Contact information

Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

99942 Apophis - 5.3.2021 at 21.26 - 5.3.2021 at 23.08 Tampere Observation number 96528

Visibility II / V

Tapio Lahtinen, Tampereen Ursa

Apophis belongs to the so-called Aten asteroid family, which means that the asteroids belonging to the family remain inside the Earth's orbit
According to the latest estimates, the size of the asteroid is between 340 and 370 meters.

The asteroid was at this time's bypass at its nearest distance of about 44 months, which means about 16.9 million kilometers.

I measured the brightness of the asterod mag 15.4.

On Friday, April 13, 2029, Apophis will pass the Earth at a distance of about 31,643 kilometers. This distance is smaller than with so-called geosynchronous satellites.

More information in Finnish and English .

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 99942 Apophis
    • Heikosti näkyvä
Technical information

TS80 Triplet, 0.8x Reducer, SXV-694, 30 x 2 min

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