Objects reported by others, but not verified by Messier
In an appendix to his catalog, Messier lists
his attempts to observe objects which were previously reported by other
astronomers, but which he looked for in vain. This appendix appeared in
both his publications in the Connaissance des Temps, in 1780 (for 1783)
and 1781 (for 1784) as well as the reprint of the latter.
This is a translation of his final version of 1781, and is leaned to that of
Kenneth Glyn Jones, published in his book,
Messier’s Nebulae and Star Clusters.
Nebulae discovered by different astronomers, which M. Messier has looked for
without success
Hevelius, in his
Prodome d’ Astronomie, reports the position of a nebula,
placed above the top of the head of Hercules, having R.A. 252d 24′ 3″ and
Dec. N 13d 18′ 37″.
On June 20, 1764, in a good sky, M. Messier looked for this nebula without being
able to discover it.
Hevelius, in the same work, reports the positions of four nebulae; one on the
forehead of Capricorn, the second preceding the eye, the third following the
second, and the fourth above them and attending the eye of Capricorn:
M. de Maupertuius reported the positions of these four nebulae in his
Discours sur la Figure des Astres, 2nd edition, page 109.
M. Derham mentions them also in his Memoire printed in the
Philosophical Transactions, No. 428, p. 70. One also finds these nebulae on many
planispheres and celestial globes.
M. Messier looked for these four nebulae on July 27, August 3, and
October 17 and 18, 1764, without being able to discover them, and he doubts
they exist.
In the same work, Hevelius reports the positions of two other nebulae, one on
the near side of the star which is above the tail of Cygnus, and the other on
the far side of the same star.
On October 24 and 28, 1764, M. Messier looked carefully for these two nebulae
without being able to find them. M. Messier clearly saw at the end of the tail
of Cygnus, the star pi, a cluster of small stars
[M39], but the position he determined was
different from that which Hevelius reported in his work.
Hevelius also reported in the same work the position of a nebula situated in the
ear of Pegasus.
M. Messier looked for it in fine weather, in the night of October 24 and 25,
1764, without being able to find it, unless it is the same as the nebula which
M. Messier has observed between the head of Pegasus and that of Equuleus. See
No. 15 in his catalog.
M. l’Abbe de la Caille, in his Memoir on the
nebulae of the southern pole,
printed in the volume of the (Memoirs of the) Academy of 1755, p. 194, reports
the position of a nebula which resembles, he said, the small nucleus of a comet;
its Right Ascension as of Jan. 1, 1752, is 18d 13′ 34″ and its Declination
S 33d 37′ 5″.
On July 27, 1764, in an entirely serene sky, M. Messier lloked for this nebula
in vain: perhaps the instrument which M. Messier employed was not sufficient to
find itIt was later seen by M. Messier. See No. 69.
M. de Cassini reported in his Elements of Astronomy, p. 79, that his
father discovered a nebula in the area between Canis Major and Canis Minor and
which was one of the finest to be seen in the telescope.
M. Messier looked several times for this nebula in a serene sky, without being
able to find it, and he presumes it might have been a comet just becoming
visible or disappearing, for nothing resembles a nebula more than a comet which
is just becoming visible in an instrument.
In the great Catalog of Stars by Flamsteed, there is reported a position
of a nebula situated in the right leg of Andromeda, having R.A. 23d 44′ and
polar distance 50d 49′ 15″ (Dec N 39d 10′ 45″).
M. Messier looked for it on October 21, 1780 with his achromatic telescope
without being able to find it.
Last Modification: 7 Feb 1998, 18:10 MET