Messier 1 (catalog)
|Crab Nebula, Taurus A •NGC 1952 •LBN 833 •
|Position (epoch J2000)|
|Position|| Ra 05:34:31.9|
Photo by André Hartmann, RC-203/1624, 29 November 2011, Bischofsreut, Bavarian Forest
Sketch by Vedran Vrhovac, 200/1200 Dobson, 114, 10.5 mm Hyperion, FOV:36 ', 15 November 2006, LM: 5.4
|Central star mag.||16.5|
|Size||6' x 4'|
|Dreyer's description|| vB vL E 135° ± vglbM r
 How to find it
Messier 1 is situated in a rather dense star field.
 Telescopes up to 70mm, binoculars up to 50 mm, and finders
- (hr)Messier 1 with 10x50 binoculars by Ante Perković (NOT SEEN, Dec 23 2011, LM=6)
- (hr)Messier 1 with 10x50 binoculars by Ante Perković (NOT SEEN, Jan 12 2013, alt=65°, LM=5.8)
 Telescopes 71mm - 100mm (2.8" - 3.9"), binoculars 51mm - 70mm
At low power (25x-31x), in 75- to 80-mm refractor, or in 12x60 binoculars, M 1 is easily seen with direct vision as a oblong, small, (very) faint, diffuse oval patch of light, with no discernible details. With averted vision, it might appear brighter[234mm 1][100mm 1] and, under good conditions, even show some variations in brightness near the edge. [100mm 2][100mm 3]
- (hr)Messier 1 with 80mm f/5 refractor, 16x by Ante Perković (SEEN, Mar 23 2012, alt=44°, LM=5.5)
 Telescopes 101mm - 141mm (4" - 5.5"), binoculars 71mm - 100mm
Higher magnification might reveal more complex shape of nebula[141mm 8], but going over 100x propably won't bring any more details. With increasing power, nebula is becoming dimmer, but still can be seen at 220x.[141mm 4]
 Telescopes 141mm - 177mm (5.6" - 6.9")
In 6" telescopes, in very good conditions, averted vision might help you see some more details like streaks emanating from the center of the diffusion[177mm 1] or "feathery" edges[max 1]. The nebula apears elongated 1.8x1[max 1], with PA 130°[177mm 2].
- Messier 1 observation by Jeff Burton (x.astrogeek.org) with Meade LX200GPS 203mm SCT @ 75x, LM=5.0 to 6.3
 Telescopes 178mm - 234mm (7" - 9.2")
With 8" telescope, it is reportedly[234mm 2] seen under 4-mag skies as a "oval, grey blob". In better conditions, 8" will show pretty bright nebula, elongated in N-S direction, with brighter center[234mm 3] Higher power might show variations of brightness throughout the surface and along the edges.[234mm 1]
At 80x, "S" shape is visible, together with some hints of thin filaments.[234mm 4]
Hight power (170x) and UHC can bring a lot more details to an experienced observer, most notably many spots around the edge of the "S", that could be either unrelated stars or knots.[234mm 4]
It can show subtle shade of blue.[234mm 3]
- Messier 1 observation by Olivier Van Aelst @ deepskylog.be (with Celestron Advanced 200mm, 62x)
- (hr)Messier 1 with 8" (203mm) f/6 dobson homemade (by Beri) by Ante Perković (SEEN, Sep 10 2004, LM=6.1, 119x)
- (IAAC) Obj: M1 - Inst: 8" F4.4 Orion Optics Europa EQ5 Mount by David Woodford (from London!)
