19139 Apian

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19139 Apian
Discovery [1]
Discovered by F. Börngen
Discovery site Karl Schwarzschild Obs.
Discovery date 6 April 1989
MPC designation (19139) Apian
Named after
Petrus Apianus[2][3]
(German humanist)
1989 GJ8 · 1999 XP18
main-belt · (middle)
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 28.09 yr (10,261 days)
Aphelion 2.7824 AU
Perihelion 2.3841 AU
2.5832 AU
Eccentricity 0.0771
4.15 yr (1,516 days)
0° 14m 14.64s / day
Inclination 8.0241°
Physical characteristics
Dimensions 5.643±0.089 km[5]

19139 Apian, provisional designation 1989 GJ8, is a bright background asteroid from the central regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 6 April 1989, by German astronomer Freimut Börngen at the Karl Schwarzschild Observatory in Tautenburg, Eastern Germany. The asteroid was named for medieval German humanist Petrus Apianus.[2][3]

Orbit and classification[edit]

Apian is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the central main-belt at a distance of 2.4–2.8 AU once every 4 years and 2 months (1,516 days; semi-major axis of 2.58 AU). Its orbit has an eccentricity of 0.08 and an inclination of 8° with respect to the ecliptic.[1]

The body's observation arc begins with a precovery published in the Digitized Sky Survey and taken at Palomar Observatory in February 1989, approximately 2 months prior to its official discovery observation at Tautenburg.[3]

Physical characteristics[edit]

The asteroid's spectral type is unknown. Based on its albedo (see below), it is a stony rather than carbonaceous asteroid.

Rotation period[edit]

As of 2018, no rotational lightcurve of Apian has been obtained from photometric observations. The asteroid's rotation period, poles and shape remain unknown.[1][6]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Apian measures 5.643 kilometers in diameter and its surface has an albedo of 0.265.[5]


This minor planet was named after Petrus Apianus (1495–1552), also known as Peter Apian, a German mathematician and cartographer, who also built astronomical instruments. He is best known for his sky atlas Astronomicum Caesareum published in 1540. The lunar crater Apianus was also named in his honor.[2]

The approved naming citation was published by the Minor Planet Center on 20 November 2002 (M.P.C. 47168).[7]


  1. ^ a b c d e "JPL Small-Body Database Browser: 19139 Apian (1989 GJ8)" (2017-03-17 last obs.). Jet Propulsion Laboratory. Retrieved 3 January 2018. 
  2. ^ a b c Schmadel, Lutz D. (2006). Dictionary of Minor Planet Names – (19139) Apian. Springer Berlin Heidelberg. p. 856. ISBN 978-3-540-00238-3. Retrieved 3 January 2018. 
  3. ^ a b c "19139 Apian (1989 GJ8)". Minor Planet Center. Retrieved 3 January 2018. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 3 January 2018. 
  5. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 3 January 2018. 
  6. ^ "LCDB Data for (19139) Apian". Asteroid Lightcurve Database (LCDB). Retrieved 3 January 2018. 
  7. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 January 2018. 

External links[edit]