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Contact information

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

Ursa Astronomical Association

4660 Nereus - 4.12.2021 at 16.20 - 4.12.2021 at 16.27 Orimattila, Artjärvi, Tähtikallio Observation number 103006

Visibility IV / V


4660 Nereus (1982 DB) The asteroid Apollo NEO / PHA was photographed on the second night of the December work. The asteroid was discovered by Eleanor Francis "Glo" at the Helin Palomar Observatory (code 675) on February 28, 1982. We have photographed this asteroid earlier in the November work. 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 0.0374au away and the nearest 11.12.2021 0.02630au. This subject was first photographed during the evening while still enjoying the twilight.

1Picture. first image in series 1 L15s measured, 2021-12-04UT 14: 20: 14UT 2459553.09738JDUT 04h45m38.32s + 59d25'28.1 "12.569mag Std Dev 1385.532 SNR51.776 FWHM4.092", JPL Horizon 14: 20: 14UT 04h45m38.19s + 59d25'26.0 "12.715mag.

2Picture. last image in the series 20 L15s measured, 2021-12-04UT 14: 26: 43UT 2459553.10188JDUT 04h45m44.57s + 59d26'19.6 "12.524mag Std Dev 1483.496 SNR83.259 FWHM4.406", JPL Horizon 14: 26: 43UT 04h45m44.44s + 59d26'17.9 "12.714 mag.

3Picture sum of L60s from a stack of 1-20 images, fast motion is displayed. No other asteroids below 24.0 mag are shown. TYC 3745-1370-1 v. 11.05mag stars used to calibrate brightness measurement.


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

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 20 x 15s

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