(3369) Freuchen

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Asteroid
(3369) Freuchen
Properties of the orbit ( animation )
Epoch:  July 31, 2016 ( JD 2,457,600.5)
Orbit type Main outer belt asteroid
Asteroid family Emma family
Major semi-axis 3.0413  AU
eccentricity 0.1399
Perihelion - aphelion 2.6158 AU - 3.4668 AU
Inclination of the orbit plane 7.9796 °
Length of the ascending node 267.4437 °
Argument of the periapsis 142.2231 °
Time of passage of the perihelion January 3, 2018
Sidereal period 5.30 a
Mean orbital velocity 17.07 km / s
Physical Properties
Medium diameter 23.648 km (± 0.012)
Albedo 0.050 (± 0.062)
Absolute brightness 12.3 mag
history
Explorer Poul Jensen , Karl Augustesen
Date of discovery October 18, 1985
Another name 1985 UZ , 1971 CA, 1975 XF 2 , 1979 OG 16 , 1980 XD 1
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(3369) Freuchen is an asteroid of the outer main belt , which was discovered on October 18, 1985 by the Danish astronomers Poul Jensen and Karl Augustesen at the Schmidt telescope of the Brorfelde observatory ( IAU code 054) near Holbæk . There had been several sightings of the asteroid before: on February 1 and 2, 1971 under the provisional designation 1971 CA at the Hamburg observatory in Bergedorf , on December 1, 1975 (1975 XF 2 ) and on July 31 and August 19 1979 (1979 OG 16 ) at the Crimean Observatory in Nautschnyj and on December 9 and 13, 1980 (1980 XD 1 ) at the observatory on the purple mountain near Nanjing .

The Italian astronomer Vincenzo Zappalà defines in a publication from 1995 (et al.) That the asteroid belongs to the Eos family, a group of asteroids that typically have large semiaxes from 2.95 to 3.1 AU , bounded inwards by the Kirkwood gap of the 7: 3 resonance with Jupiter , as well as orbital inclinations between 8 ° and 12 °. The group is named after the asteroid (221) Eos . The family is believed to have emerged from a collision more than a billion years ago. In the more recent AstDyS-2 database, (3369) Freuchen is seen as belonging to the Emma family, a small asteroid family named after its largest member (283) Emma , a double asteroid . (3369) Freuchen also shows a higher eccentricity than the Eos asteroids with more than 0.14 .

According to the SMASS classification ( Small Main-Belt Asteroid Spectroscopic Survey ), a spectroscopic study by Gianluca Masi , Sergio Foglia and Richard P. Binzel at (3369) Freuchen assumed a dark surface, so it could, roughly speaking, be around trade a C asteroid . However, this would not correspond to either the Eos or Emma families.

The timeless (non- osculating ) orbital elements of (3369) Freuchen are almost identical to those of the two smaller ones, assuming the absolute magnitude of 14.6 and 16.6 compared to 12.2, asteroids (109024) 2001 QS 8 and ( 271221) 2003 TM 35 .

(3369) Freuchen was named on September 18, 1986 after the Danish polar explorer and writer Peter Freuchen (1886–1957). It was named for the 100th anniversary of Freuchen's birth.

See also

Web links

Individual evidence

  1. ↑ (3369) Freuchen at the IAU Minor Planet Center (English)
  2. ↑ Database with the assignment of 12,487 asteroids to asteroid groups (English)
  3. ↑ David Vokrouhlický , Miroslav Brož , Alessandro Morbidelli , William Bottke , David Nesvorný , Daniel Lazzaro, Andy Rivkin: Yarkovsky footprints in the Eos family (English, PDF ; 26 MB)
  4. ↑ The family membership of (3369) Freuchen in the AstDyS-2 database (English)
  5. ^ Gianluca Masi, Sergio Foglia, Richard P. Binzel: Search for Unusual Spectroscopic Candidates Among 40313 minor planets from the 3rd Release of the Sloan Digital Sky Survey Moving Object Catalog . (English)
  6. ↑ subdivision of asteroids to S-types, C-types and V-types (English)
  7. ↑ The family status of the asteroids in the AstDyS-2 database (English, HTML; 51.4 MB)