What is this object in Leo?

For my first light using an Artemis 285 CCD camera
(http://www.artemisccd.co.uk/) I took some images of the Leo region using a
Pentax f1.4/50mm lens with the camera piggybacked on a telescope on a
Losmandy G11 mount. This was at approx 2200hrs UT on Friday 4th March. The
image is a stack of six 180 second exposures. Next morning I noticed some
nebulosity at one point, but SkyMap Pro shows no DSO or current comet at
this location. Does anybody know what this object is please?

Main image (351kB unfortunately, it won't stand any more compression) at:

http://homepage.ntlworld.com/john.mo..._annotated.jpg

This is a star field in Leo. The four brightest stars from left to right are
mu, epsilon, lambda and kappa Leo. The unknown object is ringed in black. It
corresponds with a star TYC 1960-1272-1 at position 09h 41m 52.74" +23deg
49m 11.1". The object is also visible in a stack of 10 second exposures, at:

http://homepage.ntlworld.com/john.mo...0secs_part.jpg

which shows a cutdown view of the same area.

I've been waiting for another clear night to repeat the exercise with a
larger lens, but to no effect, hence my post to this group. I suppose it
could be some contamination on the CCD, but I certainly can't see any. Can
anyone help please?

John Moore
Fleet, Hants, England

There is a mag 10 star in that position


Visual magnitude: 10.27

Tycho catalog number: TYC 1960-1272-1

On Wed, 16 Mar 2005 10:18:59 GMT, "John Moore"
wrote:

For my first light using an Artemis 285 CCD camera
(http://www.artemisccd.co.uk/) I took some images of the Leo region using a
Pentax f1.4/50mm lens with the camera piggybacked on a telescope on a
Losmandy G11 mount. This was at approx 2200hrs UT on Friday 4th March. The
image is a stack of six 180 second exposures. Next morning I noticed some
nebulosity at one point, but SkyMap Pro shows no DSO or current comet at
this location. Does anybody know what this object is please?

Main image (351kB unfortunately, it won't stand any more compression) at:

http://homepage.ntlworld.com/john.mo..._annotated.jpg

This is a star field in Leo. The four brightest stars from left to right are
mu, epsilon, lambda and kappa Leo. The unknown object is ringed in black. It
corresponds with a star TYC 1960-1272-1 at position 09h 41m 52.74" +23deg
49m 11.1". The object is also visible in a stack of 10 second exposures, at:

http://homepage.ntlworld.com/john.mo...0secs_part.jpg

which shows a cutdown view of the same area.

I've been waiting for another clear night to repeat the exercise with a
larger lens, but to no effect, hence my post to this group. I suppose it
could be some contamination on the CCD, but I certainly can't see any. Can
anyone help please?

I agree that the position is co-incident with TYC 1960-1272-1 John.

I took a shot at Tempel 1 a few weeks ago and came up with a fuzzy
where there should have been a star. On closer investigation, I
eventually found it catalogued as a "non-star"!

Interestingly, there appears to be a similar object at about 10:30
from HD83469 on your image.

--
Pete
http://www.digitalsky.org.uk

Pete,

I took a shot at Tempel 1 a few weeks ago and came up with a fuzzy
where there should have been a star. On closer investigation, I
eventually found it catalogued as a "non-star"!

So what does that mean?

Interestingly, there appears to be a similar object at about 10:30
from HD83469 on your image.

I think you mean HD82175 (TYC1962-754-1). I see it, but am not so
convinced. I'm wondering if it's an excess of infrared that is causing it?

John Moore

On Wed, 16 Mar 2005 11:23:30 GMT, "John Moore"
wrote:

Pete,

I took a shot at Tempel 1 a few weeks ago and came up with a fuzzy
where there should have been a star. On closer investigation, I
eventually found it catalogued as a "non-star"!

So what does that mean?

At a guess, it's not a star ;-) ! To be honest, I don't rightly know!
I presume it's something that's been auto-catalogued as a star but has
subsequently been found not to be one.

Interestingly, there appears to be a similar object at about 10:30
from HD83469 on your image.

I think you mean HD82175 (TYC1962-754-1). I see it, but am not so
convinced. I'm wondering if it's an excess of infrared that is causing it?

Yes (went off track a bit there didn't I!). The actual object I'm
referring to being TYC 01962-1000 1. Might be worth checking to see
if there's any commonality between the two stars that show the effect.

--
Pete
http://www.digitalsky.org.uk

"John Moore" ha scritto nel messaggio
...


I think you mean HD82175 (TYC1962-754-1). I see it, but am not so
convinced. I'm wondering if it's an excess of infrared that is causing it?

John Moore

It may be, but in general infrared makes stars more sloppy but round. Try to
image a known IR-emitter and compare the pics. My CdC edition shows no DSOs
close to that star. Could you check on the DSS or USNO catalogs?

--
--
Beta Persei
45° 35' N
08° 51' E

Remove "_nospam" to reply

I cant see anything like this in the region on the DSS, and nothing
listed in Simbad.

There is a suspect variable in the area NSV4582 classified as M6.

Follow-up observation required, or perhaps someone else imaged this
area the same night ?

Callum

"John Moore" wrote in message
...
Pete,

I took a shot at Tempel 1 a few weeks ago and came up with a fuzzy
where there should have been a star. On closer investigation, I
eventually found it catalogued as a "non-star"!

So what does that mean?

Interestingly, there appears to be a similar object at about 10:30
from HD83469 on your image.

I think you mean HD82175 (TYC1962-754-1). I see it, but am not so
convinced. I'm wondering if it's an excess of infrared that is causing it?


Hi John,

I would say unless you were using an IR block, unfocussed IR is a definite
possibility. TYC 1960-01272-1 is listed in USNO B1 as Bmag 10.95 Rmag 9.46
Imag 8.77

Robin

Looks like its:

Variable Star

4582 NSV 4582 S 7582

Type of Variability: LB NSV

Magnitude: P 10.00/ 10.50

J2000 RA: 9h41m33.91s DE:+23°50'34.8"

Although your quoted RA position seems a bit off. No known comets in the
area.

Regards

Chef!

"Chef!" wrote in message
...
Looks like its:

Variable Star

4582 NSV 4582 S 7582

Type of Variability: LB NSV

Magnitude: P 10.00/ 10.50

J2000 RA: 9h41m33.91s DE:+23°50'34.8"

Although your quoted RA position seems a bit off. No known comets in the
area.


AKA TYC 1960-1272-1 as already identified - It doesn't explain its odd
appearence though. The B-V is 1.2 so it is rather red.

Robin