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Ursa Astronomical Association

4660 Nereus - 6.11.2021 at 18.59 - 6.11.2021 at 19.16 Orimattila, Artjärvi, Tähtikallio Observation number 102386

Visibility III / V

Kari Laihia, Veikko Mäkelä, Toni Veikkolainen, Christos Oscar Kambiselis, Olli-Pekka Joronen, Eero Koivula, Porin Karhunvartijat

4660 Nereus (1982 DB) The asteroid Apollo NEO / PHA was photographed on the second night of November. The asteroid was discovered by Eleanor Francis "Glo" at the Helin Palomar Observatory (code 675) on February 28, 1982. The asteroid is named after an old man from the Greek mythology (lived in the Aegean Sea). Nereus was the son of Gaia and Pontus, the god of riches hidden in the sea. Source Wikipedia and Paavo Castre's "Ancient Myths" https://en.wikipedia.org/wiki/Nereus . The asteroid Nereus was targeted by the Japanese sonar Hayabusa but was not selected. Source Wikipedia https://en.wikipedia.org/wiki/4660_Nereus . There is a 3D model

https://3d-asteroids.space/asteroids/4660-Nereus . The size of the asteroid is 0.33km and the rotation time is 15.1h / r. Spectral class spec_B => Xe. When photographed, the asteroid was 0.1500au away and the nearest 12.11.2021 0.02630au.

1Picture. first image in the series1 L60s measured, 2021-11-06UT 16: 59: 27UT 2459525.20795JDUT 03h07m12.08s + 28d53'14.5 "15.341mag Std Dev 572.913 SNR95.027 FWHM3.550", JPL Horizon 16: 59: 27UT 03h07m12.6s + 28d53'13.5 "15.230 mag.

2Picture. last image in the series16 L60s measured, 2021-11-06UT 17: 15: 50UT 2459525.21932JDUT 03h07m12.32s + 28d53'30.1 "15.417mag Std Dev 319.458 SNR63.308 FWHM3.921", JPL Horizon 17: 15: 50UT 03h07m12.30s + 28d53'29.0 "15.230mag.

3Picture sum view of L60s 1-16 stack of images, fast motion is displayed. Asteroid (81094) 2000 ER104 18.852mag, motion shown. Asteroid (361100) 2006 DV36 19.496mag, motion shown. Asteroid (95690) 2002 JG44 19.478mag, motion not shown. Asteroid (210919) 2001 SS301 19983mag maybe visible? No other asteroids below 20.0 mag are shown. TYC 1795-1270-1 v. 10.78mag stars used to calibrate the brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 4660 Nereus
  • Seeing
    • Good
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 16 x 60s

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