... The Sun has come all of one day away from breaking its record for the longest period of inactivity for the last decade - reaching a mid-summer low and falling into yet another state of "hibernation". Yesterday, on the first day of autumn, new sunspots appeared on the surface of the Sun following an absence of almost 50 days. ... The first low lasted 51 days, from 21 July until 11 September last year. ... Now, almost a year later, it seems the Sun has hit a new low almost as "deep" as the first. ...

... Information about a variety of different calendars for different cultures (e.g., Christian, Jewish, Muslim, Chinese, Hindu etc.) ... In addition, the Chinese had two different ways of interpreting and observing celestial events. One way the Chinese used astronomy was known as lifa; it was a discipline that aimed to understand the regularities and the predictable events in the celestial system through careful, observations, measurements and records. ... back to Teachers' Newsletter Main Page ...

... Team . ... The main goal of observations of GRB host galaxies is accumulation of statistics of their spectroscopic and photometric properties. ... The Hubble diagram for 22 GRB host galaxies with known magnitudes and redshifts (GRB 970228, GRB 970508, GRB 970828, GRB 971214, GRB 980613, GRB 980703, GRB 990123, GRB 990510, GRB 990712, GRB 9912008, GRB 991216, GRB 000131, GRB 000210, GRB 000301C, GRB 000418, GRB 000911, GRB 000926, GRB 001109, GRB 010222, GRB 010921, GRB 011121 and GRB011211). ... 600...

SPACETELESCOPESCIENCEINSTITUTE SPACETELESCOPESCIENCEINSTITUTE Summary of FOC Activities for the period 10 August -- 8 September 1994 FOC Status . ... Calibration/Engineering Activities . ... 5136 A Color­Magnitude Array in the Bulge of M31 5138 A Color­Magnitude Array of NGC6397 5301 Structure and Populations of Globular Clusters 5644 UV Observations of Globular Clusters . ... 1994 SPACETELESCOPESCIENCEINSTITUTE Summary of FOC Activities for the period 10 August -- 8 September 1994 Other Activities . ...

The TIRGO NIR photometer uses a single InSb detector with cooled low-noise amplification electronics. Detector, filters, and diaphragms are cryogenically cooled to solid nitrogen temperature. ... FIRT gives the following choice of filters and diaphragms: . Results of the TIRGO calibration program: 1986-1987" L.K. Hunt, G.Calamai, and E. Oliva Arcetri Technical Report No. ... Manuale del nuovo sistema di controllo del Fotometro del TIRGO" C.Baffa Arcetri Technical Report No. ...

... Let be a random deviate which follows a Poissonian probability distribution about the expectation value . Although the Poisson distribution itself is only defined for integer , one can find the following continuous `envelope function' to the Poisson values: . ... where is the gamma function . ... The expectation value of is . ... Equation 5 is used both in the present program and in boxdetect to estimate the null-hypothesis probability distribution of the weighted sum of Poissonian images. ...

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Follow-up astrometry and recoveries are made with the ANU 40 inch (1.0-m) f/8 reflector at Siding Spring Observatory (IAU code 413). ... A routine follow-up of 2003 WY153 on 2003 Dec 15 became much more than routine when a faint object with unusual motion vector was found close to the target asteroid. ... During routine astrometry with the 1.0-m to improve the orbit of the Apollo asteroid 2004 CB, the asteroid was found on March 30 to have a short tail! ... Siding Spring Survey Main Page . ...