|Discovered by||C. H. F. Peters|
|Discovery site||Litchfield Obs., Clinton|
|Discovery date||28 June 1886|
|MPC designation||259 Aletheia|
|Orbital characteristics |
|Epoch 27 June 2015 (JD 2457200.5)|
|Uncertainty parameter 0|
|Observation arc||117.00 yr (42,736 days)|
|5.55 yr (2027.5 days)|
|Earth MOID||1.7207 AU|
±6.82 km 190.05
|Mass||±0.43)×1018 kg (7.79|
|2.16 ± 0.26 g/cm3|
|B–V = 0.698
U–B = 0.311
CP (Tholen), X (SMASS)
259 Aletheia is a very large main-belt asteroid that was discovered by German–American astronomer Christian Peters on June 28, 1886, at Litchfield Observatory, Clinton, New York. The dark and heterogeneously composed X-type (Tholen: CP-type) asteroid contains primitive carbonaceous materials, responsible for its low albedo of 0.04. Aletheia measures about 185 kilometers in diameter and belongs to the largest asteroids of the main-belt. It has a semi-major axis of 3.1 AU and an orbit inclined by 11 degrees with a period of 5.55 years.
Richard P. Binzel and Schelte Bus further added to the knowledge about this asteroid in a lightwave survey published in 2003. This project was known as Small Main-belt Asteroid Spectroscopic Survey, Phase II or SMASSII, which built on a previous survey of the main-belt asteroids. The visible-wavelength (0.435-0.925 micrometre) spectra data was gathered between August 1993 and March 1999.
- "JPL Small-Body Database Browser: 259 Aletheia" (2015-09-15 last obs.). Jet Propulsion Laboratory. Retrieved 14 October 2015.
- Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (259) Aletheia. Springer Berlin Heidelberg. p. 38. ISBN 978-3-540-29925-7. Retrieved 14 October 2015.
- Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- Bus, S., Binzel, R. P. Small Main-belt Asteroid Spectroscopic Survey, Phase II. EAR-A-I0028-4-SBN0001/SMASSII-V1.0. NASA Planetary Data System, 2003.
- JPL Small-Body Database Browser
- Lightcurve Results
- "259 Aletheia". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2000259.
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
- 259 Aletheia at the JPL Small-Body Database
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