... We had a unique diagnostic tool for determining whether or not the secondary was fractured during the dark run in that we had 3 sets of focus sweep data for the imaging camera taken on the nights of 05 October 1999, 11 October 1999, and 14 October 1999. ... Figure: 05 October 1999, CCD g1 . ... Surface plot. ... Figure 32 plots the same data but for CCD g3. ... Figure: Comparison of normalised brighness for the out-of-focus doughnuts for the nights of 05, 11, and 14 October 1999 for CCD g1. ...

... The Same Color Illusion . ... The above illusion, called the same color illusion, illustrates that purely human observations in science may be ambiguous or inaccurate. ... Old Faithful Moon . ... Scheduled to illuminate the landscape throughout the night tomorrow, October's bright Full Moon will also be called the Harvest Moon. ... Comet and Orion . ... These colorful panels both feature a familiar northern hemisphere astronomical sight: the stellar nursery known as the Great Orion Nebula. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . Planets . ... Monthly Sky Notes . ... February . ... The ringed planet will be quite bright, but unlike Jupiter it will not be the brightest point of light in the sky, this accolade will return to Sirius which is the brightest star in our night sky in the constellation of Canis Major. ... Seven days later on February 18, the Moon will be in its full Moon phase. ... Tweets that mention Wonders of the February Night Sky | ... Astronotes . ...

... Up: Data Analysis and Processing Techniques . ... Also, a method for quality control of CCD observations is suggested. ... Everyone who observes a celestial object using a CCD detects moving celestial objects as a ``by product''. ... We hope that our investigations may be useful for near-Earth space control and also for searches of the moving celestial objects through analysis of old and new CCD frames obtained at any amateur or professional astronomical observatory. ...

... 27 May-1 June, 1993 (6 nights) Calar Alto, 1.23m. Calamai + Richichi . ... 28 June-4 July, 1993 (7 nights) Calar Alto, 1.23m. Richichi + Stecklum . ... 20-27 December, 1993 (8 nights) Calar Alto, 1.23m. Leinert + Richichi . ... 18-24 February, 1994 (7 nights) Calar Alto, 1.23m. Richichi + Stecklum . ... Photometry: only standards on 16th (SL9 run). ... 12-16 January, 1995 (5 nights) Calar Alto, 1.23m. Richichi + Stecklum . ... 18-22 November, 1996 (5 nights) Calar Alto, 1.23m. Fabbroni + Richichi . ...

... Main mirror of the radio telescope consists of 36 groups with 25 elements of each one. ... Size of a element 11.5 x 2 m. Thus total geometric area of the main circle is equal to 20000 m in square. Southern sector (nine 26-35 groups) are driving with new automatic system of the. ... Simultaneosly Southern sector could used for observations with Flat mirror. ... The asimuthal observations are possible with system: Flat mirror and Southern sector and feed-cabine #3 at arc-rail-ways. ...

Twilight observations with MASS/DIMM B. Safonov Sternberg Astronomical Institute Moscow State University Comprehensive Characterization of Astronomical Sites, 2010 B. Safonov (Moscow State University) Twilight observations with MASS/DIMM SITE 2010 1 / 17 Why observe in twilight with MASS/DIMM? ... ASM includes 3 devices sensitive to background: guider, DIMM and MASS. B. Safonov (Moscow State University) Twilight observations with MASS/DIMM SITE 2010 2 / 17 Background in guider. ...

... Advises . Contact Advises . As an advise for amateurs we would like to underline: if it's possible, try to observe 3 asteroid positions per night and do not neglect to observe the Numbered Minor Planets in your telescope field of view as a "by product" of your observational programs. ... We think such estimations ought to be produced every morning after CCD observations of the moving celestial objects by observer himself. ...