Starship Asterisk*

Milky Way Panorama from Mauna Kea

Explanation: Aloha and welcome to a breathtaking skyscape. The dreamlike panoramic view looks out from the 4,200 meter volcanic summit of Mauna Kea, Hawai'i, across a layer of clouds toward a starry night sky and the rising Milky Way. Anchoring the scene on the far left is the dome of the Canada-France-Hawaii Telescope (CFHT), with north star Polaris shining beyond the dome to the right. Farther right, headed by bright star Deneb, the Northern Cross asterism is embedded along the plane of the Milky Way as it peeks above the horizon. Both Northern Cross and brilliant white Vega hang over a foreground grouping of cinder cones. Near the center are the reddish nebulae, stars and dust clouds of the central Milky Way. Below, illumination from the city lights of Hilo creates an eerie, greenish glow in the clouds. Red supergiant star Antares shines above the Milky Way's central bulge while bright Alpha Centauri lies still farther right, along the dusty galactic plane. Finally, at the far right is the large Gemini North Observatory. The compact group of stars known as the Southern Cross is just left of the telescope dome. Need some help identifying the stars? Just slide your cursor over the picture, or download this smaller, labeled panorama.

<< Previous APOD

This Day in APOD

Next APOD >>

[/b]

So...this is the exact same photo from February 19, 2009. Nice try at originality

Q4: Have some APOD pictures been run more than once?
A4: Yes. Many of our readers have been with us less than a year and are unaware of some really spectacular or important astronomy pictures. New information about old pictures is becoming available over the WWW. The text and links for rerun pictures will make use of this newly available information. So although the picture might be old, some of the text and links of each APOD will be new. Also, more web surfers have larger bandwidth connections, which allows us to post higher-resolution image files that can be transferred conveniently. Software to handle more sophisticated image file formats has also become more common, so the picture's size and/or format might be new. Lastly, rerunning APODs saves us time and helps us update our archive. In general, our rerun policy currently is to only rerun APODs more than one year old to keep the pictures relatively "new" to new APOD viewers. We will almost never rerun more than two pictures in any given week. So when you load the current APOD,it is still, most probably, a new picture.

http://apod.nasa.gov/apod/ap_faq.html

It would be unkind, I suppose, to point out that the complaint about a repeated APOD has been seen before (many times), so I won't...

I like the picture! Lots of stars, constellations and nebulae show up really well. It's nice that the picture is annotated. For myself, I love the blue brilliance of Vega. When I used to belong to an astronomy club and we showed stars to visitors, I always asked them to look at Vega and say what color it seemed to be. Everyone said it looked bluish!

As for the fact that this is a repeat picture, well, Sundays are the repeat days at APOD. Those who choose the pictures to be published, write the captions and provide numerous links to go with the pictures need a day off, too!

Ann

Ah, the Milky Way. The Pipe Nebula, the Dragon Fly just above the Pipe, maybe carrying it, The guy doing PUSH UPS to the right of that, and in the far left, the Head of the Dragon heading down into the clouds, with Deneb and the Northern Cross. Always a pleasure!!!!

:---[===] *

Still too cold here to get out and do anything, but I am going to try earlier in the evening.

This is an absolutely stunning image! To be able to see Polaris and the Southern Cross in the same photograph
I've only been visiting this site for about two months and, although I DO browse through the Apod archives, I am always very glad when some are brought to my attention. As in today's image.

Margarita

To tell the truth, APOD has never been failed to shock me. The panorama today, regardless of my disability to connect the "Northern Cross" to "Cygnus", is spectacular too. Hope I can go to some places like Hawaii to see the scene someday.

1st of all - Wow.
2ndly - They get snow in Hawaii?

owlice wrote:

Q4: Have some APOD pictures been run more than once?
A4: Yes. Many of our readers have been with us less than a year and are unaware of some really spectacular or important astronomy pictures. New information about old pictures is becoming available over the WWW. The text and links for rerun pictures will make use of this newly available information. So although the picture might be old, some of the text and links of each APOD will be new. Also, more web surfers have larger bandwidth connections, which allows us to post higher-resolution image files that can be transferred conveniently. Software to handle more sophisticated image file formats has also become more common, so the picture's size and/or format might be new. Lastly, rerunning APODs saves us time and helps us update our archive. In general, our rerun policy currently is to only rerun APODs more than one year old to keep the pictures relatively "new" to new APOD viewers. We will almost never rerun more than two pictures in any given week. So when you load the current APOD,it is still, most probably, a new picture.

http://apod.nasa.gov/apod/ap_faq.html

It would be unkind, I suppose, to point out that the complaint about a repeated APOD has been seen before (many times), so I won't...

