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Ursa Astronomical Association
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Ursa Astronomical Association

(3431) Nakano - 18.11.2022 at 19.27 - 18.11.2022 at 19.38 Orimattila, Artjärvi, Tähtikallio Observation number 111165

Visibility III / V

Kari Laihia, Toni Veikkolainen, Juha Blad, Porin Karhunvartijat

(3431) Nakano (1951 PL,1962 PD,1962 QM,1970 AO,1973 SD2,1984 QC) Outer main belt asteroid imaged on first night of 2022 November talcos. The asteroid was discovered by the Japanese astronomer Tsutomu Seki (b.1930), at the Geisei Observatory (372 – Geisei) on August 24, 1984. Tsutomu Seki has discovered a total of 225 asteroids and comets C/1967 C1 (Seki 2) , C/1962 C1 (Seki–Lines) , C/1965 S1 (Ikeya-Seki 1) , C/1961 T1 (Seki 1) , C/ 1967 Y1 (Ikeya–Seki 2) , C/1970 U1 (Suzuki–Sato–Seki) . Source Wikipedia and . Geisei Observatory is located in the village of Geisei in Kochi Prefecture. Source Seki's comet finder pages. . The asteroid is named after the Japanese astronomer Shuichi Nakano (b.1947). Shuichi Nakano specializes in calculations of the future perihelion of the orbits of periodic comets, source Wikipedia . The asteroid has a length of 44.33 km and a rotation speed of 9.0563 h/r. When photographed, the asteroid was at a distance of 2.7223au and at its closest on August 25, 2022 at 1.949au.

1Fig. first image of the series L60s measured, 2022-11-18T 17:26:55UT 2459847.50837JDUT 21h53m49.05s -04d17'17.7" 16.146mag Std Dev 122.712 SNR31.724 FWHM4.273" ,JPL Horizon 17:26.53UT405m 04d17'18.3" 16.287mag .

2Fig. last image of series L60s measured, 2022-11-18T 17:37:37UT 2459902.23445JDUT 21h53m49.36s -04d17'16.4" 16.140mag Std Dev 136.758 SNR28.616 FWHM3.961" , JPL Horizon 17:27:353m -04d17'16.4s 04d17'16.7" 16.287mag .

3 Image sum image L60s 1-11 from a stack of images, movement is visible. Asteroid (76253) 2000 ER93 18.471mag, movement is visible. Bright star HD 208111 5.7 mag, fast characteristic motion and class A2IV. No other asteroids below 19.7mag.

TYC 5219-438-1 v.11.58mag star used for brightness measurement calibration.

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (3431) Nakano
  • Seeing
    • Good
Technical information

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

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