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star clusters
Abbreviations- M, million; K, thousand; LY, light years; Temp, temperature; RH, relative humidity; DP, dew point; NA, not applicable; FOV- field of view;
AU- astronomical units (1 AU = distance from Sun to Earth or 93 million miles).

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NGC 5466
NGC 5466 is a globular cluster in the constellation Bootes ~52,000 light years from Earth.  It is unusual in that it contains metal-poor stars. 
Object NGC 5466
Distance 52,000 LY
Constellation Bootes
Link
Date March 25 - 30, 2017 (Tucson, AZ)
Conditions Clear, Temp- ~55 F, RH- ~30%, DP- ~35 F
Moon Waning gibbous to waxing gibbous
Seeing 2.0 - 3.0 arc-sec
Telescope RCOS 12.5" Ritchey-Chretien @ f9
CCD camera SBIG STL11000M
Luminance 24 x 10 min; 1 x 1
Red 6 x 10 min; 2 x 2
Green 6 x 10 min; 2 x 2
Blue 6 x 10 min; 2 x 2
HA NA
FOV (width) 43.3 arc-min or 656 LY
Click here to see a larger version.
M2
M2, also called NGC 7089, is a globular cluster in the constellation Aquarius ~33,000 light years from Earth.  It is comprised of approximately 150,000 stars including red and yellow giants and 21 variable stars.  It is estimated to be ~13 billion years old and is one of the oldest globular clusters in the Milky Way. 
Object M2
Distance 33,000 LY
Constellation Aquarius
Link
Date November 08 - 10, 2014 (Tucson, AZ)
Conditions Clear, Temp- ~65 F, RH- ~30%, DP- ~35 F
Moon Waxing gibbous
Seeing 2.0 - 3.0 arc-sec
Telescope RCOS 12.5" Ritchey-Chretien @ f9
CCD camera SBIG STL11000M
Luminance 45 x 5 min; 1 x 1
Red 15 x 5 min; 2 x 2
Green 15 x 5 min; 2 x 2
Blue 15 x 5 min; 2 x 2
HA NA
FOV (width) 43.3 arc-min or 416 LY
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M15
M15, also called NGC 7078, is a globular cluster in the constellation Pegasus ~33,000 light years from Earth.  It is comprised of over 100,000 stars including 112 variable stars, 8 pulsars, and one double neutron star system.  It is estimated to be ~12 billion years old.
Object M15
Distance 33,000 LY
Constellation Pegasus
Link
Date November 08, 2013 (Tucson, AZ)
Conditions Clear, Temp- ~65 F, RH- ~30%, DP- ~35 F
Moon Waxing gibbous
Seeing 2.0 - 3.0 arc-sec
Telescope RCOS 12.5" Ritchey-Chretien @ f9
CCD camera SBIG STL11000M
Luminance 15 x 5 min; 1 x 1
Red 15 x 5 min; 2 x 2
Green 15 x 5 min; 2 x 2
Blue 15 x 5 min; 2 x 2
HA NA
FOV (width) 43.3 arc-min or 416 LY
Click here to see a larger version.

 

NGC 457
NGC 457, also called the ET cluster, is an open cluster in the constellation Cassiopeia 7,900 light years from Earth.  It is comprised of approximately 150 stars.  Many of them are B class stars meaning they are hot and blue.  A few redder stars can also be seen.  NGC 457 has an estimated age of 21 million years. 
Object NGC 457
Distance 7,900 LY
Constellation Cassiopeia
Link
Date November 14, 2013 (Tucson, AZ)
Conditions Clear, Temp- 65 F, RH- 34%, DP- 36 F
Moon Waxing gibbous
Seeing 2.0 - 3.0 arc-sec
Telescope RCOS 12.5" Ritchey-Chretien @ f9
CCD camera SBIG STL11000M
Luminance 12 x 2 min; 1 x 1
Red 12 x 2 min; 2 x 2
Green 12 x 2 min; 2 x 2
Blue 12 x 2 min; 2 x 2
HA NA
FOV (width) 43.3 arc-min or 100 LY
Click here to see a larger version.

 

NGC 663
NGC 663 is an open cluster in the constellation Cassiopeia 6,800 light years from Earth.  It is comprised of over 400 stars.  Many of them are B class stars meaning they are hot and blue.  Some of these B class stars are nearing the end of their main sequence lifespan.  A few redder stars can also be seen.  Click here to see a zoomed in field of view.
Object NGC 663
Distance 6,850 LY
Constellation Cassiopeia
Link
Date November 13, 2012 (Tucson, AZ)
Conditions Clear, Temp- 60 F, RH- 15%, DP- 12 F
Moon New moon
Seeing 2.0 - 3.0 arc-sec
Telescope RCOS 12.5" Ritchey-Chretien @ f9
CCD camera SBIG STL11000M
Luminance 12 x 5 min; 1 x 1
Red 6 x 5 min; 2 x 2
Green 6 x 5 min; 2 x 2
Blue 6 x 5 min; 2 x 2
HA NA
FOV (width) 43.3 arc-min or 86.4 LY
Click here to see a larger version.

 

M44- Beehive Cluster
M44, also known as the Beehive cluster, is an open cluster in the constellation Cancer 577 light years from Earth.  It is comprised of over 350 stars.  Many of them are B class stars meaning they are hot and blue.  The cluster also contains red giants and white dwarfs.  It is about 600 million years old.  Galileo was first to observe it with a telescope in 1609.
Object M44 (Beehive Cluster)
Distance 577 LY
Constellation Cancer
Link
Date January 29, 2012 (Tucson, AZ)
Conditions Clear, Temp- 54 F, RH- 37%, DP- 28 F
Moon Waxing crescent
Seeing 2.0 - 3.0 arc-sec
Telescope RCOS 12.5" Ritchey-Chretien @ f9
CCD camera SBIG STL11000M
Luminance 12 x 5 min; 1 x 1
Red 6 x 5 min; 2 x 2
Green 6 x 5 min; 2 x 2
Blue 6 x 5 min; 2 x 2
HA NA
FOV (width) 43.3 arc-min or 7.3 LY
Click here to see a larger version.

 

3C273 Quasar
3C273 is a quasar 2 billion light years from Earth.  Quasars look like stars but are really super massive black holes at the center of active galaxies. 3C273 has a luminosity one trillion times that of our sun (or 100 X that of our entire Milky Way galaxy). You can see a faint jet of gas extending to the left of 3C273.
Object 3C273
Distance 2,000 MLY (2 billion light years)
Constellation Andromeda
Link
Date June 06, 2008 (West Bloomfield, MI)
Conditions Clear, Temp- 81 F, RH- 10%, DP- 23 F
Moon New moon
Seeing 2.5 - 3.0 arc-sec
Telescope RCOS 12.5" Ritchey-Chretien @ f9
CCD camera SBIG ST10XME
Luminance 30 min; 1 x 1
Red NA
Green NA
Blue NA
HA NA
FOV (width) 21.8 arc-min or 12.7 MLY