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NGC 6165 (18,752 of 18,816)

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NGC 6165

NGC 6165, Ced 135b, h 3634, GC 4207

Remarks

See NGC 6164.

Historical observations

John Herschel (1847) Cape Observations

Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "F, S, lE, vglbM, 35 arcseconds, certain; follows a double star."

Published comments

Cederblad, S. (1946) [VII/231]

Ced 135b (NGC 6165)

Position (1900): RA 16 26.6, Dec - 47 56

Star: -47 10855 (Mp=6.7:, V=6.89, SpT=B0)

Spectrum of nebula: emission spectrum (inferred from sp.t. of exciting star)

Classification: Neb associated with mainly one star (which may be multiple) - star surrounded by a neb envelope without conspicuous structure (eg. lambda Scorpii)

Size: (not given)

Notes: "Ced 135 Two nebulae found by John Herschel in 1834 near -47 10855 = HD 148937 = Boss 22246. R. This star is probably responsible for the nebular light. Ced 135 b = NGC 6165 = GC 4207 = h 3634."

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a planetary nebula.

Modern observations

Bahr-Vollrath, Gerd (1992)

Gerd Bahr-Vollrath (Noosa Heads, Queensland, Australia) observing with an 8-inch f/12 SCT, writes in the The Webb Society Nebulae and Clusters Section Report No. 10, July 1992: "One of the sadly ignored southern gourmet objects. Of particular interest is the fact that we are looking at a Wolf-Rayet shell, a rare object by any standards. It is difficult to spot, as the faint nebulosity surrounds a 6th magnitude star. Clean optics and an extremely transparent night were necessary to see anything at all. Immediately visible were two, apparently disconnected, bars of nebulosity, NW and SE of the central star, hence the two NGC designations. After careful study, faint, indistinct nebulosity immediately surrounding the central star became visible, connecting the two brighter bars. A challenging object!"

Contemporary observations

Richard Ford

2011 April, 30th, Saturday

Location:Perdeberg.

Instrument:12-inch Dobsonian Reflector Telescope.

Sky Conditions:The fainter parts of the Milky Way are barely visible.

Transparency of the Sky:Haziness only visible on the horizon.

Seeing:Atmosphere stable with little interference.

Limiting Magnitude:4.9.

NGC 6165

--------

Object:Nebula.

First Impression:This object looks like an emission nebula.

Location:Norma.

Time:11:30pm.

Chart Number:No.147(Extract taken out of "Atlas of the Southern Sky").

Size:26mm Super Wide Field Eyepiece:Field Of View:57'/3=19'.

20mm Ultra Wide Angle Eyepiece:Field Of View:50'/2.5=20'

19'+ 20'= 39'.

39'/2= 19.5'.

Size in Arc Minutes: 19.5'.

Ratio:1:3.

Major Axis:19.5'.

19.5'/3= 6.5'.

Minor Axis:6.5'.

Nebula is 19.5'* 6.5'.

Brightness:Magnitude 7.

Brightness Profile:From the far outskirts of this nebula the central star grows slightly brighter.

Challenge Rating:Difficult.

Description

-----------

This nebula is arranged in the shape of an unusual S.This nebula is made up of blue to blue-white stars which gives light to this nebula.I have also found some dark lanes and patches in this nebula.I have on the other hand have found two hotspots either side of the star.

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