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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

(5001) EMP - 18.11.2022 at 23.06 - 18.11.2022 at 23.17 Orimattila, Artjärvi, Tähtikallio Observation number 111200

Visibility III / V

Kari Laihia, Toni Veikkolainen, Juha Blad, Porin Karhunvartijat

(5001) EMP (1952 RF,1977 EN4,1982 KQ3,1987 SB1) main belt mid-region asteroid imaged on the first night of the 2022 November talcos. While photographing the Apollo asteroid (177614) 2004 HK33, this came into the same picture. The asteroid was discovered by American astronomer Edward LG "Ted" Bowell (b.1943) at Anderson Mesa Station (699) of the Lowel Observatory on September 19, 1987. The asteroid got its name from the Russian ephemeris of Minor Planets book, "Ehfemeridy Malykh Planet" (EMP). The asteroid has a size of 9.72 km and a rotation speed of 26.3919 h/r. When photographing, the asteroid was at a distance of 1.6093au and at its closest on October 21, 2022 at 1.496au.

1Fig. first image of the series L60s measured, 2022-11-18T 21:07:23UT 2459902.38012JDUT 02h16m54.07s -04d08'14.3" 16.127mag Std Dev 257.265 SNR44.794 FWHM3.534" ,JPL Horizon 21:07.16m52m -04d08'14.3" 04d08'13.6" 15.989mag .

2Fig. last image of the series L60s measured, 2022-11-18T 21:18:06UT 2459902.38756JDUT 02h16m53.78s -04d08'15.5" 16.162mag Std Dev 252.214 SNR44.217 FWHM3.630" , JPL Horizon 21:12.036m08s -04d08'15.5 04d08'14.9" 15.989mag .

3Fig. sum picture L60s 1-11 from a stack of pictures, fast movement is visible. Asteroid (177614) 2004 HK33 16.963mag, motion visible. Asteroid (130057) 1999 VA179 19.029mag, motion visible .Asteroid (154006) Suzannehawley 20.099mag, motion not visible ?

Figure 4. as reference image Simbad DSS image , (154006) Suzannehawley assumed location . No other asteroids below 22.8mag.

TYC 4623-767-1 v.11.89mag star used for brightness measurement calibration.

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (5001) EMP
  • Seeing
    • Good
Technical information

Alluna RC16, C415/3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 60s

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