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Observation by rroberto: 30x10s with the Frasso Sabino telescope ...

Uploaded by

BAA Comet Section

Observer

rroberto

Observed

2021 Sep 12 - 00:00

Uploaded

2021 Sep 15 - 06:24

Objects

C/2021 A1

Planetarium overlay









Constellation

Ursa Major

Field centre

RA: 11h02m
Dec: +39°57'
Position angle: -0°49'

Field size

0°28' × 0°22'

Full filename

2021a1/2021a1_20210912_rroberto.jpg

Target name

C/2021 A1

Title

30x10s with the Frasso Sabino telescope (Diameter 369mm, focal length 2468mm, approximately F/6.66). Scale 1".34/pixel, field of 22'.8x28'.5 with north up and east to the left. The comet was very low on the horizon from 11° to 12° and obviously the seeing was bad but it shows quite well the coma and a slightly fan-shaped tail so I think of type II. The magnitude estimated with Astrometrica is 13.2 with a coma of 24" (0'.4) corresponding to 18 pixels in diameter. What you see is a sum with a lot of contrast.

About this image
30x10s with the Frasso Sabino telescope (Diameter 369mm, focal length 2468mm, approximately F/6.66). Scale 1".34/pixel, field of 22'.8x28'.5 with north up and east to the left. The comet was very low on the horizon from 11° to 12° and obviously the seeing was bad but it shows quite well the coma and a slightly fan-shaped tail so I think of type II. The magnitude estimated with Astrometrica is 13.2 with a coma of 24" (0'.4) corresponding to 18 pixels in diameter. What you see is a sum with a lot of contrast.
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