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Messier 84
Observations and Descriptions
Discovered by Charles Messier on March 18, 1781.
- Messier:
M84.
- March 18, 1781. 84.
12h 14m 01s (183d 30' 21") +14d 07' 01"
"Nebula without star, in Virgo; the center it is a bit brilliant, surrounded
with a slight nebulosity: its brightness & its appearance resemble that
of those in this Catalog,
No.s 59 & 60."
- William Herschel
-
[1811: PT Vol. 1811, p. 226-336; here p. 290-291]
12. Of the remarkable Situation of Nebulae.
The number of compound nebulae that have been noticed in the foregoing three
articles [on multiple nebulae] being so considerable, it will follow, that it
they owe their origin to the breaking up of some former extensive
nebulosities of the same nature with those which have been shewn to exist at
present, we might expect that the number of separate nebulae should far
exceed the former, and that moreover these scattered nebulae should be found
not only in great abundance, but also in proximity or continuity of each
other, according to the different extents and situations of the former
diffusions of such nebulous matter. Now this is exactly what by observation,
we find to be the state of the heavens.
In the following seven assortments we have not less than 424 nebulae; [..]
(*) [1st assortment] See sixty-one nebulae. [including M84]
[Unpublished Observations of Messier's Nebulae and Clusters.
Scientific Papers, Vol. 2, p. 659]
1784, Apr. 17 (Sw. 199). A bright nebula. [The only observation - Dreyer]
- John Herschel (1833):
h 1237.
- h 1237 = M84.
Sweep 192 (May 4, 1829)
RA 12h 16m 26.2s, NPD 76d 10' 9" (1830.0)
[Right Ascension and North Polar Distance]
v B; R; p s b M; 60"; r
Very bright; round; pretty suddenly brighter toward the middle; 60"
[diameter]; mottled.
- Smyth
- [from the description of M88]
[has it in a chart]
.. "in the immediate nebulous neighborhood" of 88 Messier ..
- John Herschel, General Catalogue:
GC 2930.
- GC 2930 = h 1237 = M84.
RA 12h 17m 57.6s, NPD 76d 20' 8.7" (1860.0)
[Right Ascension and North Polar Distance]
vB; pL; R; psbM; r.
2 observations by W. & J. Herschel.
Very bright; pretty large; round; pretty suddenly brighter toward the middle;
mottled.
- Dreyer:
NGC 4374.
- NGC 4374 = GC 2930 = h 1237; M 84.
RA 12h 17m 58s, NPD 76d 20.2' (1860.0)
[Right Ascension and North Polar Distance]
vB, pL, R, psbM, r; = M84
Very bright, pretty large, round, pretty suddenly brighter toward the middle,
mottled.
Remark:
4374. GC 2932-40. Ld R [Lord Rosse] novae. "12 knots examined."
h and H [J. & W. Herschel] have more than 12 nebulae between 12h 18m-21m
and [PD] 76d to 77d, so there does not appear to have been sufficient reason
for introducing these nine "novae" in the G.C.
- Curtis
- [Descriptions of 762 Nebulae and Clusters photographed with the Crossley
Reflector. Publ. Lick Obs., No. 13, Part I, p. 9-42]
NGC 4374, RA=12:20.0, Dec=+13:27.
Very bright; round, 1' in diameter. Center large. No spiral structure
discernible.
Observing Reports for M84 (IAAC Netastrocatalog)
Hartmut Frommert
Christine Kronberg
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Last Modification: February 10, 2004