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Ursa Astronomical Association

3361 Orpheus - 6.11.2021 at 23.48 - 7.11.2021 at 00.09 Orimattila, Artjärvi, Tähtikallio Observation number 102289

Visibility III / V


3361 Orpheus (1982 HR) The asteroid Apollo NEO / PHA was photographed on the second night of November. The asteroid was discovered by Cilean astronomer Carlos Torres (1929-2011) at the National Astronomical Observatory (Chile) at Cerro El Roble Observatory (805) on April 24, 1982. In addition to asteroids, Carlos Torres has measured the motion of nearby stars and found a total of 37 asteroids, Wikipedia https: // en. wikipedia.org/wiki/Carlos_Torres_(astronomer) . Cerro El Roble Observatory is located on the mountain of the same name about 63km northwest of Santiago, source Wikipedia https://en.wikipedia.org/wiki/National_Astronomical_Observatory_(Chile) #Cerro_El_Roble_Station #Cerro_El_Roble_Station "href =" htt / National_Astronomical_Observatory_ (Chile) #Cerro_El_Roble_Station "> https://en.wikipedia.org/wiki/National_Astronomical_Observatory_ (Chile) #Cerro_El_Roble_Station (Orpheus) Orpheus was the son of the Muse of Oigros, the king of the rock and the god of the river, he received Lyran as a gift from Apollonia, which he played beautifully.

https://en.wikipedia.org/wiki/Orfeus . The size of the asteroid is about 300m and the rotation speed is 3.5327h / r. 3361 The Orpheus orbit takes it close to the orbit of Venus. When shooting, the clouds prevented the use of the beginning of the exposure series, however, Figures 7-11 were sufficient to detect very rapid movement. At the time of filming, the asteroid was 0.0807au and as of November 21, 2021, 0.0385au.

1Picture. first image in the series7 L120s measured, 2021-11-06UT 22: 00: 33UT 2459525.41704JDUT 02h48m51.50s -05d25'13.7 "15.373mag Std Dev 187.740 SNR42.443 FWHM5.578", JPL Horizon 22: 00: 33UT 02h48m51.61s - 05d25'07.9 "14.914mag.

2Picture. last image in the series11 L120s measured, 2021-11-06UT 22: 08: 54UT 2459525.42284JDUT 02h48m51.06s -05d25'48.2 "15.234mag Std Dev 255.983 SNR58.936 FWHM7.094", JPL Horizon 22: 08: 54UT 02h48m48.2s - 05d25'43.8 "14,914 mag.

3Picture summary image of the L120s 1-11 stack of images, fast motion is displayed. Asteroid (47699) 2000 CP116 18.2mag, motion shown. Asteroid (167484) 2003 YJ63 18,587 mag, motion not shown. No other asteroids below 19.0 mag are shown. The TYC 4705-864-1 v. 11,867 mag stars used to calibrate the brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 3361 Orpheus
  • Seeing
    • Average
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 120s

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