Observation by Mazin Younis: James Webb Space Telescope

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Mazin Younis

Observer

Mazin Younis

Observed

2022 Sep 30 - 01:00

Uploaded

2022 Sep 30 - 14:44

Objects

Spacecraft

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Constellation

Pegasus

Field centre

RA: 23^h26^m
Dec: +13°33'
Position angle: +55°02'

Field size

0°46' × 0°33'

Equipment

Esprit 100ED Pro
ASI 294MC-Pro

Exposure

33 frames @ 300s (2:45hrs)

Location

My remote telescope, Morocco

Target name

James Webb

Title

James Webb Space Telescope

About this image

Orbiting around L2 point, it may be the only object in deep sky that doesn't travel at straight line, as seen by observers on earth.

Of course we are looking at the protective large shield of JWST.

Files associated with this observation

James_Webb_marked.jpg (379.5 kB)

Like this image

David Strange, Nick James, Jeremy Shears, Manolo_Rodriguez, Dr Paul Leyland, Dominic Ford, Gerard Cauchi, James Weightman, Mike Harlow, Philip Jennings, Chris Hooker

Comments

Nick James, 2022 Sep 30 - 16:12 UTC

Great image. Good to see that you are keeping an eye on it!

You are right that JWST is in a sort of orbit around L2 but this has a period of 6 months so you wouldn't see any curvature due to that in a period of a few hours.

Most of that apparent motion will be due to the rotation of the earth and that is why the trail is curved rather than straight. If you think about it the earth's diameter is 12,800 km and JWST is 1.5 million km away so the maximum daily parallax is quite large (12,800/1,500,000 = 0.008 rad which is around half a degree). That is also the apparent diameter of the earth as seen from JWST.

Mazin Younis, 2022 Oct 01 - 02:02 UTC

Many thanks Nick for enlightening me about the dynamics of JWST, amazing to "see" the parallax due to earth's rotation :)

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