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j21P/Giacobini-Zinner 
 
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Discovered by
Michel 
Giacobini, France on December,20 1900 and
Ernst Zinner, 
Germany on October,23 1913     
The
latest IAU telegrams or the
latest CBET's. 
IAUC
Astronomical Headlines. 
Minor 
planet center's orbital elements and Ephemeris,  
The comet on 
Seiichi Yoshida's Homepage,
Gary W. Kronk's Cometography 
Light 
curves on Cometas Obs, 
JPL Small body 
database 
 
          
21P/Giacobini-Zinner �
by Bernhard Haeusler, 2011-08-01 B/W          
 
3 x 5 min. exposure, 
2011-08-01 UT 21:13, 12" SCT 
f-6.5 + CCD ST10XME 
18.29 mag, coma: 10", tail: 6" in PA245       
 
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