Showing posts with label Space. Show all posts
Showing posts with label Space. Show all posts

Wednesday, May 26, 2010

观星

5月16日傍晚,我们奔赴 Hillsborough, NH 去看星星。时间有一点赶,V 担心我们会错过了 Atlantis-ISS。我们在可视时间3分钟前到达。我于是手忙脚乱地支起三脚架,还没来得及把相机放好,V 就在南方天空发现了一个耀眼的飞行器,现场的三位准天文学家一致认为这就是Atlantis-ISS了。在傍晚的天空,它是那样闪亮,像挂在西天的金星一样。我的相机的自动聚焦系统对这样几乎空无一物的背景毫无办法,我得手动聚焦,太困难了,广角吧很难看见目标,长焦吧,曝光时间又太长容易抖。天文摄影挺困难的。这是我这晚的心得。

 IMG_3736_2 IMG_3740_2

Atlantis-ISS 就是上面图片里的小亮点。从发现到消失在东偏东南方向可能只有两分钟的时间。我能抓到这几张就不错了。航天飞机除了这次任务,就只有两次任务就要全部停飞了,让人倍觉珍惜这难得的一见。这三百多公里之上是我们人类在飞行。我想想都着迷。

回头看看西边的天空,一弯新月和金星在树梢。黑暗的近景里是我们今晚的两个 bonus 望远镜,除了 A 的15英寸望远镜之外。

IMG_3744_1_1IMG_3763_2

月朗星稀。月亮未落的时候我们就看月亮。环形山看得真清晰,我好激动。想用我的相机拍,无奈我的长焦非但不够长,而且还太软,根本照不出任何细节。

我们还看见了很多流星。它们划过夜空的时间太短,我都来不及许愿,就更别提给它们留影了。倒是看到了更多的人造飞行器,比如下面的卫星,在高空还能被阳光照耀,所以可以反射到地面:

IMG_3789_1  IMG_3849_1

至于另一种人造飞行器,飞机,就更加特别了,因为它们总是一闪一闪,像这样:

IMG_3850_1

我们又看了火星,土星及其卫星,很多星团(原来有开放和闭合的区别),双星,星云,星系。我非常震撼。午夜时分,在星光下,我能看见V的白色帽子。真的只是星光,我意识到,这是百年前,千年前,万年前发出的星光,人类文明前发出的星光,于是就明白了,我们只是自然历史里多么小的一朵浪花,看似微不足道,我们却已经发展到如今的这样的高科技。我们的明天又会怎么样。让我无限的期待。

红光真的是保护夜视能力的。当我从开着红灯的小屋暖和过来,一出门,就发现银河似乎更加耀眼了。

又尝试了星轨。大家看看有没有进步。

 StarTrail1_1 StarTrail2_1

Wednesday, April 14, 2010

My First Star Trails

Apr. 10, 2010, 9:50pm, total of ~36 min exposure, Av 6.3, ISO 800, 18 mm.

Did I catch a meteor in this one? (detail of above image)


The Big Dipper: 10:37pm, ~7 min exposure.

Thanks to D for telling me how to merge multiple images :)

Sunday, September 20, 2009

Stargazing

Away from city light pollution, in Hillsboro, NH, the sky is really dark. Here you can see the Milky Way with naked eyes.

The Milky Way, looking south. Half of Sagittarius (the Teapot, center of our galaxy) was already beneath the horizon.
The Milky Way, zenith. Summer triangle: Deneb (top), Altair (left), and Vega (right, toward center)

Milky Way and Cygnus, Lyra, and Aquila (basically the same constellations as above, but with a shorter exposure).

Andromeda Galaxy, our nearest neighbor: the fuzzy yellow smear near the center
Andromeda Galaxy: yellow fuzzy streak just above center (why do the other stars look different?)

Beautiful Pleiades

It was getting really cold (38F. NE September!). My camera frosted. Jupiter looks like a shining star with spikes!

After I warmed up my camera with my body temperature, I was able to get this picture of Jupiter and its four moons: Europa, Callisto, Io, and Ganymede (top left to lower right). Please excuse my inability to focus!
Here is something I just learned about the four largest moons: the orbits of Io, Europa, and Ganymede, form a pattern known as a Laplace resonance; for every four orbits that Io makes around Jupiter, Europa makes exactly two orbits and Ganymede makes exactly one. How cool is that!

We also observed many nebulae (Ring, Veil, and Dumbbell), star clusters (M13, M11, and M15), double star Albireo (cool colors), double-double star epsilon-epsilon Lyrae (except we weren't able to resolve the double-double), galaxies M81, M82, and maybe others. It is really nice to see all these with my own eyes, albeit professional photographs look undoubtably better, I feel like walking the path of pioneer astronomers. Imagine Galileo Galilei discovering the four largest Jupiter moons in 1610. I see the strips on Jupiter with the help of the telescope. Truly amazing.

