... I present results from several seasons of photometric observations of X--ray sources in the Orion OB1a and OB1b star formation regions. The initial goal was to measure the rotational periods of several dozen pre--main sequence (PMS) stars. ... Infrared and optical data confirm that 90% of the X--ray sources are PMS and about 10% of the PMS stars may have disks. ... I find rotation periods for five stars at confidence of greater than 99.9/ greater than 99/ at much lower confidence. ...

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• Optical Photometry
• Direct Monitoring of Rotational Modulation
• Period Determination

These notes summarize an informal HDF-S session at the Joint ESO/Australia workshop ``Looking Deep in the Southern Sky,'' which was held in Sydney, Australia, on 10-12 December 1997. Many groups who are planning or already executing HDF-S followup observations were present at this meeting and discussed their plans. ... AAT: 1 night imaging in broad and narrow (20 Angstrom) bands on HDF-S + environs using the Taurus tunable filter. Scheduled for May 1998. ... Scheduled for July 1998. ...

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• HDF-S Sydney Meeting Follow-up Notes
• December 2011
• Archive for December

... Observatory . Public . Science . ... Science Users Information > Science Publications > Archive of the ESO Enews > ESO-Enews #25: December 2012 . ... ALMA . ... Phase 1 Proposals . ... Data Handling and Products . ... Science Data Products Forum . ... It is ALMA policy to make all science data public after a proprietary period of (usually) one year. As the first ALMA Cycle 0 data were released to the PIs one year ago, they are now becoming public. ... FIRST ALMA EARLY SCIENCE DATA PUBLIC . ...

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• ESO - Newsletter December 2015
• ESO - Archive of the ESO Enews
• Help for Night Report / Progress Pages

... 27 May-1 June, 1993 (6 nights) Calar Alto, 1.23m. Calamai + Richichi . ... Log (OK) . 28 June-4 July, 1993 (7 nights) Calar Alto, 1.23m. Richichi + Stecklum . Photometry (OK) . ... 20-27 December, 1993 (8 nights) Calar Alto, 1.23m. Leinert + Richichi . ... 18-24 February, 1994 (7 nights) Calar Alto, 1.23m. Richichi + Stecklum . ... 16-21 July, 1994 (6 nights) Calar Alto, 2.2m. Calamai + Richichi + Stecklum . ... 12-16 January, 1995 (5 nights) Calar Alto, 1.23m. Richichi + Stecklum . ...

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• FIRPO Runs
• APOD: December 29, 1997 - The Milky Way in Infrared

... December 17, 1998 . The Night Shift . Credit: STS-88 Mission , NASA . ... Here, the eerie glow of work-lights illuminate Space Shuttle Endeavor astronaut Jerry Ross during a night on his second spacewalk as he continues the in orbit assembly of the ISS . Endeavor landed at Kennedy Space Center Tuesday night bringing an end to the successful ISS assembly mission and the final shuttle mission of 1998 . ... About APOD > . ... NASA Technical Rep.: ... A service of: LHEA at NASA / GSFC . ...

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• APOD: 2014 December 11 - Moondog Night
• APOD: 2012 December 25 - Yosemite Winter Night
• APOD: 2012 December 22 - Saturn at Night

. ATCA - Narrabri . HCO+ : 89.188 GHz BW = 32 MHz channels = 128 baseline CA03-04 . HCO+ absorption in the galaxy Centaurus A . ©ATCA . Cen A . Previous slide . Next slide . Back to first slide . View graphic version .

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• The Nature of the Optical Emission in Radio-selected AGN
• VLBI Observations
• VSOP Observing Schedule

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . Human Exploration . ... December . ... Posted on December 3, 2015 | No Comments WhatтАЩs that we hear? ... Continue Reading.. Posted on December 5, 2014 | 4 Comments The December skies mark my favourite time of the year for stargazing. ... Posted on December 6, 2013 | ... Posted on December 14, 2010 | ... Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration. ...

