September Objects

These are some show piece objects listed by object type, catalog number and constellation.


M57 (RING) Lyra
M27 (DUMBBELL) Vulpecula
M8 (Lagoon) Sagittarius with NGC6530 open cluster
NGC6826 (Blinking Nebula) Cygnus 19h 44.8 m, +50 deg 31 min
NGC7009 (Saturn Nebula) Aquarius 21h 04.2 m,  -11 deg 22 min
NGC7662 (Blue Snowball) Andromeda 23h 25.9 m,  +42 deg 33 min
NGC6818 (Little Gem) Sagittarius  18h 59.6 m,  -36 deg 38 min


M31/32/110 Andromeda
M33 Triangulum
NGC7331 Pegasus 22 h 37.1 m,   +34 deg 25 min


M13 Hercules
M92 Hercules
M15 Pegasus
M2  Aquarius
M10 Ophiuchus
M12 Ophiuchus
M14 Ophiuchus


NGC869 and NGC884 (Double cluster) Perseus 02 h 19.0 m, +57 deg 09 min
NGC6530 (with M8 - Lagoon) Sagittarius
NGC457 (Owl, Dragonfly or ET cluster) Cassiopeia  01 h 19.1 m, +58 deg 20 min
NGC7789 (Cassiopeia) 23 h 57.0 m, +56 deg 44 min
NGC6819 (Cygnus) 19 h 41.3 m,  +40 deg 11 min
M11 Scutum
M24 Sagittarius
M25 Sagittarius
M39 Cygnus
M29 Cygnus
M6 Scorpius
M7 Scorpius


This list comes from the "BEST MULTIPLE STARS" catalog by A.J. Crayon and Steven Coe version 1.0 dated 01-04-1990.

NAME     CON     RA (2000)   DEC   MAG   SEP     PA           NOTES

BETA     CEP      21 28.6       +70.5   3.5/8    14        250            W/B

a2816    CEP      21 39.0       +57.5   6/8/8    12/20   121/339   TRIPLE IN IC 1396

XI            CEP      22 03.6       +64.6  4.5/6.5    8         278            B/B

DELTA  CEP       22 29.2      +58.5    4/6.5      41      192            O/B

Additional notes from:

Chartrand, Knopf, "National Audubon Society Field Guide to the Night Sky", Chanticleer Press., New York, 1996, pp480,481

Beta Cephei - also called Alfirk, a name that may come from the Arabic term for "flock of sheep". This is a high contrast double. The brighter of the two is slightly variable. They are about 750 LYr away.

Xi Cephei - lies in the middle of the pentagram. These have similar brightness and color. They are about 120 LYr away.

Delta Cephei - prototype of the important class of variable stars called Cepheid Variables. Delta Cephei varies in brightness from mag 3.9 to 5.09 over a period of precisely 5.366341 days.

Cepheid variable stars are important to astronomers in calculating distances. Astronomers can even detect Cepheid variables in other galaxies. The absolute magnitude of a Cepheid variable is strictly related to its cycle of variation. The distance to the Cepheid variable can be calculated by comparing its absolute magnitude to the apparent magnitude.

Mu Cephei - NOT a double but worth looking at. Called the Garnet Star because of its deep red color through a telescope. It is the closest star to the north celestial pole of the planet Mars as serves as that planet's north star.

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Last updated February 4, 2018 by Brian Gray