{{Short description|Koronian asteroid from the outer regions of the asteroid belt}} {{Use dmy dates|date=May 2018}} {{Infobox planet | minorplanet = yes | name = 10252 Heidigraf | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = <ref name="MPC-object" /> | discoverer = C. J. van Houten<br />I. van Houten-G.<br />T. Gehrels | discovery_site = Palomar Obs. | discovered = 26 March 1971 | mpc_name = (10252) Heidigraf | alt_names = 4164 T-1{{·}}{{mp|1978 VX|15}} | pronounced = | named_after = Heidi Graf<ref name="MPC-object" /><br />{{small|(ESA manager)}} | mp_category = main-belt<ref name="MPC-object" /><ref name="jpldata" />{{·}}{{small|(outer)}}<br />Koronis<ref name="Ferret" /><ref name="lcdb" /> | orbit_ref = <ref name="jpldata" /> | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 46.83 yr (17,106 d) | aphelion = 3.0525 AU | perihelion = 2.6524 AU | semimajor = 2.8524 AU | eccentricity = 0.0701 | period = 4.82 yr (1,760 d) | mean_anomaly = 138.89° | mean_motion = {{Deg2DMS|0.2046|sup=ms}} / day | inclination = 2.2591° | asc_node = 33.300° | arg_peri = 289.53° | mean_diameter = {{val|5.15|ul=km}} {{small|(calculated)}}<ref name="lcdb" /><br />{{val|5.782|0.203|u=km}}<ref name="Masiero-2011" /><ref name="WISE" /> | rotation = | albedo = {{val|0.24}} {{small|(assumed)}}<ref name="lcdb" /><br />{{val|0.331|0.057}}<ref name="Masiero-2011" /><br />{{val|0.4007|0.1010}}<ref name="WISE" /> | spectral_type = S {{small|(assumed)}}<ref name="lcdb" /> | abs_magnitude = 12.8<ref name="WISE" /><br />{{val|13.160|0.190}} {{small|(R)}}<ref name="Chang-2015" /><br />13.2<ref name="jpldata" /><br />13.61<ref name="lcdb" /> }}
'''10252 Heidigraf''', provisional designation {{mp|4164 T-1}}, is a Koronian asteroid from the outer regions of the asteroid belt, approximately {{convert|6|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered during the Palomar–Leiden Trojan survey on 26 March 1971, by Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at Palomar Observatory in California, United States. The likely elongated S-type asteroid has a brightness variation of 0.56 magnitude.<ref name="lcdb" /> It was named after Heidi Graf, a former Head of the ESTEC Communications Office.<ref name="MPC-object" />
== Orbit and classification ==
''Heidigraf'' is a core member of the Koronis family ({{small|605}}),<ref name="lcdb" /><ref name="Ferret" /> a very large outer asteroid family of six thousand known members with nearly co-planar ecliptical orbits.<ref name="Nesvorny-2014" /> It orbits the Sun in the outer main-belt at a distance of 2.7–3.1 AU once every 4 years and 10 months (1,760 days; semi-major axis of 2.85 AU). Its orbit has an eccentricity of 0.07 and an inclination of 2° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins at Palomar on 24 March 1971, two nights prior to its official discovery observation.<ref name="MPC-object" />
=== Palomar–Leiden Trojan survey ===
The survey designation "T-1" stands for the first Palomar–Leiden Trojan survey, named after the fruitful collaboration of the Palomar and Leiden Observatory in the 1960s and 1970s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroid discoveries.<ref name="MPC-discoverers" />
== Physical characteristics ==
''Heidigraf'' is an assumed stony S-type asteroid,<ref name="lcdb" /> which is the overall spectral type of the Koronis family.<ref name="Nesvorny-2014" />{{rp|23}}
=== Rotation period ===
In January 2014, astronomers at the Palomar Transient Factory observed ''Heidigraf'' photometrically in the R-band during which it showed a brightness amplitude of 0.56 magnitude, indicative for a non-spheroidal shape. However no rotational lightcurve could be constructed and its rotation period remains unknown.<ref name="lcdb" /><ref name="Chang-2015" />
=== Diameter and albedo ===
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Heidigraf'' measures 5.782 kilometers in diameter and its surface has an albedo of 0.331 and 0.4007, respectively.<ref name="Masiero-2011" /><ref name="WISE" /> The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo of 0.24 and calculates a diameter of 5.15 kilometers based on an absolute magnitude of 13.61.<ref name="lcdb" />
