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APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 4:05 am
by APOD Robot
Moon Occults Venus
Explanation: It may look like
Earthrise, but it's actually Venus-set. Just after sunrise two days ago, both the Moon and Venus also
rose. But then the Moon overtook
Venus. In the
featured image sequence centered on the Moon, Venus is shown increasingly angularly
close to the Moon. In the
famous Earthrise image taken just over 50 years ago, the Earth was captured rising over the edge of the Moon, as seen from the
Apollo 8 crew orbiting the Moon. This similar Venus-set image was taken from Earth, of course, specifically
Estonia. Venus shows only a thin crescent because last week it passed
nearly in front of the Sun, as seen from Earth. The
Moon shows only a
thin crescent because it will soon be passing directly in front of the
Sun, as seen from Earth. Today, in fact, two days after this image was taken, the Moon
will create a solar eclipse, with a thin swath across the Earth treated to an
annular solar eclipse.
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 4:19 am
by A vent
Reminds me to narfel the Garthog. Coneheads, a great part of our culture and heritage.
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 5:28 am
by scr33d
A refreshingly stark image that clearly contrasts the albedo of Venus (0.75) vs the moon (0.12).
(APOD is suffused with so many photoshopped, cut-and-paste, "enhanced", and physically impossible images that belong on facebook, not on an astronomy site.)
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 6:26 am
by Costello
Wait a minute : if the Moon rised after the Sun, it means it has already passed the Sun-Earth line... how could it éclipse the Sun two days later?
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 6:40 am
by Thierry Legault
very nice picture!
I have a question about image submission: in today's page I see a link to FB and the "Notable images of the Venus - Mooon conjunction of 2020 June submitted to APOD"
https://www.facebook.com/pg/APOD.Sky/ph ... 3196624549
Are they automatically selected from this forum or is there something to do to submit them also to the FB page?
Thanks
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 11:15 am
by orin stepanek
Venus shows a lot of clarity in this photo!
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 12:00 pm
by neufer
Costello wrote: ↑Sun Jun 21, 2020 6:26 am
Wait a minute : if the Moon [rose]
after the Sun, it means it has already passed the Sun-Earth line...
how could it éclipse the Sun two days later?
The picture is upside down.
The Moon rose slowly... then Venus rose and appeared to overtake & pass behind the Moon.
Technically: the Moon occults Venus.
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 1:23 pm
by Chris Peterson
scr33d wrote: ↑Sun Jun 21, 2020 5:28 am
A refreshingly stark image that clearly contrasts the albedo of Venus (0.75) vs the moon (0.12).
It is only because they are so very close in intensity- extremely rare in astronomical images- that a linear image like this is possible.
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 2:20 pm
by neufer
scr33d wrote: ↑Sun Jun 21, 2020 5:28 am
A refreshingly stark image that clearly contrasts the albedo of Venus (0.75) vs the moon (0.12).
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 2:49 pm
by Chris Peterson
neufer wrote: ↑Sun Jun 21, 2020 2:20 pm
scr33d wrote: ↑Sun Jun 21, 2020 5:28 am
A refreshingly stark image that clearly contrasts the albedo of Venus (0.75) vs the moon (0.12).
Does that matter for this image?
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 4:01 pm
by johnnydeep
Thierry Legault wrote: ↑Sun Jun 21, 2020 6:40 am
very nice picture!
I have a question about image submission: in today's page I see a link to FB and the "Notable images of the Venus - Mooon conjunction of 2020 June submitted to APOD"
https://www.facebook.com/pg/APOD.Sky/ph ... 3196624549
Are they automatically selected from this forum or is there something to do to submit them also to the FB page?
Thanks
I can't answer your question, but thanks for making me click through to that site! Some amazingly beautiful images there, like for example, this 8.5 hour exposure of The lagoon Nebula (M8):
https://www.facebook.com/APOD.Sky/photo ... 2833653258. But then, using the left and right scroll buttons you soon find that each image is more amazing than the last! And I actually find this easier to browse through - though less educational - than the APOD site.
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 6:39 pm
by bystander
Thierry Legault wrote: ↑Sun Jun 21, 2020 6:40 am
very nice picture!
I have a question about image submission: in today's page I see a link to FB and the "Notable images of the Venus - Mooon conjunction of 2020 June submitted to APOD"
https://www.facebook.com/pg/APOD.Sky/ph ... 3196624549
Are they automatically selected from this forum or is there something to do to submit them also to the FB page?
Thanks
As far as I know, the images on
APOD Sky on FB come from submissions to Robert and/or Jerry, or those posted to the
Submissions page here. I think Robert is the admin there (or perhaps one of his graduate assistants).
Re: APOD: Moon Occults Venus (2020 Jun 21)
Posted: Sun Jun 21, 2020 8:01 pm
by Joe Stieber
neufer wrote: ↑Sun Jun 21, 2020 12:00 pm
Costello wrote: ↑Sun Jun 21, 2020 6:26 am
Wait a minute : if the Moon [rose]
after the Sun, it means it has already passed the Sun-Earth line...
how could it éclipse the Sun two days later?
The picture is upside down.
The Moon rose slowly... then Venus rose and appeared to overtake & pass behind the Moon.
Technically: the Moon occults Venus.
Actually,
the picture is rotated about 90° clockwise from a direct view (e.g., as seen with binoculars or unaided eyes) at the photographer's location in Estonia when the occultation started around 12:15 pm local summer time (08:18 is stated on his Astrobin page, which must be UT), about 8 hours after the moon, and then Venus, rose a little before 4:30 am local time (they were about 4° apart when rising). The occultation began about 8 hr later, so 4°divided by 8 hr = 0.5°/hr, the well-known nominal rate of the moon's eastward motion against the background sky, which is also about one moon diameter per hour. Since it was close to noon and the objects in question would be near the meridian, the movement of the apparent sky in that area would be essentially horizontal, left-to-right (east-to-west), with the moon moving a bit slower in its inexorable march eastward.
The APOD text is poorly worded, suggesting the moon and Venus rose just after sunrise and "Venus is shown increasingly angularly" close to the moon (whatever that means). Indeed, as Costello indicated, there's a definite inconsistency with the stated rising shortly
after the sun in view of the impending solar eclipse (new moon). I think there was too much of an effort to make today's APOD imitate the "Earthrise" image. This is a fine image in its own right (and would be even better if shown in a correct orientation). Finally, there's no rising or setting of Venus with respect to the moon from our earthly viewpoint as Neufer noted.