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APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 4:06 am
by APOD Robot
Moon Meets Jupiter
Explanation: Skygazers around planet Earth enjoyed the close encounter of planets and Moon in July 15's
predawn skies. And while many saw bright Jupiter next to the slender, waning crescent, Europeans also had the
opportunity to watch the
ruling gas giant pass behind the lunar disk, occulted by the Moon as it slid through the night. Clouds threaten in this telescopic view from Montecassiano, Italy, but the frame still captures Jupiter after it emerged from the occultation along with all four of its large
Galilean moons. The sunlit crescent is overexposed with the Moon's night side faintly illuminated by
Earthshine. Lined up left to right beyond the dark lunar limb are Callisto, Ganymede, Jupiter, Io, and Europa.
In fact, Callisto, Ganymede, and Io are larger than Earth's Moon, while
Europa is only slightly smaller.
[/b]
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 11:50 am
by owlice
This is a stunning image. Wow!
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 12:17 pm
by orin stepanek
owlice wrote:This is a stunning image. Wow!
I'm in full agreement!
![Cool 8-)](./images/smilies/icon_cool.gif)
Jupiter and moons; Wow!
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 1:09 pm
by moonstruck
Double Wow! I thought at first it was an artist illustration, but Wow, Wow!
![:) :ssmile:](./images/smilies/smile.gif)
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 1:25 pm
by nstahl
Outstanding.
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 2:52 pm
by pmoss
Great image!
Thereis another object visisble above the Earth Moon, at almost 12:00. What is it?
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 3:17 pm
by Chris Peterson
pmoss wrote:There is another object visisble above the Earth Moon, at almost 12:00. What is it?
A star (mag 6.3). There's another star (mag 6.0) just to the left of the Moon, as well. These stars are more than a magnitude dimmer than Jupiter's moons, besides being attenuated by clouds (there is at least one other star close to the Moon that would be visible except for those clouds).
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 3:39 pm
by FloridaMike
orin stepanek wrote:owlice wrote:This is a stunning image. Wow!
I'm in full agreement!
![Cool 8-)](./images/smilies/icon_cool.gif)
Jupiter and moons; Wow!
...and clouds! I know clouds are the bane of the Astro-photographer. However, they sure added a dramatic element to this photo.
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 3:42 pm
by Guest_m
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 3:49 pm
by Guest
The Facebook thumbnail is wrong.
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 7:31 pm
by Ann
Chris Peterson wrote:pmoss wrote:There is another object visisble above the Earth Moon, at almost 12:00. What is it?
A star (mag 6.3). There's another star (mag 6.0) just to the left of the Moon, as well. These stars are more than a magnitude dimmer than Jupiter's moons, besides being attenuated by clouds (there is at least one other star close to the Moon that would be visible except for those clouds).
Do you know the HD numbers of those stars, Chris? (Or maybe their SAO numbers?)
I think that HD 27742 (a B8 star) and HD 27639 (an M0 star) are both near magnitude 6.0, and they are both close to Jupiter. But I can't find one close to Jupiter whose magnitude would be near 6.3.
Ann
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 8:30 pm
by Murrkon5
I'm a little gobsmacked. Sure, today's spectacular image features the Moon, but no mention anywhere of "Space Era"?? 43 years ago? Anyone? Anyone?
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 8:54 pm
by Chris Peterson
Ann wrote:Do you know the HD numbers of those stars, Chris? (Or maybe their SAO numbers?)
I think that HD 27742 (a B8 star) and HD 27639 (an M0 star) are both near magnitude 6.0, and they are both close to Jupiter. But I can't find one close to Jupiter whose magnitude would be near 6.3.
I think the star on the left is HD 27742 (v=6.0) and above is HD 27524 (v=6.8). The one I originally thought was on top is in my catalog as GSC 1276-1033 (mag 6.3), however, a SIMBAD search suggests that this is a bad entry in the catalog and doesn't correspond to an actual star (a common problem with the GSC catalog).
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 9:10 pm
by sage
That's Fantastic, Cristian!
![clapping :clap:](./images/smilies/asterisk_clap.gif)
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 11:17 pm
by maxxx111
I believe I'm seeing it!
Yes, yes!
Take a slightly averted look at Jupiter and you will just pick up the dark band !
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 11:51 pm
by Chris Peterson
maxxx111 wrote:Take a slightly averted look at Jupiter and you will just pick up the dark band !
Averted imagination, you mean. There's no structure present in this image of Jupiter.
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Fri Jul 20, 2012 11:58 pm
by Anthony Barreiro
Murrkon5 wrote:I'm a little gobsmacked. Sure, today's spectacular image features the Moon, but no mention anywhere of "Space Era"?? 43 years ago? Anyone? Anyone?
It was one small step for [a] man, one giant leap for [hu]mankind.
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Sat Jul 21, 2012 4:56 am
by chanio
Hi!
Sorry for my ignorance, but isn't it the Moon's shadow over Jupiter what we are seeing?
If it were the moon's body, the proportions wouldn't seem to match.
And the Moon´s rounded body would cover the satelites view...
Re: APOD: Moon Meets Jupiter (2012 Jul 20)
Posted: Sat Jul 21, 2012 10:56 am
by Ann
chanio wrote:
Hi!
Sorry for my ignorance, but isn't it the Moon's shadow over Jupiter what we are seeing?
If it were the moon's body, the proportions wouldn't seem to match.
And the Moon´s rounded body would cover the satelites view...
![Image](http://www.abmedia.com/astro/planets/earthshine.jpg)
A crescent Moon with its night side illuminated by earthshine.
Photo: Chris Cook.
I'm not absolutely sure I understand your question, but what we are seeing is the Moon in its crescent phase with the night side of the Moon illuminated by earthshine.
In the same way as we see the Moon shine in the night because it is illuminated by sunlight, the Earth also seems to shine in space because it is illuminated by sunlight. But the Earth "shines" much more brightly than the Moon. For one thing, the Earth is larger, and for another, it is considerably more reflective.
The Earth shines brightly over the Moon, and light from the Earth illuminates the night side of the Moon. This light from the Earth on the night side of the Moon is called earthshine.
In the APOD being discussed here, we see Jupiter and its Galilean moons over the earthshine-illuminated night side of the Moon.
Ann