2623 Zech
| Discovery Synodic rotation period | 2.7401±0.0002 h[4] | |
|---|---|---|
| 0.20 (assumed)[3] | ||
| S [3][6] | ||
| 13.13±0.59[6] · 13.3[1][3] | ||
2623 Zech, provisional designation A919 SA, is a stony
Heidelberg Observatory in southwest Germany.[7] It was named after German ARI astronomer Gert Zech.[2]
Orbit
Zech is a stony
precoveries were taken, and no prior identifications were made.[7] On 8 June 2002, Zech passed 0.036 AU (5,400,000 km) from the major asteroid 3 Juno.[1]
Diameter
While "Johnston's Archive" estimates a diameter of 7.61 kilometers for Zech,
Binary system
Primary
In October 2004, a rotational
U=n.a.).[4] While not being a fast rotator
, it has a relatively fast spin rate for its size, as most minor planets rotate between 2.2 and 20 hours.
Moon
During Pray's photometric observations, it was revealed that Zech (primary) is in fact an asynchronous
minor planet moon orbiting it. The moon has an orbital period of 117.2 hours and a spin rate of 18.718 hours with an amplitude 0.08 magnitude.[4] Based on Pray's secondary-to-primary mean diameter ratio (Ds/p) of more than 0.29, the Johnston's Archive estimates a diameter of at least 2.21 kilometers for Zech's companion.[5]
Naming
This
M.P.C. 19692).[8]
References
- ^ a b c d e f "JPL Small-Body Database Browser: 2623 Zech (A919 SA)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 3 July 2017.
- ^ ISBN 978-3-540-00238-3.
- ^ a b c d e f g h "LCDB Data for (2623) Zech". Asteroid Lightcurve Database (LCDB). Retrieved 25 March 2017.
- ^ Bibcode:2014CBET.4012....1P. Archived from the originalon 12 June 2015. Retrieved 3 July 2017.
- ^ a b c d Johnston, Robert. "(2623) Zech". johnstonsarchive.net. Retrieved 25 March 2017.
- ^ S2CID 53493339.
- ^ a b "2623 Zech (A919 SA)". Minor Planet Center. Retrieved 25 March 2017.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 March 2017.
External links
- Determination of the Astronomical Unit by the Dynamical Method, J. Schubart and G. Zech (1967)
- The determination of the mass of the earth+moon system by the dynamical method from observations of Eros, G. Zech (1968)
- Donald Pray at Sugarloaf Mountain Observatory, Planetary Society
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 2623 Zech at AstDyS-2, Asteroids—Dynamic Site
- 2623 Zech at the JPL Small-Body Database
