1134 Kepler

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(1134) Kepler
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date25 September 1929
MPC designation(1134) Kepler
Named after
Johannes Kepler
1929 SA · 1951 SA
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc86.62 yr (31,638 days)
Aphelion3.9338 AU
Perihelion1.4219 AU
2.6779 AU
4.38 yr (1,601 days)
0° 13m 29.64s / day
Earth MOID0.4329 AU
Physical characteristics
Dimensions4±1 km (generic)[4]
0.1148 day[5]
SMASS = S[1]

1134 Kepler, provisional designation 1929 SA, is a stony asteroid and eccentric Mars-crosser from the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 25 September 1929, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany.[3] It is named after Johannes Kepler.[2]

Orbit and classification[edit]

Kepler orbits the Sun at a distance of 1.4–3.9 AU once every 4 years and 5 months (1,601 days). Its orbit has an eccentricity of 0.47 and an inclination of 15° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg, the night after its official discovery observation.[3]

Physical characteristics[edit]

In the SMASS taxonomy, Kepler is a stony S-type asteroid.[1]

Diameter and albedo[edit]

Its diameter has not been estimated by any of the prominent space-based surveys such as the Infrared Astronomical Satellite IRAS (1982), the Japanese Akari satellite (2006), NASA's Wide-field Infrared Survey Explorer (2009) or its subsequent NEOWISE mission (2013).[1] Based on a generic magnitude-to-diameter conversion, Kepler's diameter is between 3 and 8 kilometer for an absolute magnitude of 14.2 and an assumed albedo in the range of 0.25 to 0.05.[4] Since its spectral type falls into the class of stony asteroids, which have an averaged standard albedo around 0.20, Kepler's generic diameter is close to 4 kilometers, as the higher a body's albedo (reflectivity), the shorter its diameter at a fixed absolute magnitude (brightness).[4]

Kepler's rotation period is 0.1148 day,[5] a pretty common value for asteroids of this size.[6][7]


This minor planet was named on the commemoration of the 300th death anniversary of astronomer Johannes Kepler (1571–1630), best known for his laws of planetary motion. Kepler is also honored by a lunar and Martian crater, by Kepler Dorsum – a mountain ridge on the Martian moon Phobos, and by Kepler's Supernova.[2]

Naming citation was first published in 1930, in the astronomy journal Astronomical Notes (AN 240, 135).[2] The space observatory Kepler and its many discovered exoplanets also bear his name (see also Kepler (disambiguation)).


  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 1134 Kepler (1929 SA)" (2016-05-10 last obs.). Jet Propulsion Laboratory. Retrieved 8 February 2017.
  2. ^ a b c d Schmadel, Lutz D. (2007). "(1134) Kepler". Dictionary of Minor Planet Names – (1134) Kepler. Springer Berlin Heidelberg. p. 96. doi:10.1007/978-3-540-29925-7_1135. ISBN 978-3-540-00238-3.
  3. ^ a b c "1134 Kepler (1929 SA)". Minor Planet Center. Retrieved 8 February 2017.
  4. ^ a b c "Absolute Magnitude (H)". NASA/JPL. Retrieved 8 February 2017.
  5. ^ a b "(1134) Kepler lightcurve". CdR-CdL. Retrieved 9 December 2017.
  6. ^ "LCDB Data for (1134) Kepler". Asteroid Lightcurve Database (LCDB). Retrieved 8 February 2017.
  7. ^ "LCDB: Summary Table Query Form". Asteroid Lightcurve Database (LCDB). Retrieved 8 February 2017.

External links[edit]