Search results: 17 posts match "Astronomy". Select title or scroll down to see posts.
 
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Meteor Shower.  13 August 2013.  11-16  Astronomy  D300  Juan de Fuca St 
Aug 13, 2013
  11-16, Juan de Fuca St, Astronomy, D300  
Moon.  12 August 2014.  70-300vr  Astronomy  Moon 
Aug 12, 2014
  Moon, Astronomy, 70-300vr  
Perseids Redux.  12 August 2015.  11-16  15/2.8  Astronomy 
Aug 12, 2015
  11-16, 15/2.8, Astronomy  
Experimentation.  16 August 2015.  11-16  Astronomy 
Aug 16, 2015
  11-16, Astronomy  
Blood moon.  28 September 2015.  70-300vr  Astronomy  Moon 
Sep 28, 2015
  Moon, Astronomy, 70-300vr  
Prepping for Perseids.  11 August 2016.  15/2.8  Astronomy 
Aug 11, 2016
  15/2.8, Astronomy  
A Trickle of Perseids.  13 August 2016.  15/2.8  Astronomy 
Aug 13, 2016
  15/2.8, Astronomy  
A mind-blowing trip.  16 September 2017.  Astronomy  Science 
Sep 16, 2017
  Science, Astronomy  
Moon.  1 February 2018.  70-300vr  Astronomy  Moon 
Feb 1, 2018
  Moon, Astronomy, 70-300vr  
A couple of Perseids.  9 August 2018.  Astronomy  Samyang 12 
Aug 9, 2018
  Astronomy, Samyang 12  
Milky Way.  13 August 2018.  15/2.8  Astronomy  Photography 
Aug 13, 2018
  Astronomy, Photography, 15/2.8  
Earthrise.  21 December 2018.  Astronomy 
Dec 21, 2018
  Astronomy  
Blood moon.  21 January 2019.  Astronomy  Moon 
Jan 21, 2019
  Astronomy, Moon  
Mars rover Opportunity completes mission.  14 February 2019.  Astronomy 
Feb 14, 2019
  Astronomy  
Moon walk anniversary.  20 July 2019.  Astronomy 
Jul 20, 2019
  Astronomy  
Comet Neowise.  18 July 2020.  Astronomy 
Jul 18, 2020
  Astronomy  
Comet Neowise.  19 July 2020.  Astronomy 
Jul 19, 2020
  Astronomy  
 
 
 
Meteor Shower
Tue 13 Aug 2013      11-16 - Astronomy  D300 - Juan de Fuca St
Meteor Shower
     Tue 13 Aug 2013      11-16 - Astronomy  D300 - Juan de Fuca St
 
 
 

To capture a shot of a meteor you need a cloudless, moonless sky, a tripod-mounted camera, a remote shutter release, an exposure long enough to see meteor trails but not so long as to capture star trails, and a glass or two of wine.

This photo was taken during the Perseid meteor shower, which is visible in North America from mid July to mid August. The view is looking south over the Juan de Fuca Strait to the town of Port Angeles, Washington, the bright light source in the distance. Shot with a Nikon D300, 11 mm focal length, f/2.8, 33 sec, and long-exposure noise reduction (LENR). LENR works by following each exposure with a second exposure of the same length but with shutter closed. The second exposure is then subtracted from the first to remove noise. This, of course, doubles the time to take the shot.

 
 
 
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Moon
Tue 12 Aug 2014      70-300vr - Astronomy  Moon
Moon
     Tue 12 Aug 2014      70-300vr - Astronomy  Moon
 
 
 

The weekend's clear night skies provided a good view of the moon. Watching the moon zoomed-in in live-view brings home the fact that it's a moving object, so a fast shutter helps. Both were taken on a tripod with a 70-300 vr, spot metering, and both, of course, were heavily cropped in post processing.

The half moon was shot at 220 mm, f/7.1, 1/320 sec; the full moon at 240 mm, f/7.1, and 1/1600 sec.

 
 
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Perseids Redux
Wed 12 Aug 2015      11-16 - 15/2.8 - Astronomy 
Perseids Redux
     Wed 12 Aug 2015      11-16 - 15/2.8 - Astronomy 
 
 
 

Meteor shots can be taken with a wide angle lens, a tripod, and a camera set on long exposure, typically 30 seconds or more. A lot of waiting in the dark of course but with some tunes and a glass of wine sitting out under the summer stars is not a bad way to spend some time.

I first tried this two years ago, also in August, during the Perseid shower. Lucky me, on my first night out I got a decent shot of a Perseid meteor. It's the second one below. I used bulb mode on the D300 and a timer on my android along with a wired remote to control the shutter.