All through the night (cold it may be), meteors kept falling (might be from Piscis Australis), and then around 12:56am, while I was reviewing my picture of the Pleiades, I saw a bright light through the corner of my eye. There was it, the brightest, biggest meteor I have ever seen in my whole life, falling ever so slowly in the moonless night sky, with a green flare trailing, in the direction of east-southeast. It was dream-like, so silently, yet felt so close because it was so bright, that I was thinking, "oh no! We are gonna get hit!" I wasn't sure whether I should take cover, though there was nothing to cover me, or to take a photo -- my camera was pointing east-northeast. Before I was able to make the necessary turn, the meteor disappeared. We were absolutely stunned, by our good fortune for seeing such an unusual event. Later in the day there was some confusion as whether we saw the NASA weather rocket launched earlier Saturday night, but I believe we saw a meteor, one to remember.

Monday, August 13, 2007

Stargazing Last Week

It was confirmed today that the shining, fast-moving celestial object I saw last Wednesday or Thursday night was a Perseid meteor. The criteria:

1) It was heading south from north by north-east.
2) It was too fast to be an airplane.
3) It was too bright to be International Space Station (I don't even know where its orbit is).

So even though I was too tired to gaze last night (its peak time), I still saw the meteor shower, just in that 30 seconds I happened to be looking :) With this luck, I should go and buy lottery.

Last Saturday, I also saw the Milky Way with naked eyes, and many many more stars than any star chart could show. I remember that I was more than once told the story of Vega (织女) and Altair (牛郎), and Deneb (鹊桥). The thing was, I never really learned those stars until recently. But they are really prominent in the sky. They make a great Summer Triangle.

Tuesday, July 31, 2007

J. K. Rowling

Must be a stargazer.

Evidence:

Sirius (the dog star. the brightest star in the night sky)
Regulus ("prince" or "little King". Brightest star in Leo, the Lion. It is very close to the ecliptic plane.)
Arcturus (brightest star in Boötes, the Herdsman. Arc to Arcturus, speed to Spica.)
Andromeda (our closest neighbor galaxy M31 lies in this constellation.)
Draco ("dragon". the large constellation that wraps around Ursa Minor, the Little Dipper.)

etc.

Tuesday, May 01, 2007

Once in a Blue Moon

Yes, stargazing is still my obsession.

How rare is a full blue moon? (From Earth & Sky)

Tonight's Sky for Tuesday, May 01 2007

The moon will look full tonight, lighting the night from dusk till dawn. In the Americas, though, the moon won’t be truly full till tomorrow morning, at 5:09 a.m. Central Daylight Time. For the Americas, tomorrow’s full moon will be the first of two full moons in May. The second full moon to occur in a single calendar month is popularly known as a blue moon. We elaborate on today’s radio show.

Every 19 years, the phases of the moon recur on (or near) the same calendar dates. So in 2026, there will be two May full moons. Once again, the second full moon will be dubbed a blue moon.

This famous 19-year cycle reveals how often blue moons occur. Every 19 years, there are 235 full moons – yet only 228 calendar months. Therefore, the 7 leftover full moons (235-228=7) have to share the same calendar month with another full moon. That gives 7 blue moons in 19 years.

Yet, there’s one big hitch! February of 2018 has no full moon whatsoever. That’s another displaced full moon that falls right into the lap of March. So that’s a total of 8 blue moons for the next 19 years.

Written by Bruce McClure, 1 May 07

Friday, April 06, 2007

Saturn




My new obsession.

Details and credits are here.

Tuesday, February 06, 2007

Johnson Space Center

Oh my, don't we all like to gossip! I guess the astronaut love triangle / attempted murder is hot news today. Apparently love drives one crazy, even astronauts can't be spared.

I visited the Johnson Space Center (JSC) on the last day of 2006. I am posting some pictures in case you haven't been there yourself. As you might know, JSC serves as the mission control center for all the space shuttle flights and much more. Remember the famous "Houston, we've got a problem"?


No shuttle was in space that day, plus it was a Sunday, so the control room was empty. But you still can see on the screens where the International Space Station (ISS) was currently orbiting the earth, and live video feeds from the ISS.

Training facility

Rockets

Why did I become suspicious about the Moon project after I saw the exhibition?
Maybe I should spend more time reading about it.



Bonus pics:
Houston

At sunset
The last ray of 2006

Friday, January 12, 2007

Comet McNaught


I've seen it with my own eyes! Now I really believe that it is there. I have been stargazing this comet for the past three days and finally today we have no clouds to obstruct our view. It is a really bright comet, given that this picture was taken 30 minutes after sunset. Today it moves closest to the Sun, and then it will fly away, and never come back again.

ps, a pair of 10X binocular is so much more powerful than my 300mm telephoto lens :(.

Friday, September 15, 2006

Analemma

Analemma of the Moon
Credit & Copyright: Rich Richins


I love astronomy!

I came across this photo today, and I learned what an analemma is! For an explanation, click here and follow the links within.


Added Sept. 16, 2006: This person is amazing! Check out his photos of analemma at different hours of the day, taken as a multi-exposure on a single piece of film. I especially like this vertical one:

Jan 12, 2002 - Dec 21, 2002
12:28:16 UT+2
Athens, Greece (38.2997° N, 23.7430° E)
Copyright © 2001-2005, Anthony Ayiomamitis.