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Contact information

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

Ursa Astronomical Association

(1987) Kaplan - 14.8.2022 at 23.04 - 14.8.2022 at 23.15 Orimattila, Artjärvi, Tähtikallio Observation number 109826

Visibility III / V

Kari Laihia, Porin Karhunvartijat

(1987) Kaplan (1952 RH) A main belt inner rim asteroid imaged during the third evening of the 2022 August talcos. The asteroid of the Phocaea family was discovered by the Soviet astronomer Pelageya Fedorovna Shajn (née Sannikova) at the Crimean Simeis (094 – Crimea-Simeis) observatory on September 11, 1952. Pelageya Shajn has discovered a total of 19 asteroids and the comet 61P/Shajn–Schaldach. Source Wikipedia https://en.wikipedia.org/wiki/Pelageya_Shajn . The asteroid is named in memory of "Samuil Aronovich Kaplan (1921-1978), head of the astrophysics department of the Lviv Observatory from 1948 to 1961, and then an employee of the Gorky Scientific Research Institute of Radiophysics. He was widely involved in many astrophysical topics, including white dwarfs, interstellar matter, radiation transfer, solar radiation, pulsars and galactic nuclei. [Ref: Minor Planet Circ. 5358]". Quote from https://minorplanetcenter.net/db_search/show_object?object_id=1987 . The asteroid has a size of 13.01 km and a rotation speed of 9.453 h/r. There is a 3-D model https://3d-asteroids.space/asteroids/1987-Kaplan . Spectral class according to family S . At the time of imaging, the asteroid was at a distance of 1.1881au and at its closest on October 1, 2022 at 1.022au.

1Fig. first image of the series L60s measured, 2022-08-14T 20:03:46UT 2459806.33594JDUT 00h53m21.25s +33d09'44.4" 15.116mag Std Dev 755.484 SNR43.342 FWHM4.375" ,JPL Horizon 20:010:43UT25m +25d09'44.4" 33d09'43.0" 14.630mag .

2Fig. last image of the series L60s measured, 2022-08-13T 20:14:31UT 2459806.34341JDUT 00h53m21.32s +33d09'55.7" 14.988mag Std Dev 918.253 SNR63.963 FWHM4.442" ,JPL Horizon 20:14.353m202s +33d09'55.7" 33d09'54.5" 14.630mag .

3 Image sum image L60s 1-11 from a stack of images, movement is visible. There are no others under 20.3 mag in the picture. asteroids.

TYC 2280-827-1 v.11.65 stars used for brightness measurement calibration.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (1987) Kaplan
  • Seeing
    • Average
Technical information

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

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