1199 Geldonia

1199 Geldonia, provisional designation 1931 RF, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 32 kilometers in diameter. It was discovered on 14 September 1931, by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle.[11] The asteroid was named after the Belgian town of Jodoigne.[2]

1199 Geldonia
Discovery [1]
Discovered byE. Delporte
Discovery siteUccle Obs.
Discovery date14 September 1931
Designations
(1199) Geldonia
Pronunciation/ɡɛlˈdoʊniə/
Named after
Jodoigne [2]
(Belgian city)
1931 RF · 1930 MB
1946 OH · 1958 WC
A921 TF
main-belt · (outer)
Eos [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc95.48 yr (34,873 days)
Aphelion3.1016 AU
Perihelion2.9337 AU
3.0177 AU
Eccentricity0.0278
5.24 yr (1,915 days)
324.45°
0° 11m 16.8s / day
Inclination8.7917°
235.63°
291.33°
Physical characteristics
Dimensions30.395±0.243 km[5]
31.25±3.0 km [3][6]
32.858±0.315 km[7]
35.88±0.50 km[8]
36.08±0.58 km[9]
28.3±0.2 h[10]
0.098±0.004[9]
0.098±0.010[8][8]
0.1182±0.0108[7]
0.1299±0.029[6][3]
Tholen = CGTP: [1][3]
B–V = 0.760 [1]
U–B = 0.330 [1]
10.36[1][3][6][7][8][9]

    Orbit and classification

    Geldonia is a member the Eos family (606),[4] the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids.[12]:23 It orbits the Sun at a distance of 2.9–3.1 AU once every 5 years and 3 months (1,915 days). Its orbit has an eccentricity of 0.03 and an inclination of 9° with respect to the ecliptic.[1]

    The body's observation arc begins with its first identification as A921 TF at Heidelberg Observatory in October 1921, almost 10 years prior to its official discovery observation at Uccle.[11]

    Physical characteristics

    In the Tholen classification, Geldonia has an ambiguous spectral type, closest to a carbonaceous C-type asteroid with some similarities to the G-, T- and the primitive P-type asteroids, and was flagged as a nosy spectrum (CGTP:).[1][3] The overall spectral type for members of the Eoan family on the other hand is that of a K-type.[12]:23

    Rotation period

    In November 2010, a rotational lightcurve of Geldonia was obtained from photometric observations by Italian astronomer Silvano Casulli. Lightcurve analysis gave a longer-than-average rotation period of 28.3 hours with a brightness amplitude of 0.11 magnitude (U=2-). While not being a slow rotator, which have periods longer than 100 hours, Geldonia's spin rate is still longer than that of most minor planets, which typically rotate between 2 and 20 hours once around their axis.

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Geldonia measures between 30.395 and 36.08 kilometers in diameter and its surface has an albedo between 0.098 and 0.1182.[5][7][8][9]

    The Collaborative Asteroid Lightcurve Link adopts the results obtained by Infrared Astronomical Satellite, that is, an albedo of 0.1299 and a diameter of 31.25 kilometers based on an absolute magnitude of 10.36.[3][6]

    Naming

    This minor planet was named after the Belgian town of Jodoigne, also known by its Latin name of Geldenaken (hence the asteroid's name of "Geldonia"). It is the native town of the discoverer Eugène Delporte. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 111).[2]

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    References
    1. "JPL Small-Body Database Browser: 1199 Geldonia (1931 RF)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 28 September 2017.
    2. Schmadel, Lutz D. (2007). "(1199) Geldonia". Dictionary of Minor Planet Names – (1199) Geldonia. Springer Berlin Heidelberg. p. 100. doi:10.1007/978-3-540-29925-7_1200. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1199) Geldonia". Asteroid Lightcurve Database (LCDB). Retrieved 28 September 2017.
    4. "Asteroid 1199 Geldonia – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 28 September 2017.
    6. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    7. 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.
    8. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 28 September 2017.
    9. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    10. Behrend, Raoul. "Asteroids and comets rotation curves – (1199) Geldonia". Geneva Observatory. Retrieved 28 September 2017.
    11. "1199 Geldonia (1931 RF)". Minor Planet Center. Retrieved 28 September 2017.
    12. 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.

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