Nebula Magnitude?

Hi,

As a newbie I am confused with Red Shift 5. 8-(

I looked at the magnitude on Bode's Nebula which is listed as +6.93.

Then opened the visibilty windown in Red Shift and noticed that the
magnitude was listed as +24.9?

I am obviously missing something here, surely the magnitude cannot
vary that much?

Martin

In message , Martin Shaw
writes
Hi,

As a newbie I am confused with Red Shift 5. 8-(

I looked at the magnitude on Bode's Nebula which is listed as +6.93.

Then opened the visibilty windown in Red Shift and noticed that the
magnitude was listed as +24.9?

I had to look up Bode's nebula! (Skymap Pro tells me it's M81) Giving a
magnitude to 2 decimal places is wildly excessive unless you say
precisely where you are drawing the line, but it's obvious Red Shift is
doing something wildly wrong - wouldn't be the first time.
The Saguaro Astronomy Club database lists it at 6.9 but Skymap also
lists B and V magnitudes of 7.8 and 7.
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Hi Jonathon,

Thanks for the info.

I assume then that Red Shift can be a bit inaccurate at times
then? 8-((

Regards,

Martin

"Martin Shaw" wrote in message
...
Hi,

As a newbie I am confused with Red Shift 5. 8-(

I looked at the magnitude on Bode's Nebula which is listed as +6.93.

Then opened the visibilty windown in Red Shift and noticed that the
magnitude was listed as +24.9?

I am obviously missing something here, surely the magnitude cannot
vary that much?

Martin

I looked up M81 on Cartes Du Ciel and it gave a magnitude of 6.9 as you
reported, but it also said that the angular size was 11.5' x 24.9' Is it
possible that you mis-read the angular size as the magnitude?

Just a thought.

Owen