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255 Oppavia

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Main-belt asteroid

255 Oppavia
Discovery
Lightcurve-base 3D-model of 255 Oppavia.
Discovered by	Johann Palisa
Discovery date	31 March 1886
Designations
MPC designation	(255) Oppavia
Pronunciation	/ɒˈpeɪviə/
Named after	Opava
Alternative designations	A886 FB, 1904 EC 1924 TA, 1938 VC 1938 XC, 1945 GD 1951 SG
Minor planet category	Main belt
Orbital characteristics^[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	129.86 yr (47,431 d)
Aphelion	2.959 AU (442.6 Gm)
Perihelion	2.533 AU (379.0 Gm)
Semi-major axis	2.746 AU (410.8 Gm)
Eccentricity	0.077427
Orbital period (sidereal)	4.551 yr (1,662.1 d)
Averageorbital speed	17.98 km/s
Mean anomaly	261.139°
Mean motion	0° 12^m 59.735^s / day
Inclination	9.47209°
Longitude of ascending node	13.6708°
Argument of perihelion	156.011°
Physical characteristics
Dimensions	57.40±1.5 km
Synodic rotation period	19.499 h (0.8125 d)
Geometric albedo	0.0374±0.002
Spectral type	X^[2]
Absolute magnitude (H)	10.39

255 Oppavia is a sizeableMain belt asteroid. It was discovered by Austrian astronomerJohann Palisa on 31 March 1886 inVienna and was named afterOpava, a town in theCzech Republic, then part ofAustria-Hungary, where Palisa was born.^[3] It is orbiting the Sun at a distance of2.75 AU with anorbital eccentricity (ovalness) of 0.077 and aperiod of 4.55 yr. Theorbital plane is inclined by an angle of 9.47° to theplane of the ecliptic.^[1]

Photometric observations made during 2013 indicate asynodic rotation period of19.499±0.001 h with anamplitude of 0.16±0.02 in magnitude. The unusuallight curve shows three uneven minima and maxima per cycle.^[4] In 1995, 255 Oppavia was suggested as a peripheral member of the now defunctCeres asteroid family,^[5] but was found to be an unrelated interloper on the basis of its non-matchingspectral type. It classified as a darkX-type asteroid in theTholen taxonomy.^[2]

^^a ^b"255 Oppavia".JPL Small-Body Database.NASA/Jet Propulsion Laboratory. Retrieved12 May 2016.
^^a ^bLazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004)."S³OS²: the visible spectroscopic survey of 820 asteroids"(PDF).Icarus.172 (1):179–220.Bibcode:2004Icar..172..179L.doi:10.1016/j.icarus.2004.06.006. Retrieved9 March 2022.
^Schmadel, Lutz D. (2013).Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 56.ISBN 9783662066157.
^Pilcher, Frederick (July 2013). "Rotation Period Determinations for 102 Miriam, 108 Hecuba, 221 Eos 225 Oppavia, and 745 Mauritia, and a Note on 871 Amneris".Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers.40 (3):158–160.Bibcode:2013MPBu...40..158P.
^Morbidelli, A.; et al. (November 1995)."Asteroid Families Close to Mean Motion Resonances: Dynamical Effects and Physical Implications"(PDF).Icarus.118 (1):132–154.Bibcode:1995Icar..118..132M.doi:10.1006/icar.1995.1181. Retrieved9 April 2022.

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Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

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Authority control databases	JPL SBDB MPC

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