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7796 Járacimrman
Discovery
Discovered by	Z. Moravec
Discovery site	Kleť Obs.
Discovery date	16 January 1996
Designations
MPC designation	(7796) Járacimrman
Pronunciation	Czech pronunciation: [ˈjaːratsɪmr̩man]
Named after	Jára Cimrman ; (Fictional Czech inventor, composer, writer, poet, and the teacher of the nation.)
Alternative designations	1996 BG · 1973 YE3; 1990 VG
Minor planet category	main-belt · (middle); Adeona
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	43.02 yr (15,712 days)
Aphelion	3.0429 AU
Perihelion	2.2879 AU
Semi-major axis	2.6654 AU
Eccentricity	0.1416
Orbital period (sidereal)	4.35 yr (1,589 days)
Mean anomaly	340.60°
Mean motion	0° 13m 35.4s / day
Inclination	12.811°
Longitude of ascending node	93.831°
Argument of perihelion	41.775°
Physical characteristics
Dimensions	11.312±0.313 km
Geometric albedo	0.055±0.011
Absolute magnitude (H)	13.4

7796 Járacimrman (Czech pronunciation: [ˈjaːratsɪmr̩man]) is a dark Adeonian asteroid orbiting in the central region of the asteroid belt, approximately 11 kilometers in diameter. Discovered by Zdeněk Moravec at the Kleť Observatory in 1996, it was later named after Jára Cimrman, a Czech fictional character.^[2]

Discovery

Járacimrman was discovered by Zdeněk Moravec at the Kleť Observatory in the Czech Republic, on 16 January 1996 and was initially designated 1996 BG.^[5] Observations continued until April 1996, and then again between June and July 1997. The asteroid was later determined to be a lost asteroid which had previously been observed twice: at the Brera-Merate Observatory in northern Italy on 12 December 1973, and at Mount Stromlo Observatory, near Canberra, Australia, on 8 and 9 July 1990.

Classification and orbit

The asteroid is a member of the Adeona family (505), a large family of carbonaceous asteroids.^[3]

In 1997, Járacimrman's orbit was calculated more precisely by additional observatories and it could therefore be numbered as asteroid 7796, the 312th recognized (numbered) asteroid discovered at the Kleť Observatory. Moravec suggested naming it after the fictional Czech polymath Jára Cimrman.

Physical characteristics

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Járacimrman measures 11.312 kilometers in diameter and its surface has an albedo of 0.055,^[4] which is typical for carbonaceous C-type asteroids. However, no spectral data is available for the asteroid, thus neither its chemical nor mineralogical composition is currently known. In addition, no rotational lightcurve has been obtained of Járacimrman as of 2017.^[6]

Naming

The citation accompanying the suggestion said: "Named for Jára Cimrman, a fictitious Czech genius. An analogue to Leonardo da Vinci, he was a playwright, composer, poet, painter, versatile scientist, inventor, polar explorer, sportsman, first man on the moon, etc. Although his name is not mentioned in any encyclopedia, his work is explored at the Jára Cimrman Theatre in Prague. This theatre is headed by the famous cimrmanologists Z. Svěrák and L. Smoljak, who endorsed the name proposal."^[2] The name was approved by International Astronomical Union (IAU) Committee on Small Body Nomenclature and published on 11 February 1998 (M.P.C. 31298).^[7]