So this morning, just after midnight, I spent about an hour taking sky shots to see if I can better the 2013 shot. I used the 15 mm fisheye to get more sky, a little higher ISO as I'm using a newer sensor, and a 30-sec exposure. Each 30-second exposure is followed by 30 seconds of noise reduction so each shot takes a minute, half of which time the shutter is closed and of course that's when I seemed to see the most meteors falling down though maybe I was imagining them. This morning I pulled the 53 shots into Lightroom, jacked up the lightness, and found two with meteors. Not very pretty meteors, though, with jagged trails. I guess I need to keep working on my recipe.

If tonight's clear I'm going to try again, but I'll use a non-fisheye wide angle, the same 11-16 as I used before. I don't like the curved horizon I'm getting from the 15. I'll also use the D800e's interval shooting function which I've been testing.

 
 
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Perseid meteor over Port Angeles ++      
 
 
Perseid meteor over Port Angeles ++      
 
 
Perseid meteor over Port Angeles ++      
 
 
Experimentation
Sun 16 Aug 2015      11-16 - Astronomy 
Experimentation
     Sun 16 Aug 2015      11-16 - Astronomy 
 
 
 

Sometimes I look at life as a series of experiments. Some experiments are solo (cooking, programming, running), some social (relationship, job, board membership), and they all generate data that I'll use in another experiment.

My current photography experiments are targeting a goal of creating a great shot of a falling meteor. While I'm not there yet I know what i want: many dots of starlight on a blacksky background, a foreground to give context, and all cut with a solid meteor streak. That's all. Well, that's a lot actually, as it depends not only on my skills but also on the weather and the moon light.

Experimentation so far has me using the 11-16 at 16, f/2.8, ISO 1250, and a target of the southern sky. The southern sky is a compromise: Port Angeles puts off a lot of light but any other direction is impeded by trees. I guess next time I'll have to forego the wine and take a drive to a nearby beach. I also wonder if i should boost the iso a bit. More experimentation.

Taking a series of long exposure shots is really tedious so I've found that if 30 seconds is long enough (more than 30 sec requires bulb mode) then Nikon's interval shooting function will take an evenings worth of shots for me, hands free. Interval shooting has three variables: interval length, shots per interval, and total number of intervals. So on the morning of the 14th I decided to take a series of 30-second shots from midnight till about 2 in the am ans so I set up the camera for one shot (aperture, iso, exposure) then set the interval function to take a shot every 65 seconds, with 1 shot per interval, and for a total of 120 intervals. I chose 65 sec intervals because the shutter is open for 30 then closed for 30 (long-exposure noise reduction), which totals 60 sec. I then added 5 sec as a cushion. Once set, all I had to do is press GO then head in for another glass of wine.

This was taken early on the morning of the 14th. I don't like the meteor streak as it's not solid but it sure was easy with the interval shooting function.

 
 
 
Perseid ++      
 
 
Perseid ++      
 
 
Perseid ++      
 
 
Blood moon
Mon 28 Sep 2015      70-300vr - Astronomy  Moon
Blood moon
     Mon 28 Sep 2015      70-300vr - Astronomy  Moon
 
 
 

Moon shots taken last night. The first is a cropped shot of the moon in the Earth's penumbra. The second shot is the un-cropped version of the first. The third shows the moon moving out of the penumbra.

 
 
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Blood moon cropped      
 
 
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Prepping for Perseids
Thu 11 Aug 2016      15/2.8 - Astronomy 
Prepping for Perseids
     Thu 11 Aug 2016      15/2.8 - Astronomy 
 
 
 

I spent two hours last night with the Nikon practicing for tonight's Perseid shower. Actually much of the time was spent on the couch, drinking wine, as the camera's interval timer does the grunt work. I didn't expect to catch much in the way of meteors, it was more about getting the exposure right and the interval timer working, so I was pleased to find two of sixty shots show what look like faint meteors. Study the upper left of the shot below and you'll see it, though maybe not on a phone.

Taking a photo of a meteor is different from your typical photo. A wide fast lens is good for this so I used both a 20/2.8 and a 15/2.8. I much prefer the fisheye but I know some people hate the distortion. The camera's settings were as follows:

  • Manual focus
  • Focus lens on infinity
  • 30 second shutter
  • ISO at 1250, maybe more
  • Matrix exposure
  • Long exposure noise reduction (LENR) set to ON (Shooting Menu)

Why these settings? Thirty seconds is long enough to get a nice streak but not so long as to get star trails. The matrix exposure setting is Nikon-speak for whatever is the camera's smartest exposure algorithms. ISO? Well, I'm still experimenting. It's 1250 here. And set LENR to ON so that the camera takes a second shot each time, for the same exposure length, but with the shutter closed. Then the camera subtracts the second from the first, thereby removing some noise. Note this more than doubles the time for a shot as the camera has to perform the calculations and write the image file or files to the card.

