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Ursa Astronomical Association
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Ursa Astronomical Association

(85713) 1998 SS49 - 18.11.2022 at 22.26 - 18.11.2022 at 22.37 Orimattila, Artjärvi, Tähtikallio Observation number 111185

Visibility IV / V

Kari Laihia, Toni Veikkolainen, Juha Blad, Porin Karhunvartijat

(85713) 1998 SS49 (1998 SS49) The Apollo NEO/PHA asteroid was imaged on the first night of the 2022 November talcos. The asteroid was discovered by the Linear Socorro Discovery Program (704 – Lincoln Laboratory ETS, New Mexico) on September 29, 1998. The asteroid has a length of 3.48 km and a rotation speed of 5.37 h/r. This Apollo is also a Mars-Earth-Venus Crosseri. When photographed, the asteroid was at a distance of 0.1455au and at its closest on November 21, 2022 at 0.14137au.

1Fig. first image of the series L15s measured, 2022-11-18T 20:26:42UT 2459902.35187JDUT 09h31m16.15s +46d45'48.9" 13.820mag Std Dev 449.667 SNR106.951 FWHM3.719" ,JPL Horizon 20:259h381m +99h31m16.15s 46d45'48.5" 14.138mag.

2Fig. last image of the series L15s measured, 2022-11-18T 20:36:44UT 2459902.35884JDUT 09h31m27.77s +46d45'49.8" 13.758mag Std Dev 419.068 SNR114.694 FWHM4.142" , JPL Horizon 20:39h61m +27.77s 46d45'49.3" 14.138mag .

3Fig. sum picture L15s 1-21 from a stack of pictures, very fast movement is visible. No other asteroids below 22.8mag. TYC 3426-1256-1 v.12.41mag star used for brightness measurement calibration.

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (85713) 1998 SS49
  • Seeing
    • Good
Technical information

Alluna RC16, C415/3320, Moravian G4-16000EC MkII, filter L, bin3 21 x 15s

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