alternative observations by Robert Stephens (6.85 h) and Pierre Antonini (6.8607 h) were very similar ({{small|U=3/3}}).<ref name="Stephens-2002b" /><br />{{val|6.8607|0.0002|u=h}}<ref name="geneva-obs" /> The lightcurve's high brightness variation is indicative of an elongated shape.
=== Diameter and albedo ===
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Grieve'' measures 12.16 kilometers in diameter and its surface has an albedo of 0.189.<ref name="Ali-Lagoa-2017" /> The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo of 0.20 and calculates a diameter of 11.83 kilometers based on an absolute magnitude of 12.0.<ref name="lcdb" />
This makes ''Grieve'' one of the largest Mars-crossing asteroids (MCAs) comparable with 1310 Villigera (13.76 km), as most mid-sized MCA's measure below 10 kilometers such as 1139 Atami (9.35 km), 1474 Beira (14.9 km), 1011 Laodamia (7.5 km), 1727 Mette (5.44 km), 1131 Porzia (7 km), 1235 Schorria (5.55 km), 985 Rosina (8.18 km) and 1468 Zomba (7 km). However, largest members of this dynamical group, namely, 132 Aethra, 1508 Kemi, 2204 Lyyli and 512 Taurinensis are all larger than 20 kilometers in diameter.<ref name="Ali-Lagoa-2017" />
== References == {{reflist|30em|refs=
<ref name="jpldata">{{cite web |type = 2017-07-05 last obs. |title = JPL Small-Body Database Browser: 4451 Grieve (1988 JJ) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004451 |publisher = Jet Propulsion Laboratory |access-date = 31 August 2018}}</ref>
<ref name="MPC-object">{{cite web |title = 4451 Grieve (1988 JJ) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4451 |access-date = 31 August 2018}}</ref>
<ref name="MPC-Circulars-Archive">{{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |access-date = 31 August 2018}}</ref>
<ref name="geneva-obs">{{cite web |title = Asteroids and comets rotation curves – (4451) Grieve |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#004451 |access-date = 31 August 2018}}</ref>
<ref name="Ferret">{{cite web |title = Asteroid 4451 Grieve |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=4451+Grieve |access-date = 31 August 2018}}</ref>
<ref name="lcdb">{{cite LCDB|number = 4451 |access-date = 31 August 2018}}</ref>
<ref name="Ali-Lagoa-2017">{{Cite journal |first1 = V. |last1 = Alí-Lagoa |first2 = M. |last2 = Delbo' |date = July 2017 |title = Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data |journal = Astronomy and Astrophysics |volume = 603 |page = 8 |bibcode = 2017A&A...603A..55A |doi = 10.1051/0004-6361/201629917 |arxiv = 1705.10263 }}</ref>
<ref name="Sheridan-2002">{{Cite journal |author = Sheridan, E. E. |date = June 2002 |title = Rotational Periods and Lightcurve Photometry of 697 Galilea, 1086 Nata, 2052 Tamriko, 4451 Grieve, and (27973) 1997 TR25 |journal = The Minor Planet Bulletin |volume = 29 |pages = 32–33 |bibcode = 2002MPBu...29...32S }}</ref>
<ref name="Stephens-2002b">{{Cite journal |author = Stephens, R. D. |date = June 2002 |title = Photometry of 1471 Tornio and 4451 Grieve |journal = The Minor Planet Bulletin |volume = 29 |page = 34 |bibcode = 2002MPBu...29...34S }}</ref>
}} <!-- end of reflist -->
== External links == * [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }}) * [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books * [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center * {{AstDys|4451}} * {{JPL small body}}
{{Minor planets navigator |4450 Pan |number=4451 |4452 Ullacharles}} {{Small Solar System bodies}} {{Authority control}}
{{DEFAULTSORT:Grieve}} 004451 Category:Discoveries by Carolyn S. Shoemaker Category:Named minor planets 19880509