Next, place the camera on a tripod and position it to get a broad swath of night sky.

Finally, set up the camera to automatically take a series of photos. The interval timer needs to know how many photos to take and the time between each photo. For example, say you've an hour before you go to bed and so you want the camera to shoot for sixty minutes. A thirty second exposure takes the camera no less than sixty seconds (remember the LENR?) so we can take at most sixty shots per hour. A little less actually. I add a generous 15-second cushion between each shot making the interval 1 min 15 seconds for a 30-second exposure.

Now that we've the interval length and number of intervals go to the Nikon's interval timer. This is a powerful feature but it's a bit awkward to use. Here is the path I use through the timer's menus:

  • Shooting Menu
  • Interval timer shooting
  • Select Now then press right arrow
  • 00 Hr 01 min 15 sec (right arrow moves through)
  • 060 intervals x 1 shot per interval = 0060 shots
  • Select On and press the OK button

While the Nikon was busy I spent some time with the Fuji X-pro2, shooting the sky with the 16mm, and I found it has a similar interval timer, though it can only do one shot per interval.

I am listening to Trouble by Jose James.

 
 
 
Perseid meteor      
 
 
Perseid meteor      
 
 
Perseid meteor      
 
 
A Trickle of Perseids
Sat 13 Aug 2016      15/2.8 - Astronomy 
A Trickle of Perseids
     Sat 13 Aug 2016      15/2.8 - Astronomy 
 
 
 

A sky-full of shooting stars was what I hoped for but no, just the occasional singleton. A trickle. 48 out of 358 shots had something, which sounds good, but most were but a faint trace. Was I too early? Too late? Wrong ISO? Or was the shower masked by the lights of Port Angeles? Clearly, more experimentation is called for.

The second shot is darker because it was taken later the same evening and has a lower ISO.

I'm listening to the president's 2016 summer spotify playlist: day which triggers feelings of impending loss, the loss of a cool and scandal-free president.

 
 
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Perseids over Port Angeles      
 
 
Perseids over Port Angeles      
 
 
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Perseid over Port Angeles      
 
 
Perseid over Port Angeles      
 
 
Perseid over Port Angeles      
 
 
A mind-blowing trip
Sat 16 Sep 2017      Astronomy  Science
A mind-blowing trip
     Sat 16 Sep 2017      Astronomy  Science
 
 
 

A brilliant journey through space has come to an end. NASA's Cassini spacecraft spent the past twenty years successfully carrying out its mission to explore Saturn and its moons.

Cassini was launched in 1997 and it took seven years to reach Saturn. Along the way it flew by Venus, Earth, and Jupiter. Upon arrival Cassini took to orbiting Saturn where it sent back stunning photographs of the planet and its moons.

Sad to say, yesterday was Cassini's last day but what a trip it was, and what a testament to the skills of the scientists and engineers at NASA and elsewhere who participated in the endeavor. Whenever I feel despondent about mankind I'll remind myself of accomplishments such as this.

 
 
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Saturn's moon Titan      
 
Photo: NASA
Saturn and Earth      
 
 
Photo: NASA
Saturn and Earth      
 
 
Photo: NASA
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Cassini's journey      
 
 
Cassini's journey      
 
 
Cassini's journey      
 
 
Moon
Thu 1 Feb 2018      70-300vr - Astronomy  Moon
Moon
     Thu 1 Feb 2018      70-300vr - Astronomy  Moon
 
 
 

Here is a substitute for the recent blue moon which was not visible through the overcast and frequently-raining skies.

 
 
 
Moon      
 
 
Moon      
 
 
Moon      
 
 
A couple of Perseids
Thu 9 Aug 2018      Astronomy  Samyang 12
A couple of Perseids
     Thu 9 Aug 2018      Astronomy  Samyang 12
 
 
 
The southern sky at 10:41 pm      
 
 
The southern sky at 10:41 pm      
 
 
The southern sky at 10:41 pm      
 
 

My first sky shot with the 12mm on the Fuji. You can see a bit of Milky Way and a Perseid or two. I expect the Nikon with the 15mm will do better --- it's running as we speak, the intervalometer taking a 30" shot every minute or so --- but the Nikon shots will have to wait until morning since it can't zap images to the iPad like the Fuji.