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• Astronotes | Armagh Planetarium's astronomy news from across the Universe -
• Orion | Astronotes
• December Night Sky Wonders | Astronotes

INTEGRAL observations of SS433 : new results Anatol Cherepashchuk Sternberg Astronomical Institute, Moscow University, Russia In collaboration with: Rashid Sunyaev ... Eleonora Antokhina, Nikolai Shakura, Darja Kosenko, Elena Seifina,Sergey Molkov (IKI) 1 Overview · Introduction · · · · Observations Analysis of hard X-ray spectra Analysis of hard X-ray eclipses Discussion and conclusions December 26, 2007 ...

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Follow-up observations with the University of Washington 0.76 m telescope at Manastash Ridge Observatory (MRO) of the Sloan Digital Sky Survey (SDSS) cataclysmic variable (CV) SDSS J170053+400358 are presented. ... They estimate that the dimming amounted to about 0.028 mag (using two comparison stars that were each about 4 mag fainter than HD 209458). only UW affiliated authors have been listed, student researchers are marked with an ``*'' . ... XTE J1859+226" UW affiliated authors: *Kevin Krisciunas. ...

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• ARCSAT Observers Nightlog Form

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Armagh Observatory reports that the morning of the winter solstice, 21st December 2010, was the fourth coldest December night at Armagh since observational records of daily temperature minima began in 1844. ... The previous lowest recorded December temperatures were more than 120 years ago, that is, -14.6 on 25th December 1878; -13.7 on 24th December 1878; and -12.2 on 20th December 1886. ...

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• Latest News
• The Best Sky View of the Year - this afternoon, Monday 1 December 2008 |
• Night sky view | International Year of Astronomy in Ireland | Astronomy 2009

Peremennye Zvezdy ( Variable Stars ) 28 , No. ... Received 15 November 2007; accepted 21 February 2008. ... Multi-night CCD observations of the previously unknown variable GSC 02805-00766 reveal its nature as a contact binary. We present its light elements and light curve. ... It was monitored by S. Kleidis in autumn/winter 2006 and autumn 2007 for fifteen nights. ... Fig. ... The phased light curves in both filters are given in Fig. 1 and Fig. 2, they are typical for W UMa systems. ...

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• Night Lightning on Jupiter
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NATIONAL ASTRONOMY AND IONOSPHERE CENTER . ... Visitor Center . ... Kick-Off Ceremony of the Arecibo Observatory 50th Anniversary . Observation Night . ... This activity was organized by the staff of the †Бngel Ramos Foundation Visitor Center with the collaboration of the Astronomy Society of Puerto Rico. ... The participants also had the chance to view the exhibits at the †Бngel Ramos Foundation Visitor Center as well as to view the new Arecibo Observatory movie at the AO Amphitheater. ...

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• Observation Night at the Arecibo Observatory National Astronomy and Ionosphere
• Arecibo Radar Imaging of Comet 8P/Tuttle
• FAST Project Visit National Astronomy and Ionosphere Center (Arecibo

Next: Data reduction Up: Spectral observations and data Previous: Observations with the KPNO . Follow-up spectroscopy with the CAHA 2.2m telescope was carried out during two runs (June and December, 1999, see Table 2 ), using the Calar Alto Faint Object Spectrograph (CAFOS) and Cassegrain focal reducer. During these runs a long slit of and a G-200 grism (187?mm -1 , first order) were used. ... FWHM) in the June run and due to CCD binning 20? FWHM) in the December run. ...

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• Observations and data reduction
• Observations
• Spectral observations and data reduction

... CI Cam is known to be a B[e] star and X-ray transient source. ... Figure 1. The light curve of CI Cam in residuals relative to the mean level of the slow variability (top) . The radial velocity curve of the HeII emission (middle) . ... The V light curve is shown in Figure 1 (top). ... Comparison of two CI Cam spectra in the region of HeII line. ... The radial velocity curve of HeII in CI Cam has a saw-tooth shape that may be an evidence of an elliptical orbit. ...

