10252 Heidigraf

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]

10252 Heidigraf
Discovery [1]
Discovered byC. J. van Houten
I. van Houten-G.
T. Gehrels
Discovery sitePalomar Obs.
Discovery date26 March 1971
Designations
(10252) Heidigraf
Named after
Heidi Graf [1]
(ESA manager)
4164 T-1 · 1978 VX15
main-belt [1][2] · (outer)
Koronis [3][4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc46.83 yr (17,106 d)
Aphelion3.0525 AU
Perihelion2.6524 AU
2.8524 AU
Eccentricity0.0701
4.82 yr (1,760 d)
138.89°
0° 12m 16.56s / day
Inclination2.2591°
33.300°
289.53°
Physical characteristics
Mean diameter
5.15 km (calculated)[4]
5.782±0.203 km[5][6]
0.24 (assumed)[4]
0.331±0.057[5]
0.4007±0.1010[6]
S (assumed)[4]
12.8[6]
13.160±0.190 (R)[7]
13.2[2]
13.61[4]

    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

    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.[9]

    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 an 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).[10]

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    References
    1. "10252 Heidigraf (4164 T-1)". Minor Planet Center. Retrieved 1 May 2018.
    2. "JPL Small-Body Database Browser: 10252 Heidigraf (4164 T-1)" (2018-01-22 last obs.). Jet Propulsion Laboratory. Retrieved 1 May 2018.
    3. "Asteroid 10252 Heidigraf – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
    4. "LCDB Data for (10252) Heidigraf". Asteroid Lightcurve Database (LCDB). Retrieved 1 May 2018.
    5. 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. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68.
    6. 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    7. Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27.
    8. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    9. "Minor Planet Discoverers". Minor Planet Center. 2018. Retrieved 1 May 2018.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 May 2018.

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