Constellation of the Month: September
Aquila (The Eagle), Equuleus (The Little Horse), and Sagitta (The Arrow)

by: John Mirtle.
Page last updated: May 3, 2004

Contents
Small Scope Objects    Big Scope Objects    Challenge Objects    Maps    Photos

Small Scope Objects:

Name R.A. Decl. Details
  B142, B143 19hr 41m +10° 57' "Barnard's E" - located west of g Aquilae. A pair of dark nebula, easy in binoculars from a dark site, large at 80 x 50 arc minutes. (Aql)
  NGC 6709 18hr 51m +10° 20' A mag 8 open cluster of 40 stars, 12 arc min diameter. (Aql)
  M71
(NGC 6838)		 19hr 53.8m +18° 47' A bright, loose globular cluster glowing at mag. 8.3, easily resolved with larger scopes. Mag. 7.7, 7.2 arc minutes across. Stars are 12th mag. and fainter, for an integrated magnitude of 8.3. (Sge)
  H 20 19hr 53m +18° 20' "Harvard 20" - a small open cluster 1/2° SSW of M71. This small cluster of 15 stars, mag 9.8 and fainter, is only 7 arc minutes in diameter and shines at mag. 7.7 (Sge)
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Big Scope Objects:

Name R.A. Decl. Details
  NGC 6781! 19hr 18.4m +06° 33' A large planetary nebula, 109 arc sec across. Fairly low surface brightness at mag. 11.8, but responds well to LPR filters. (Aql) (110NGC)
  NGC 6886 20hr 13m +19° 59' A bright 12th magnitude planetary nebula, but only 4 arc seconds in size. "Blinking" with an OIII filter will help detect this nebula under poor seeing conditions. Central star m15.7 (Sge)
  NGC 6804 19hr 32m +09° 13' A fairly bright planetary, at mag 12.2. 31 arc sec. in diameter. Mag 13 central star. (Aql)
  NGC 6751 19hr 06m -06° 00' A small "Ring Nebula", 20 arc sec. across, mag 12.5 with a central star of about mag. 13. (Aql)
  NGC 6814 19hr 43m -10° 19' A compact face-on spiral galaxy. 3x2.7 arc min, mag 12.2. (Aql)
  NGC 6879 20hr 10m +16° 55' A bright but small planetary, only 5 arc sec across. Mag 13. (Sge)
  NGC 7046 21hr 15m +02° 50' Difficult SB galaxy in smaller scopes, mag 13.8. 1.9x1.3 arc min(Equ)
  NGC 6755 19hr 08m +04° 14' Open cluster of 50 stars, mag 12 and fainter. 10 arc min in diameter. Look for fainter cluster NGC 6756, 28 arc min. N.E., mag 10.5, 3 arc min diameter. (Aql)
  NGC 6760 19hr 11m +01° 02' A compact globular cluster, only 2 arc minutes across. Mag 11. (Aql)
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Challenge Objects:

Name R.A. Decl. Details
  Palomar 10 19hr 18m +18° 34' A faint class 12 globular cluster. Mag 13.2, 3.2 arc minutes in diameter. Use good skies, clean optics, high power, observing hood, parabolic steroids, a big scope, etc. (Sge)
  Palomar 11 19hr 45m -08° 00' One of the 'easier' Palomar clusters at mag. 9.8, 3.5 arc minutes in diameter. (Aql)
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Constellation Maps:

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Photos:

 
Photo 1
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