- (IAAC) Obj: M1 (NGC 1952) - Inst: 8" F/6 Dobsonian by Michael Geldorp
- (hr)Messier 1 with 8" (203mm) f/6 GSO dobson (Betsy) by Vedran Vrhovac (SEEN, Sep 10 2005, LM=5.7)
- (hr)Messier 1 with 8" (203mm) f/6 GSO dobson (Betsy) by Vedran Vrhovac (SEEN, Jan 19 2006, LM=5.6)
- (hr)Messier 1 with 8" (203mm) f/6 GSO dobson (Betsy) by Vedran Vrhovac (SEEN, Jan 22 2006, LM=5.5)
- (hr)Messier 1 with 8" (203mm) f/6 GSO dobson (Betsy) by Vedran Vrhovac (SEEN, Feb 18 2006, LM=5.7)
- (IAAC) Object: M1 - Instrument: 8" SCT f/10 by Bernhard Rems
 Telescopes 235mm - 305mm (9.25" - 12")
- Messier 1 observation and sketch by Juha Ojanperä with Newton 250/1200 (SEEN)
- (IAAC) 25cm Dobsonian, f/6, 48x, M1 by Michael Boschat
- Messier 1 observation by Hubert Hautecler @ deepskylog.be (with 25cm F/4.7 SkyWatcher newton (250 mm))
- (hr)Messier 1 with 12" (300mm) f/5 GSO dobson (Tristač), 143x by Vedran Vrhovac (SEEN, Dec 04 2007, LM=5.2)
- (hr)Messier 1 with 12" (300mm) f/5 GSO dobson (Tristač) by Vedran Vrhovac (SEEN, Jan 29 2008, LM=6.2)
- (hr)Messier 1 with 12" (300mm) f/5 GSO dobson (Tristač), 89x by Vedran Vrhovac (SEEN, Oct 01 2011, LM=6.4)
- (hr)Messier 1 with 12" (300mm) f/5 GSO dobson (Tristač) by Vedran Vrhovac (SEEN, Jan 26 2012, LM=5)
- (hr)Messier 1 with 12" (300mm) f/5 GSO dobson (Tristač), 143x by Vedran Vrhovac (SEEN, Mar 03 2013, LM=5.7)
- (IAAC) Obj: M1 Crab nebula - Inst: 10" f/6.5 Donsonian (50x, 130x+ LPR filter) by Paul J Henney
- (IAAC) Obj: M 1; NGC 1952 - Inst: 250mm f5.6 Dobsonian by Andrew Wood
- (IAAC) Obj: M45, M1, M108, M31 - Inst: 10" Cave Telescope (Super Custom Deluxe) Newtonian Reflector, Motorized Equatorial Mount by Andrew Reeves
 Telescopes above 12"
In 13" to 14.5" telescopes, at 150x and higher, nebula's structure is easily visible. Details than can be observed include mottling and ragged edges[max 2], very obvious irregular edge of the halo[max 3][max 4], filaments hints[max 2], and spiral forms in the brighter parts.[max 5]
UHC will further emphasize it, and will show a long bar in the center[max 2].
An indention on the eastern side of the nebula can be seen at high power (200x)[max 4].
The Crab pulsar can be seen at very high power[max 2], and is reportedly splitted from nearby star at 330x[max 1]. An experienced user using high power will also see low surface brightness filaments and faint nebulosity surrounding the main body of the nebula.
Many (but not all[max 6]) observers with 13" and bigger telescopes, report seeing many stars[max 5][max 7] involved in the nebula at high power, some of them as much as 7 stars, with 13"[max 1]. Stars are easily visible in northern part of the nebula.[max 8]
Higher power may also reveal dark streaks criss-crossing the nebula[max 5].
Color of the nebula has been described as blue-green.[max 7]
In 25" telescope, at high power, central bright region is elongated about 2x1 and contains 3 stars[max 1].
In very large telescopes (61"), using OIII filter, the net of filaments stands out from nebulosity.[max 2]
- (IAAC) Obj: M1 Crab Nebula - Inst: 12.5" F/4.8 dobsonian by Paul Money
- Messier 1 observation by Paul Kemp (Southern Sentinel) with 13.1" f/5 Dobsonian (98x) (20th October 2007)
- Messier 1 observation and sketch by Iiro Sairanen with Newton 406/1830mm
- Messier 1 observation by Peter Henderickx @ deepskylog.be (with 22" Dobson (560 mm))
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