 
 
 
Milky Way
Mon 13 Aug 2018      15/2.8 - Astronomy  Photography
Milky Way
     Mon 13 Aug 2018      15/2.8 - Astronomy  Photography
 
 
 

A slightly better shot of the Milky Way, helped by using a wider lens and higher ISO. Unfortunately, since taking this shot the skies over Vancouver Island have turned grey from smoke and haze.

 
 
 
Milky Way with roof and forest      
 
 
Milky Way with roof and forest      
 
 
Milky Way with roof and forest      
 
 
 
Photo: NASA
Earthrise, Apollo 8, 1968      
 
 
Photo: NASA
Earthrise, Apollo 8, 1968      
 
 
Photo: NASA
Earthrise, Apollo 8, 1968      
 
 
Earthrise
Fri 21 Dec 2018      Astronomy 
Earthrise
     Fri 21 Dec 2018      Astronomy 
 
 
 

A small planet, insignificant in size compared to the galaxy, but still our home and one perfectly suited for life, with water and air and soil and a sun nearby to give warmth. John Gardner in The Guardian

Apollo 8, piloted by Frank Borman, James Lovell, and William Anders, was launched fifty years ago today. The mission gave us a new view of planet Earth as well as our first view of the back side of the Moon.

 
 
 
 
The moon      
 
 
The moon      
 
 
The moon      
 
 
Blood moon
Mon 21 Jan 2019      Astronomy  Moon
Blood moon
     Mon 21 Jan 2019      Astronomy  Moon
 
 
 
The infamous blood moon taken with the Fuji. Looks pretty similar to the Nikon version.

 
 
 
Mars rover Opportunity completes mission
Thu 14 Feb 2019      Astronomy 
Mars rover Opportunity completes mission
     Thu 14 Feb 2019      Astronomy 
 
 
 

A regular day for NASA is a miracle for people like me. Someone on the internet

Something that makes me both happy and sad was Wednesday's NASA announcement that the Mars rover Opportunity spacecraft has ended its mission. Happy because it reminds me humans can do great things. Sad because, well, it's the end of life for the rover.

Opportunity landed on January 24, 2004, fifteen years ago. The rover was designed to last three months but remained working for 14 years. The rover has been quiet since a June dust storm. Opportunity's solar panels could not generate enough power to keep the spacecraft awake.

Opportunity provided an up-close view of Mars that scientists had never seen and it changed the model for planet exploration from studying a single spot to moving about the planet.

Opportunity's success came on the heels of a NASA mission that failed. A mathematical error due to inconsistent use of units, English and metric, caused the Mars Climate Orbiter to disintegrate. This is a story I often shared with my chemistry students as an example of the importance of tracking units.

What an amazing scientific and engineering achievement.

 
 
 
Photo: NASA
View from Mars Rover +      
 
 
Photo: NASA
View from Mars Rover +      
 
 
Photo: NASA
View from Mars Rover +      
 
 
Moon walk anniversary
Sat 20 Jul 2019      Astronomy 
Moon walk anniversary
     Sat 20 Jul 2019      Astronomy 
 
 
 

Holy cow! Man walked on the moon fifty years ago today. What a wondrous feat. Coincidentally I'm reading Scott Kelly's book Endurance about spending a year in the International Space Station. His is an interesting story: jet pilot, landing on aircraft carriers, flying in the space shuttle and Russian Soyuz, and then a year on the ISS. His description of being belted into the tiny craft that shoots them off the surface of the earth is enough to trigger in me a wave of claustrophobia. A fascinating story.

 
 
 
Moon      
 
 
Moon      
 
 
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Comet Neowise
Sat 18 Jul 2020      Astronomy 
Comet Neowise
     Sat 18 Jul 2020      Astronomy 
 
 
 
Comet over Otter Point      
 
 
Comet over Otter Point      
 
 
Comet over Otter Point      
 
 

This is comet Neowise, a phenomenon more visible to the camera than the eye. I'm happy I got it but I see hints of star trails so if tonight is clear I'll re-shoot at a shorter exposure. I see by my notes, which I failed to consult earlier, that the rule for avoiding star trails is shoot no longer than 600 sec mm / focal length (300 sec mm for APS-C). So I'd be better off at 6 sec, not the 15 used here. Last night I tested a range of shutter speeds (and ISOs) but 6 sec was lower than my lowest.

 
 
 
Comet Neowise
Sun 19 Jul 2020      Astronomy 
Comet Neowise
     Sun 19 Jul 2020      Astronomy 
 
 
 
The comet with a little context      
 
 
The comet with a little context      
 
 
The comet with a little context