== Naming ==
This minor planet was named after Heidi Graf (born 1941), former Head of the European Space Research and Technology Centre (ESTEC) Communications Office from 1977 to 2006 at the European Space Agency, ESA.<ref name="MPC-object" /> The official naming citation was published by the Minor Planet Center on 9 November 2006 ({{small|M.P.C. 57950}}).<ref name="MPC-Circulars-Archive" />
== References == {{reflist|30em|refs=
<ref name="jpldata">{{cite web |type = 2018-01-22 last obs. |title = JPL Small-Body Database Browser: 10252 Heidigraf (4164 T-1) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2010252 |publisher = Jet Propulsion Laboratory |access-date = 1 May 2018}}</ref>
<ref name="MPC-object">{{cite web |title = 10252 Heidigraf (4164 T-1) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=10252 |access-date = 1 May 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 = 1 May 2018}}</ref>
<ref name="Masiero-2011">{{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = J. |last6 = Dailey |first7 = P. R. M. |last7 = Eisenhardt |first8 = R. S. |last8 = McMillan |first9 = T. B. |last9 = Spahr |first10 = M. F. |last10 = Skrutskie |first11 = D. |last11 = Tholen |first12 = R. G. |last12 = Walker |first13 = E. L. |last13 = Wright |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T. IV |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = A. |last18 = Wilkins |date = November 2011 |title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 20 |bibcode = 2011ApJ...741...68M |doi = 10.1088/0004-637X/741/2/68 |arxiv = 1109.4096 }}</ref>
<ref name="MPC-discoverers">{{cite web |title = Minor Planet Discoverers |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/lists/MPDiscsNum.html |date = 2018 |access-date = 1 May 2018}}</ref>
<ref name="Ferret">{{cite web |title = Asteroid 10252 Heidigraf – Nesvorny HCM Asteroid Families V3.0 |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=10252+Heidigraf#Asteroid%2010252%20HeidigrafEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 |access-date = 27 October 2019}}</ref>
<ref name="Nesvorny-2014">{{Cite book |first1 = D. |last1 = Nesvorný |first2 = M. |last2 = Broz |first3 = V. |last3 = Carruba |date = December 2014 |chapter = Identification and Dynamical Properties of Asteroid Families |title = Asteroids IV |pages = 297–321 |bibcode = 2015aste.book..297N |doi = 10.2458/azu_uapress_9780816532131-ch016 |arxiv = 1502.01628 |isbn = 9780816532131 }}</ref>
<ref name="lcdb">{{cite LCDB|number = 10252 |access-date = 1 May 2018}}</ref>
<ref name="WISE">{{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 |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 }}</ref>
<ref name="Chang-2015">{{cite journal |display-authors = 6 |first1 = Chan-Kao |last1 = Chang |first2 = Wing-Huen |last2 = Ip |author2-link = Ip Wing-huen |first3 = Hsing-Wen |last3 = Lin |first4 = Yu-Chi |last4 = Cheng |first5 = Chow-Choong |last5 = Ngeow |first6 = Ting-Chang |last6 = Yang |first7 = Adam |last7 = Waszczak |first8 = Shrinivas R. |last8 = Kulkarni |first9 = David |last9 = Levitan |first10 = Branimir |last10 = Sesar |first11 = Russ |last11 = Laher |first12 = Jason |last12 = Surace |first13 = Thomas. A. |last13 = Prince |date = August 2015 |title = Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory |journal = The Astrophysical Journal Supplement Series |volume = 219 |issue = 2 |page = 19 |bibcode = 2015ApJS..219...27C |doi = 10.1088/0067-0049/219/2/27 |arxiv = 1506.08493 }}</ref>
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== 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 * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs010001.html Discovery Circumstances: Numbered Minor Planets (10001)-(15000)] – Minor Planet Center * {{AstDys|10252}} * {{JPL small body}}
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{{DEFAULTSORT:Heidigraf}} 010252 Category:Discoveries by Cornelis Johannes van Houten Category:Discoveries by Ingrid van Houten-Groeneveld Category:Discoveries by Tom Gehrels 4164 Category:Named minor planets 19710326