This answer fits me rather well. Thanks for the rerun, and it's so stunning I won't mind seeing it again in years to come. (Err, unless the world happens to end first. See Moonlady's comment two posts down.)

greatguyinsf wrote:1st of all - Wow.
2ndly - They get snow in Hawaii?

Up on 4200 meter Mauna Kea, sure. Measured from it's base where it rises from the sea-floor it's the world's tallest mountain.

Dear amazing APOD team,

I am concerned about tomorrow!!!

How does you incredible team informed us average people only one day before the EARTH EXPLODES!!!


I already sold my 2012 Dec World End protection utensils like my tinfoil hat!

Now I have to go to the grocery to buy aluminium foil, but what?! It's sunday and I can't!!!

I even dont have and to go with it, at home to sit back and enjoy the show!!!

Have mercy next time please when the world ends.

sincerely

PS: I assume it's gonna be Etna?

Earth explodes, eh?
And here I thought the people at DC Comics exaggerated when they insisted that Superman's home planet Krypton had exploded....

So what Earth baby will be the lucky survivor, being shuttled away from the Earth in a, well, space shuttle, on his way to Supermanhood on another planet?

Ann

BDanielMayfield wrote:

greatguyinsf wrote:1st of all - Wow.
2ndly - They get snow in Hawaii?

Up on 4200 meter Mauna Kea, sure. Measured from it's base where it rises from the sea-floor it's the world's tallest mountain.

Ah! I may dare piggy-back a compound question here, which coïncidentally I was wondering about just this morning. Not an astronomical question to be sure, rather one of geography.

- what is the /average/ height of emerged land (above sea level) ?
- what is the /average/ depth of ocean floor (below sea level, duh) ?
- what is the average level of (both emerged and drowned) the Earth surface, relative to average sea level ?

Hope I'll be pardonned the off-topic...

--
Czerno

Czerno -1 wrote: - what is the /average/ height of emerged land (above sea level) ?
- what is the /average/ depth of ocean floor (below sea level, duh) ?
- what is the average level of (both emerged and drowned) the Earth surface, relative to average sea level ?

Google is your friend.

Mean height of land area: 840 m
Mean depth of ocean area: 3682 m
Average ocean depth if the surface were spherical: 2800 m

Suggestion: go to the Institute for Astronomy, Univ. of Hawaii webpage and download the pdf map of the summit of Mauna Kea. Note the direction of north (the arrow at bottom center in the pdf). Note also the positions of the CFHT and Gemini North domes at the right part of the map. Look at the panorama, and realize that from the position of the camera (which is aimed roughly southeast), only part of the CFHT dome is visible. Then ask yourself, how could the background possibly include Polaris, which is within one degree of true north? From the position of the camera, Polaris is either behind the CFHT dome or would appear to the left of the dome. This is a nice photomontage, made up of two separate images and combined. It is not real. Many if not all of Pacholka's images are similar photomontages. They're well done, pretty, and interesting, and if he was up front that they are constructions, that would be fine. But he claims they are real, single exposures. If you look at the geometry of the summit, the domes, and the sky, it is physically impossible for this to be one exposure. Yet people continue to be taken in. People who should know better.

Bob wrote:Suggestion: go to the Institute for Astronomy, Univ. of Hawaii webpage and download the pdf map of the summit of Mauna Kea. Note the direction of north (the arrow at bottom center in the pdf). Note also the positions of the CFHT and Gemini North domes at the right part of the map. Look at the panorama, and realize that from the position of the camera (which is aimed roughly southeast), only part of the CFHT dome is visible. Then ask yourself, how could the background possibly include Polaris, which is within one degree of true north? From the position of the camera, Polaris is either behind the CFHT dome or would appear to the left of the dome. This is a nice photomontage, made up of two separate images and combined. It is not real. Many if not all of Pacholka's images are similar photomontages. They're well done, pretty, and interesting, and if he was up front that they are constructions, that would be fine. But he claims they are real, single exposures. If you look at the geometry of the summit, the domes, and the sky, it is physically impossible for this to be one exposure. Yet people continue to be taken in. People who should know better.

