1182 Ilona

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1182 Ilona
001182-asteroid shape model (1182) Ilona.png
Modelled shape of Ilona from its lightcurve
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date3 March 1927
Designations
(1182) Ilona
Named after
unknown [2]
1927 EA ·A915 RD
main-belt  ·(inner) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 90.33 yr (32,993 days)
Aphelion 2.5261 AU
Perihelion 1.9930 AU
2.2596 AU
Eccentricity 0.1180
3.40 yr (1,241 days)
328.01°
0° 17m 24.72s / day
Inclination 9.3881°
336.38°
63.035°
Physical characteristics
Dimensions12.67±2.95 km [4]
13.29±2.48 km [5]
13.448±0.074 km [6]
14.09 km (derived) [3]
14.162±0.257 [7]
14.26±0.8 km [8]
17.88±0.62 km [9]
14.938±0.005 h [10]
29.8±0.1 h [11]
29.853±0.0627 h [12]
0.175±0.014 [9]
0.2039 (derived) [3]
0.22±0.11 [5]
0.221±0.016 [7]
0.2624±0.030 [8]
0.29±0.13 [4]
0.2957±0.0367 [6]
S [3]
11.04±0.96 [13]  ·11.3 [6] [8] [9]  ·11.50 [4] [7]  ·11.536±0.004(R) [12]  ·11.6 [1] [3]  ·11.77 [5]

    1182 Ilona, provisional designation 1927 EA, is a stony asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg Observatory on 3 March 1927, and later named Ilona. Any reference to its name is unknown. [14] [2]

    Contents

    Classification and orbit

    Ilona orbits the Sun in the inner main-belt at a distance of 2.0–2.5  AU once every 3 years and 5 months (1,241 days). Its orbit has an eccentricity of 0.12 and an inclination of 9° with respect to the ecliptic. [1] The asteroid was first identified as A915 RD at Bergedorf Observatory in September 1915. The body's observation arc, however, begins at Heidelberg one night after its official discovery observation. [14]

    Naming

    Any reference to a person or occurrence of this minor planet's name is unknown. The name was suggested by German astronomer Gustav Stracke. [2]

    Unknown meaning

    Among the many thousands of named minor planets, Ilona is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth. [15]

    Physical characteristics

    Ilona is an assumed stony S-type asteroid. [3]

    Rotation period and shape

    Three rotational lightcurve of Ilona were obtained from photometric observations. Lightcurve analysis gave a rotation period of 29.8 hours (including an alternative period solution 14.938 hours, or half the period) with a brightness variation of 0.98 to 1.20 magnitude ( U=2/2/2 ). [10] [11] [12] A high brightness amplitude typically indicates that the body has a non-spheroidal shape.

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ilona measures between 12.67 and 17.88 kilometers in diameter and its surface has an albedo between 0.175 and 0.2957. [4] [5] [6] [7] [8] [9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2039 and calculates a diameter of 14.09 kilometers based on an absolute magnitude of 11.6. [3]

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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1182 Ilona (1927 EA)" (2017-07-02 last obs.). Jet Propulsion Laboratory . Retrieved 17 August 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1182) Ilona". Dictionary of Minor Planet Names – (1182) Ilona. Springer Berlin Heidelberg. p. 99. doi:10.1007/978-3-540-29925-7_1183. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 7 "LCDB Data for (1182) Ilona". Asteroid Lightcurve Database (LCDB). Retrieved 17 August 2017.
    4. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv: 1509.02522 . Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID   9341381 . Retrieved 17 August 2017.
    5. 1 2 3 4 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv: 1606.08923 . Bibcode:2016AJ....152...63N. doi: 10.3847/0004-6256/152/3/63 .
    6. 1 2 3 4 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. S2CID   35447010.
    7. 1 2 3 4 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. S2CID   46350317 . Retrieved 17 August 2017.
    8. 1 2 3 4 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.
    9. 1 2 3 4 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. (online, AcuA catalog p. 153)
    10. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1182) Ilona". Geneva Observatory . Retrieved 17 August 2017.
    11. 1 2 Lecrone, Crystal; Addleman, Don; Butler, Thomas; Hudson, Erin; Mulvihill, Alex; Reichert, Chris; et al. (September 2005). "2004-2005 winter observing campaign at Rose-Hulman Institute: results for 1098 Hakone, 1182 Ilona, 1294 Antwerpia, 1450 Raimonda, 2251 Tikhov, and 2365 Interkosmos". The Minor Planet Bulletin. 32 (3): 46–48. Bibcode:2005MPBu...32...46L. ISSN   1052-8091 . Retrieved 17 August 2017.
    12. 1 2 3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv: 1504.04041 . Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. S2CID   8342929 . Retrieved 17 August 2017.
    13. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv: 1506.00762 . Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID   53493339 . Retrieved 17 August 2017.
    14. 1 2 "1182 Ilona (1927 EA)". Minor Planet Center. Retrieved 17 August 2017.
    15. ↑ Schmadel, Lutz D. (2007). "Appendix 11 – Minor Planet Names with Unknown Meaning". Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision. Springer Berlin Heidelberg. pp. 927–929. ISBN   978-3-540-00238-3.
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