apperantly was this object published on the NEO confirmaton page of MPC (Minor PLanet Center) named: BZ39121
After done the astrometric measurements, i saw that this image was an diffuse object with almost no central nucleus. It was difficult to get good astrometric data.
On the confirmation image i measure a coma of about 17 - 15 arc seconds but was not very accurate. data obtained from 7 co-added images of 120 sec. exposuretime each. The confirmationimages were taken remotely from Tzec Maun observatory in New Mexico with 0.4-m reflecter f/9 with clear filter and STL6303-camera. (MPC code H10)
The astronomical data were published in
MPEC 2011-K11 : COMET C/2011 J3 (LINEAR)Also my observation was added in the
IAUC 9209: C/2011 J3; C/2002 VQ_94 = C/2011 H1 [25317-2011/09-S1] (only for subscibers - password protected)
On the night of 20-21 may, i took 30 images of 180 sec. each from my own backyard - Brixiis observatory with 0.4-m corrected newton f/3.8 , ST10-XME and no filter (MPC code B96) . 24 images could be used for average-stacking. Here the same problem to get accurate astronomical measurements.
a coma could be measured of 13 arc.sec. (see image above - taken from my backyard observatory)
