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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

(3553) Mera - 20.5.2023 at 01.50 - 20.5.2023 at 02.01 Orimattila, Artjärvi, Tähtikallio Observation number 116505

Visibility II / V

(3553) Mera (1985 JA) The Cupid/NEO asteroid was imaged on the first night of the 2023 May talcos. The asteroid was discovered by the American astronomer Carolyn S. Shoemaker (1929 – 2021) at the Palomar Observatory (675 – Palomar Mountain) on May 14, 1985. The asteroid is named after the daughter of King Praetus in Greek mythology. He was a follower of Artemis and was killed by the goddess because she had given herself to Zeus. Before she died, she gave birth to Locri, the ancestor of the Locrians. [Ref: Minor Planet Circ. 11751] . Total estimate 1.9km and rotation speed 3.1944h/r. When photographed, the asteroid was at a distance of 0.4460au and at its closest on May 6, 2023 at 0.41414au.

1Fig. first image of the series L60s measured, 2023-05-19T 22:50:24UT 2460084.45166JDUT 16h54m54.21s +01d24'03.4" 16.501mag Std Dev 314.099 SNR5.004 FWHM9.249" ,JPL Horizon 22:50:2 4UT 16h54m54.22s + 01d24'01.1" 16.412mag .

2Fig. last image of series L60s measured, 2023-05-19T 23:01:03UT 2460084.45906JDUT 16h54m53.20s +01d24'31.8" 15.723mag Std Dev 362.561 SNR6.604 FWHM3.044" , JPL Horizon 23:01:0 3UT 16h54m53.20s + 01d24'30.3" 16.412mag .

3Fig. sum picture L60s 1-11 from a stack of pictures. Asteroid (176) Iduna 13.706mag. There are no others under 20.9 mag in the picture. asteroids.

TYC 385-163-1 11.79 mag used for brightness measurement calibration. stars.

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (3553) Mera
  • Seeing
    • Mediocre
Technical information

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

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