1766 Slipher

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1766 Slipher
Discovery [1]
Discovered by Indiana University
(Indiana Asteroid Program)
Discovery site Goethe Link Obs.
Discovery date 7 September 1962
MPC designation 1766 Slipher
Named after
Vesto Slipher and
Earl C. Slipher[2]
1962 RF · 1953 UR
1980 RH5
main-belt · (outer)[3]
Lydia family[citation needed]
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 61.63 yr (22511 days)
Aphelion 2.9901 AU (447.31 Gm)
Perihelion 2.5063 AU (374.94 Gm)
2.7482 AU (411.12 Gm)
Eccentricity 0.088010
4.56 yr (1664.1 d)
0° 12m 58.824s / day
Inclination 5.2283°
Earth MOID 1.50136 AU (224.600 Gm)
Jupiter MOID 2.41937 AU (361.933 Gm)
Jupiter Tisserand parameter 3.335
Physical characteristics
Dimensions 20.2 km (calculated)[3]
7.6773±0.0145 h[1]
(S Band)[4]
7.6926±0.0024 h
(R Band)[4]
0.057 (assumed)[3]

1766 Slipher, provisional designation 1962 RF, is a dark, 20-kilometer sized Lydia asteroid dwelling in the outer parts of the main-belt. It was discovered at the U.S. Goethe Link Observatory near Brooklyn, Indiana by the Indiana Asteroid Program on September 7, 1962.[5] The asteroid orbits the Sun at a distance of 2.5–3.0 AU once every 4.56 years (1,664 days).[1]

The C-type body with an assumed albedo of about 0.06[3] belongs to the same asteroid family as 363 Padua does, namely the Lydia family, as it shares similar dynamic properties.[6] In 2015, its rotation period was determined in both, the S and R band, using data from the Palomar Transient Factory survey. The fitted periods gave 7.6773±0.0145 hours in the S Band and 7.6926±0.0024 hours in the R Band, with an amplitude of 0.20 and 0.19 in magnitude, respectively.[4]

It is named after the brothers Vesto Slipher (1876–1969) and Earl C. Slipher (1883–1964), both graduates of Indiana University. Slipher was a pioneer investigator of the spectra of the planets, and was the first to measure the redshifts of galaxies, which was instrumental for Hubble's discovery of the expanding Universe. Earl. Slipher developed and improved the direct photography of the planets. His photographs are the only continuous and systematic record of the appearance of the planets for a period of more than half a century.[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1766 Slipher (1962 RF)" (2015-06-18 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2016. 
  2. ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1766) Slipher. Springer Berlin Heidelberg. p. 141. ISBN 978-3-540-29925-7. Retrieved 13 October 2015. 
  3. ^ a b c d "LCDB Data for (1766) Slipher". Asteroid Lightcurve Database (LCDB). Retrieved 3 November 2015. 
  4. ^ a b c 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:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 3 November 2015. 
  5. ^ "1766 Slipher (1962 RF)". Minor Planet Center. Retrieved 3 November 2015. 
  6. ^ Carruba, V. (May 2009), "The (not so) peculiar case of the Padua family", Monthly Notices of the Royal Astronomical Society, 395 (1): 358–377, Bibcode:2009MNRAS.395..358C, doi:10.1111/j.1365-2966.2009.14523.x. 

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