Lovely job! Many thanks for clarifying this mystery. I was
originally imaging asteroids here and captured three images that all
showed it - not moving. I had turned displays to auto, but now they
are on.

Many thanks

Lawrence


--- In guide-user@yahoogroups.com, "Laville Bertrand"
<bertrand.laville@...> wrote:

>
> Hello Lawrence,
>
>
> here is the more info of the SECGPN for the object at this

location, from an extrafile I sent to Bill, some time ago:

>
>
>
> Strasbourg - ESO Catalogue of Galactic Planetary Nebulae (SECGPN)
> Acker+, 1992
> PNG 131.4-05.4
>
> Designation in PK67 131-05.1
> Main designation: BV 5-3
> Other identification(s): ARO 203
> Discoverer name and publication year: BOHM-VITENSE 1956
>
> RA (J2000): 1h53m02.51s
> Dec 2000: +56 24' 22.0"
>
> Optical diameter: 24.0 arcseconds
> (above value is uncertain)
> Size: 30 arcsecondes (a)
>
> Visual magnitude: 15.0 (a)
>
> Radial velocity: -59.0 +/- 25.0 km/s
>
> logarithm of the flux in H beta: -12.40 +/- 0.07 [mW/m2], in a

range [-15/-9]

> Intensity of emission lines, [range 0/15000], reported to H beta

line (486.1nm) taken as value 100:

> Line intensity of HeII at 468.6 nanometers: 87.0
> Line intensity of [OIII] at 500.7 nanometers: 671.0
> Line intensity of H alpha at 656.3 nanometers: 384.0
> Line intensity of [NII] at 658.4 nanometers: 144.0
>
> Data concerning the central star:
> B magnitude: 18.00
> For UBV see photometric bands
>
> Data concerning visual observations of the PN (a):
> Steve Gottlieb's observation: successfully seen with a 13" telescope
> Dr. Jack Marling's observation: successfully seen with a 17.5"

telescope

> Kent Wallace's observation: successfully seen with a 20" telescope
>
> Miscellaneous data:
> Constellation: Per
> Sky Atlas 2000.0 Chart number: 01
> Uranometria Chart number: 037
> SECGPN finderchart page: 199
>
>
> The Strasbourg-ESO Catalogue of Galactic Planetary Nebulae includes

1143

> true and probable PNs; 347 objects which status is (1982) unclear

were classified among

> "possible" PNs, and 330 objects have been rejected.
> The two latter categories are displayed by GUIDE in separated

catalogues.

> The designation system of the planetary nebulae of the SECGPN

follows the structure

> PN G111.1+22.2, where PN means "Planetary Nebula", G stands for

Galactic Coordinates,

> and 111.1+22.2 the galactic longitude and latitude respectively,

truncated to one decimal place.

>
>
> Some of the visual magnitudes were calculated by Dr. Jack Martling

using spectroscopic data.

> Most of the visual magnitudes were calculated by Owen Brazell using

Dr. Marling's equation,

> and are from O. Brazell's "A New Catalogue of Visual Magnitudes for

Planetary Nebulae", Webb

> Society Quartely Journal #104, April 1996.
> Additional magnitudes were provided by David Frew.
> (a): Data compiled by Kent Wallace, Planetary Nebulae, Revision 7,

16 may 2005

> (b): Data compiled by Kent Wallace, Nicknames, Revision 2, 23

september 2004

> (c): Data compiled by Kent Wallace, Notes, Revision 1, 16may 2005
> Kent Wallace, 7305 Sombrilla Ave, Atascadero, CA
> 93422, U.S.A. Ph 805-461-3310, E-Mail kwwallace@...
>
> more data on PNe at Blackskies
> more images of PNe at Planetary Nebula Image Catalogue
>
>
>
> Bertrand
>
>
>
> ----- Original Message -----
> From: Lawrence Harris
> To: guide-user@yahoogroups.com
> Sent: Saturday, December 29, 2007 3:01 PM
> Subject: [guide-user] Mystery object
>
>
> I invariably use Guide as my arbiter of what does or does not

exist. So what is

> it showing in my image(s) at RA 01-53-04 dec +56-24-18? It looks

like a

> circular nebula but nothing is shown in Guide. Nothing is shown

in the

> corresponding DSS image.
>
> regards
>
> Lawrence Harris
>
>
>
>
>
> --------------------------------------------------------------------

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