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31209

ESA SSA-NEO Coordination Centre newsletter: July 2015

The ESA SSA-NEO Coordination Centre has released the July newsletter summarising the most relevant data and events on asteroids and comets approaching the
borgia_barbara
Jul 3
#31209
 
31208

Telescopes focus on Didymos - target of ESA's asteroid mission

The current orbital model for 65803 Didymos has two disjoint orbital poles, and there was hope that observations during this transit period would help
Marshall Eubanks
Jul 2
#31208
 
31207

NASA's New Horizons Spacecraft Stays the Course to Pluto

July 01, 2015 RELEASE 15-143 NASA's New Horizons Spacecraft Stays the Course to Pluto NASA's New Horizons spacecraft is getting a final "all clear" as it
Ron Baalke
Jul 1
#31207
 
31206

Comet Sinkholes Generates Jets (Rosetta)

http://www.esa.int/Our_Activities/Space_Science/Rosetta/Comet_sinkholes_generate_jets Comet Sinkholes Generates Jets Active pits on comet European Space Agency
Ron Baalke
Jul 1
#31206
 
31205

Increasingly active comet

Increasingly active comet http://www.esa.int/spaceinimages/Images/2015/06/Comet_activity_21_June patrick 718
Wiggins Patrick
Jul 1
#31205
 
31204

Helping Europe prepare for asteroid risk

Helping Europe prepare for asteroid risk http://www.esa.int/Our_Activities/Operations/Space_Situational_Awareness/Helping_Europe_prepare_for_asteroid_risk
Wiggins Patrick
Jul 1
#31204
 
31203

Helping Europe prepare for asteroid risk

Each year, astronomers worldwide discover over 1000 new asteroids or other space rocks that could strike our planet. And if one is spotted heading towards
borgia_barbara
Jul 1
#31203
 
31202

Re: Leap second handling (was Decimal day calculator?)

I checked what Bill suggests and indeed on Linux (Ubuntu 14.04) the change is instantaneous: 1435708799.956446 0.011438 1435708799.968032
Jure Skvarc
Jun 30
#31202
 
31201

Re: Leap second handling (was Decimal day calculator?)

... With some caveats. You are correct that this would have been a really good choice. The system clock would increase monotonically, and would be equal to
Bill Gray
Jun 28
#31201
 
31200

Re: Leap second handling (was Decimal day calculator?)

It makes no sense for computers based on UNIX to be making leap second corrections on the system clock, whether NTP based or not. UNIX system time is supposed
Scott Stuart
Jun 28
#31200
 
31199

Re: Leap second handling (was Decimal day calculator?)

On Sat, June 27, 2015 1:00 pm, 'Marshall Eubanks' ... A more technical look
Marshall Eubanks
Jun 27
#31199
 
31198

Re: Leap second handling (was Decimal day calculator?)

... The convention in VLBI is not to do scans over a leap second. ... Oh, that is a complicated question, as not all NTP servers are handled the same, nor are
Marshall Eubanks
Jun 27
#31198
 
31197

Re: Leap second handling (was Decimal day calculator?)

The question : If the observatory clock/computer is synched to online NTP time servers how long should we wait before safely assuming the clock has caught up
Dave Herald
Jun 27
#31197
 
31196

Re: Leap second handling (was Decimal day calculator?)

I can see that we need to be careful about making measurements based on exposures taken over the midnight - probably best not to do it. If the observatory
Tony Evans
Jun 27
#31196
 
31195

Re: Leap second handling (was Decimal day calculator?)

... That's because UT1 is determined after the fact by astronomers watching certain stars with transit circles. It's hard to predict irregularities in the
Dave Tholen
Jun 26
#31195
 
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