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IDProjectCategoryView StatusLast Update
0002302SkyChart2-Catalog datapublic20-04-23 18:24
ReporterSam Finn Assigned To 
PrioritylowSeverityminorReproducibilityalways
Status resolvedResolutionfixed 
PlatformMacOS10OS Version10.15.3
Product Version4.3 beta 
Target Version4.4Fixed in Version4.3 beta 
Summary0002302: NGC2652 (non-existent) shows adjacent to NGC2974
DescriptionCentering on NGC2974 shows NGC2652 as overlapping/adjacent. NGC2652 is a non-existent NGC. Selecting NGC262 shows it as also MCG+00-25-008, which is more properly the designation for NGC2974.
TagsNo tags attached.

Activities

Patrick Chevalley

20-03-18 22:00

administrator   ~0006396

This is the way it is in the original SAC 8.1 file:
|NGC 2652 |MCG +00-25-008 |GALXY|SEX|09 42.5|-03 42|11.9|99.9|231|12| 3.4 m| 2.1 m|40 |E 4 | ...
|NGC 2974 |MCG 0-25- 8 |GALXY|SEX|09 42.6|-03 42|10.9|13 |233|13| 3.4 m| 2.1 m|42 |Sa | ...

I not want to make any change to any catalog, other people already spend their life trying to fix NGC inconsistencies.

I suggest you change the catalog option in Setup /Catalog / CdC deep sky. Check "Open NGC" instead of SAC, this is the default for new installation of CdC. It contain much better coordinates for every object with modern value from Hyperleda and NED.
With this catalog NGC2652 is show as an unknown object at position 08h43m13s -03°36'45".

My printed RNGC show this same coordinates. I suppose SAC make the assumption there was a typo of one hour in the original NGC and this is in fact the same object.

Do Open NGC look better for you?

Sam Finn

20-03-22 22:48

reporter   ~0006399

Works for me. Thanks.

han

20-03-24 16:56

reporter   ~0006412

For my software I rely fully on the Wolfgang Steinicke's REV NGC&IC. NGC2652 is the same as NGC2974 ( or PGC27762) as indicated by SAC81. NGC2652 is also unknown in Simbad. So one an entry for a single object with three names NGC2974/NGC2652/PGC27762 would be best.

There is no object at 08h43m13s -03°36'45" so an entry for this position should be removed.

Han

Patrick Chevalley

20-04-23 18:24

administrator   ~0006531

Steinicke NGC is not bad but Open NGC is better in my opinion because it only rely on modern source like NED and Hyperleda and not care about all the history of this catalog.
Also Steinicke license do not allow the inclusion of the catalog as part of a Linux distribution.

I make a change to move the SAC to the obsolete catalog tab:
https://github.com/pchev/skychart/commit/34816c3e2ec34d78484fa1902df672761559a05b

Issue History

Date Modified Username Field Change
20-03-18 21:22 Sam Finn New Issue
20-03-18 22:00 Patrick Chevalley Status new => feedback
20-03-18 22:00 Patrick Chevalley Note Added: 0006396
20-03-22 22:48 Sam Finn Note Added: 0006399
20-03-22 22:48 Sam Finn Status feedback => new
20-03-24 16:56 han Note Added: 0006412
20-04-23 18:24 Patrick Chevalley Status new => resolved
20-04-23 18:24 Patrick Chevalley Resolution open => fixed
20-04-23 18:24 Patrick Chevalley Fixed in Version => 4.3 beta
20-04-23 18:24 Patrick Chevalley Target Version => 4.4
20-04-23 18:24 Patrick Chevalley Note Added: 0006531