... Dear FIRPO friends, I have quickly looked at the data freshly sent by Bringfried after his run at the 1.23m in the current situation of "poor" (to say the least) mirror. I have measured the SNR on two stars: V Sp K(assumed) SNR ------------------------------- 7.9 K4/5 4.5? ... For comparison, my experience from two seasons ago at the 1.23m was that the limit was K=7.5 for SNR=1. So at least for faint stars, it seems that the situation with the mirror does not preclude useful work. ...

... These are the filter transmission, the field of view (determined by the NICMOS optics external to the dewar, in combination with the HST mirrors), the reflectivities of the various external mirrors and the transmission of the dewar window. ... The sensitivity will obviously be affected by the pixel field of view. ... Finally, the optical efficiency will be degraded further by the reflectivities of the aluminum with MgF 2 overcoated HST primary and secondary mirrors. ... Primary mirror temperature . ...

Next: Release of 1 Aug. Up: Old Releases Previous: Release of 18 Nov. ... Fixed 5 Aug 1997. RCW. ... 5 Aug 1997. ... Because of the digital patch panel at the VLA and the effort by sched to understand which IFs are needed to support the specified phasing modes (VL, VR, and VA), CHNSTA is no longer needed. ... Add barrel=roll_off to the vsop setup files. ... 15Aug1997. ... Protect against requesting VLBI in non-VLBI modes at the VLA. ... Fixed keeping track of use of VLA modes. ...

... Preliminary results demonstrated uncorrected DSB noise temperature of the Nb-AlN-NbN SIR below 250 K at frequencies around 600 GHz August 30, 2006 ASC-2006 Seattle Nb-AlN-NbN SIR 3EG08 2 TELIS - TErahertz LImb Sounder TELIS Objectives: Measure many species for atmospheric science (ClO, BrO, O3, HCl, HOCl, etc); ...

Figure 10. The circles show the thermal defocus corrections that were observed on August 15, 2000. These data were derived by combining the defocus measurements seen in Figure 6 with the thermal measurements of the truss seen in Figure 7. ... I then fit the thermal defocus data given by the circles above using only the thermal time constant and an arbitrary "zero-point" constant as fit parameters. ... M1 corresponds to a thermal time constant of 0.37 hours (22 minutes) for the rods. ...

... SiD workshop, Fermilab, April 9-11 2007 April 9, 2007 Nick Sinev, SiD design Workshop, Fermilab 1 Topics 1. ... What and how was simulated What and was One column clusters effects Accepted background density Hit reconstruction efficiency Hit efficiency How to improve efficiency Conclusions April 9, 2007 Nick Sinev, SiD design Workshop, Fermilab 2 What is this April 9, 2007 Nick Sinev, SiD design Workshop, Fermilab 3 Marty's idea Shift charge in neighboring columns in opposite directions. ...

... It was discovered that it would pass about 0.02 AU (about 3 million miles) from the Earth on 1998 August 11 --- close enough to be observed by the Arecibo Planetary Radar and (at much lower S/N) by the Goldstone Solar System Radar. ... Even at this distance, the Arecibo Planetary Radar can obtain images at up to 7 meter resolution. ... This delay-Doppler image of asteroid 1998 ML14 was taken on UTC 1998 August 15 12:45. ... A higher-resolution image taken on Aug 16. ... The Arecibo Observatory . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. August 24, 1999 . A Network of Microlensing Caustics . ... In microlensing , the gravity of stars near the line of sight can act to magnify the light of background objects such as distant stars , or quasars . ... When a background quasar moves across a microlensing caustic, it can appear dramatically brighter . ... About APOD > . ...