Astronomy:10252 Heidigraf
| Discovery[1] | |
|---|---|
| Discovered by | C. J. van Houten I. van Houten-G. T. Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 26 March 1971 |
| Designations | |
| (10252) Heidigraf | |
| Named after | Heidi Graf[1] (ESA manager) |
| 4164 T-1 · 1978 VX15 | |
| Minor planet category | main-belt[1][2] · (outer) Koronis[3][4] |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 46.83 yr (17,106 d) |
| |{{{apsis}}}|helion}} | 3.0525 AU |
| |{{{apsis}}}|helion}} | 2.6524 AU |
| 2.8524 AU | |
| Eccentricity | 0.0701 |
| Orbital period | 4.82 yr (1,760 d) |
| Mean anomaly | 138.89° |
| Mean motion | 0° 12m 16.56s / day |
| Inclination | 2.2591° |
| Longitude of ascending node | 33.300° |
| 289.53° | |
| Physical characteristics | |
| Mean diameter | 5.15 km (calculated)[4] 5.782±0.203 km[5][6] |
| Geometric albedo | 0.24 (assumed)[4] 0.331±0.057[5] 0.4007±0.1010[6] |
| S (assumed)[4] | |
| Absolute magnitude (H) | 12.8[6] 13.160±0.190 (R)[7] 13.2[2] 13.61[4] |
10252 Heidigraf, provisional designation 4164 T-1, is a Koronian asteroid from the outer regions of the asteroid belt, approximately 6 kilometers (3.7 miles) 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.[4] It was named after Heidi Graf, a former Head of the ESTEC Communications Office.[1]
Orbit and classification
Heidigraf is a core member of the Koronis family (605),[4][3] a very large outer asteroid family of six thousand known members with nearly co-planar ecliptical orbits.[8] 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.[2] The body's observation arc begins at Palomar on 24 March 1971, two nights prior to its official discovery observation.[1]
Palomar–Leiden Trojan survey
Physical characteristics
Heidigraf is an assumed stony S-type asteroid,[4] which is the overall spectral type of the Koronis family.[8]: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.[4][7]
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.[5][6] 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.[4]
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.[1] The official naming citation was published by the Minor Planet Center on 9 November 2006 (M.P.C. 57950).[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "10252 Heidigraf (4164 T-1)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=10252.
- ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 10252 Heidigraf (4164 T-1)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2010252.
- ↑ 3.0 3.1 "Asteroid 10252 Heidigraf – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=10252+Heidigraf#Asteroid%2010252%20HeidigrafEAR-A-VARGBDET-5-NESVORNYFAM-V3.0.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 "LCDB Data for (10252) Heidigraf". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=10252%7CHeidigraf.
- ↑ 5.0 5.1 5.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M.
- ↑ 6.0 6.1 6.2 6.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
- ↑ 7.0 7.1 Chang, Chan-Kao (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series 219 (2): 19. doi:10.1088/0067-0049/219/2/27. Bibcode: 2015ApJS..219...27C.
- ↑ 8.0 8.1 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
<ref> tag with name "MPC-discoverers" defined in <references> is not used in prior text.External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
- 10252 Heidigraf at AstDyS-2, Asteroids—Dynamic Site
- 10252 Heidigraf at the JPL Small-Body Database
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