Blue Racquetball (NGC 6572)
This plantetary nebula was discovered on 18 July 1825 by the German born astronomer Friedrich Georg Wilhelm Struve using the 9.6 inch f/17.8 Fraunhofer refractor at Dorpat Observatory in Russua (today called Tartu in Estonia). 
NGC 6572 is a pretty young planetary nebula, estimated only a few thousand years old. As a result the glowing gas is still quite concentrated, which explains why it is abnormally bright. It expands at a speed of around 15 km/s.  The distance is estimated to 1736 pc. 
|Designations||PN G034.6+11.8: NGC 6572, PK 34+11.1, ARO 7, VV 159, VV' 370|
|Right Ascension (J2000.0)||18h 12m 07s|
|Declination (J2000.0)||+06° 51' 25"|
|Dimensions||10.8" (optical), 8." (radio)|
|Radial Velocity||-8.5 km/s ± 0.4 km/s|
|Expansion Velocity||16.0 km/s (O-III), 16. km/s (N-II)|
|C-Star Designations||AG +6 2201, AG82 296, BD +06 3649, EM* CDS 964, GCRV 10650, HD 166802, PLX 4174|
|C-Star Magnitude||13.10 mag (B filter)|
|C-Star Spectral Type||Of/WR(H)|
The planetary nebula NGC 6572 can be found in the constellation Ophiuchus (Serpent Bearer). The best time for observation is March through August.
Description pending ...