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• Vitaly Goranskij, SAI/Moscow Univ.
• On the problem of high spectral resolution observations of faint objects
• Radio sources identfification

NMW survey overview . Access image archive . ... The New Milky Way survey aims to detect bright (V<13.5) optical transients near the Galactic plane using an automated wide-field (8x6 deg.) system capable of surveying the whole Milky Way area visible from the observing site in one night. ... All images obtained during the transient search survey are available online (please use the image archive access form ). ... Images per field: . ... Images per night: . ... Milky Way imaging time: . ...

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NOVAC Newsletter - Reflections On 1982 . Articles | ... Richard Lawson . ... Attending this observation was Nils Thomas, John Huggins, Richard Lawson, Bob Koberg and his kids, David Edwards and Bryan Bloomer. ... Nils, John, Richard and A.J. Piccillo met for the July lunar eclipse. ... Twelve days later Nils, John, Richard, and Ian Babcock attended a scheduled NOVAC observation. ... Attending were Nils, John, A.J., Richard and Blaine Korcel. ... www.astronomy.net . About Astronomy Net | ...

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• Good Nights 10/16/03 To 10/20/03 - an Astronomy Net Observation_reports Forum
• Astronomy articles, forums, listings, and other resources about Astronomy.
• Great Night 10/24 - an Astronomy Net Observation_reports Forum Message

... Home Links International Sidewalk Astronomy Night . ... Saturday night, April 12, 2008, is the 2nd International Sidewalk Astronomy Night.€а We call on all amateur astronomers to take their telescopes and binoculars out for the public to enjoy the wonders of the night sky.€а A first-quarter Moon will be visible, as will the planets Saturn and Mars.€а More information can be found at http://www.sidewalkastronomynight.com /, where you can register so people will know where to find you. ...

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• Astronomy Nights at Intrepid Museum ? Amateur Astronomers Association of New
• Astro Imaging Workshop: Planetary Astro Imaging with a DSLR ? December 7, 2014
• Lecture Series 2015-2016 ? Amateur Astronomers Association of New York

... The highlight of the month is the total eclipse of the Moon during the night of December 20/21. ... Listed below are some of the key events, and the times they will occur, during December's total lunar eclipse. ... The eclipse is also visible in its entirety from Alaska (local time is UT тАУ 9 hours) and Hawaii (UT тАУ 10 hours), but be aware that most of the eclipse occurs on the 20th in these two regions. ... Penumbral Eclipse Begins . ... Partial Eclipse Begins . ... Total Eclipse Begins . ...

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• ASP: Star Science in the Autumn Sky
• ASP: Contents, November/December 2003
• ASP: Sharing the Night Sky with Your Students

... 1.7 GSC 084 Pulkovo Obs., 0.33 15 x 15' 1.0" 7 34 0.179 0.307 Normal Asgr. 3.0 UCAC 118 Slovakia, 0.57 14 x 10' 1.7" 3 12 0.090 0.145 Modra 3.3 USNO 127 Germany, 0.19 30 x 20' 2.4" 3 15 0.151 0.087 Bornheim 0.8 GSC 168 34 200 0.282 0.315 291 USA,Kitt Peak, 1.8 390 x 30' 1.0" 1 5 0.143 0.144 Spacewatch II 4.7 USNO 300 Japan, 0.5 78 x 78' 2.3" 7 36 0.420 0.447 Bisei Center 1.3 ACT 461 Hungary, JATE 0.60 28 x 19' 1.1" 6 22 0.124 0.153 Asteroid Surv. ... Polynesia 1.0 UCAC F85 Tiki Obs., ...

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• Accuracy of World positional CCD observations of the numbered minor planets

... In typical nightly use, the wide field and planetary telescope and cameras record images of favorably placed objects in the sky, including constellations, bright variable stars, nebulae through narrow-band filters, comets, the Moon, and planets. ... Shared Skies telescopes are available for use by students at the University of Louisville and the University of Southern Queensland, and by teachers and students in middle and high schools mentored by faculty at the universities. ...

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• Night Sky Images