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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

90482 Orcus - 27.3.2022 at 00.17 - 27.3.2022 at 00.21 Orimattila, Artjärvi, Tähtikallio Observation number 106225

Visibility I / V


90482 Orcus (2004 DW) The audible Plutino Trans-Neptune (TNO) asteroid was filmed on the second night of March 2022. Plutinos are in a 3: 2 orbital resonance with the planet Neptune, a total of 1/4 of the targets in the Kuiper belt are Plutinos. Source Wikipedia https://en.wikipedia.org/wiki/Plutino . The asteroid Orcus was discovered by American astronomers ME Brown, C. Trujillo, DL Rabinowitz on February 17, 2004 at the Palomar (675-Palomar Mountain) Observatory. Michael E. Brown's team has found many TNO targets, including Haumea, Eris, Makemake, Sedna, etc. Dr. Braun has been selected as one of Time's 100 Most Influential Humans in 2006. Brown has found a total of 29 asteroids. Source Wikipedia https://en.wikipedia.org/wiki/Michael_E._Brown . Dr. Chad Trujillo has worked as a computer software expert and director of adaptive optics for Gemini telescopes and discovered a total of 54 asteroids. Source Wikipedia https://en.wikipedia.org/wiki/Chad_Trujillo . David L. Rabinowitz has built CCD cameras and software to detect TNO targets. Rabinowitz has found a total of 34 asteroids. Source Wikipedia https://en.wikipedia.org/wiki/David_L._Rabinowitz . The name asteroid is given to Roman mythology Orcus (Etruscan origin) was the convict of the convicts. Moon Orcus I = Vanth .Vanth is a daimon in Etruscan mythology who guides the dead to the underworld. He often appears in burial paintings and sarcophagi, where he is depicted with wings and a torch. The name was suggested by S. Taaffe. [Reference: Minor Planet Circ. 53177]. Total estimate 1550km and rotation speed 13.188h / r. Source Wikipedia. https://en.wikipedia.org/wiki/90482_Orcus . When photographed, the asteroid was 47.1901au away.

Picture. 3x120s image sum measured, 2022-03-26T 21: 19: 01UT 2459665.38821JDUT 10h24m22.03s -11d51'01.4 "19.047mag Std Dev 72.831 SNR5.927 FWHM8.259", JPL Horizon 21: 19: 01UT 10h24m22.00s -11d51 '00 .6 "19.08mag. The comet-like marked object in the picture is not real, it is the residual charge of the CCD due to the previous description. A star was found at the point! No other asteroids below 24.0mag in the picture. TYC 5494-1472-1 v. 11.18mag stars.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 90482 Orcus
  • Seeing
    • Good
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 3x 120s

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