sponsored by psychohistorian.org

DOCdb

Deep Sky Observer's Companion – the online database

 

Welcome, guest!

If you've already registered, please log in,

or register an observer profile for added functionality.

List:

log in to manage your observing lists

 browse:

 

 position:

 

 next:

 

 options:

summary

rename

prune

trim

remove

close

copy

combine

plan

bookmark

load

new

delete

marathon

favourite!

Full database:

Entire DOCdb database of 18,816 objects.

 browse:

 position:

NGC 5747 (12,637 of 18,816)

 next:

oc gc pln bn dn gx gxcl ast aka lost

Object:

list

bookmark

finder chart

altitude today

altitude (year)

 search:

½°, , in DOCdb

show browsing

NGC 5747

NGC 5747, IC 4493, LEDA 52638, MCG+02-38-002, UGC 9496, III 48, GC 3988

RA: 14h 44m 20.94s
Dec: +12° 07′ 55.1″

Con: Bo÷tes
Ch: MSA:718, U2:198, SA:14

Ref: SIMBAD

(reference key)

Type: galaxy (in pair), S

Mag: B=14.4, V=?

Size: 0.891′ x 0.776′
PA: 169°

History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

NGC 5747 = IC 4493. WH's single discovery observation is about 50 seconds of time too far east. Bigourdan looked for NGC 5747 at WH's position and of course saw nothing. He did find the object, however, and measured it twice. He included it in his 4th list of new nebulae, so it received a number in the second IC. Herschel's note on the object, quoted by Dreyer in the 1912 reprinting of Herschel's papers, reads, "An extremely faint nebula, it is small and required some time to look at before it could be well seen." This helps to explain the position error, but errors of this size are not unknown in others of WH's observations.

Historical observations

William Herschel (c.1784)

Synonyms: H III-048

Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "eF ... an eF neb., it is S and required some time to look at it before it could be well seen." Dreyer notes that it was not found twice by Bigourdan.

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 14.5 mag galaxy. Their coded description reads IRR,HISB,FDIF APPS.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

Named DSOs

Object search

First search phrase

    and

Second search phrase

Type of object to include:

open cluster
globular cluster
planetary nebula
bright nebula
dark nebula
galaxy
galaxy cluster
asterism & stars
unverified/lost
nova

The Bug Report

DOCdb is still in beta-release.

Known issues, feature requests, and updates on bug fixes, are here:

> Bug Report

Feedback

Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!

> Contact us

Help!

DOCdb is a free online resource that exists to promote deep sky observing.

You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.

> Find out more

Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.