There's nothing impossible about it at all. You stand a bit southeast of the CFHT dome and start your exposure north, sweeping the panorama clockwise to the east (over Hilo) and ending up pointing a little west of south, just past the Gemini dome. There may or may not be images combined here to create a mosaic, or to manage different light levels, but there's certainly nothing physically out of place with this panorama. The sky background is completely consistent with the dome positions.

Chris - You're right. I had looked at several of Pacholka's images on his website in the past, and the claim he made for those images was that they were single, unedited exposures. In this case, I assumed, and did not check, that he made the same statement, but in fact he did not. I just had a look at his website and in this case he was clear this was stitched from several photos. I owe him an apology in this case; the geometry is possible (I also looked at the summit in Google Earth, and given it's a stitched panorama I came to the same conclusion you did). It doesn't change my opinion of a lot of his other stuff, but I retract the statement that you responded to. Thanks for forcing me to take a closer look .

Breathtaking, literally and metaphorically. 4200 meters elevation! It's even higher if you measure in feet!

At 20 degrees north latitude, Hawaii is an interesting place for skywatching. You see all the northern constellations, but the area of circumpolar stars is much smaller than at midnorthern latitudes. You can really see why Polynesians call the constellation of Scorpio Maui's fishhook, the one he used to pull the Hawaiian islands out of the sea. And you can see a lot of the southern constellations. I've only been to Hawaii once, but I want to go back!

In the description of the photo in Wally Pacholka's website it was very interesting to read that the yellow glow (on my monitor, but said to be a red glow in the description) through the clouds to the right "is lava exploding into the ocean". Wow!

PS. In the APOD explanation it states "illumination from the city lights of Hilo creates an eerie, greenish glow in the clouds" but it is reddish, not greenish, on my monitor so I wonder if that is incorrectly set or does it not appear greenish to others?

DavidLeodis wrote:In the description of the photo in Wally Pacholka's website it was very interesting to read that the yellow glow (on my monitor, but said to be a red glow in the description) through the clouds to the right "is lava exploding into the ocean". Wow!

PS. In the APOD explanation it states "illumination from the city lights of Hilo creates an eerie, greenish glow in the clouds" but it is reddish, not greenish, on my monitor so I wonder if that is incorrectly set or does it not appear greenish to others?

On my monitor (which I keep calibrated) the lights of Hilo are distinctly sodium yellow, and the sky above that has a red cast. The lights of another town are to the right, also sodium yellow (I'd guess that's the town of volcano). And there is diffuse sodium glow to the northeast, presumably from the coastal towns north of Hilo. I see no red glow to the right at all; nothing to suggest the glow sometimes seen from lava.

That said, Pacholka's images are virtually always heavily processed (I'd say grotesquely so, but aesthetics are personal) and this image is no exception. In my opinion, the sky colors are moderately distorted, and it's hard to say what that processing has done with other light sources. The sodium lighting is distinctly shifted from yellow-orange to yellow, however.

On my monitor, which i haven't touched since i got the computer, the lights of Hilo (just beyond the volcano cones) are a sort of yellowish tinged green. But just to the right, there's a bright yellow patch.

From my memory Cygnus looks more rotated at this latitude(43.7 N) so the head of the Swan is pointed upward. The Southern Cross, in this photo, appears upright as it did in this APOD

http://apod.nasa.gov/apod/ap080707.html

taken from a position near the South Pole. I would expect a similarly rotated Southern Cross. Any reason why it's not?

I still have a hard time imagining it. As to say - Orion appears on its head in the southern hemisphere but upright in the north. If I stood on my head it might appear as it does south of the equator. Maybe a simulation of a well known constellation, changing as one rapidly moves from the northern hemisphere to the southern hemisphere would make a good APOD for people like me. Just don't ask me to do it.

Thanks Chris and Beyond for your responses to my query relating to some colours in the APOD image.

On my screen (also calibrated) the majority of the glow I see is pinky purple (sodium pink?) with a good splash of orange above the central yellow cloud-smear. I can find faint traces of green, mostly top-left with a tiny bit of it low in the sky to the right -- though I can only see those green bits using my color meter, because it expands each pixel to about a millimeter square.

Rob

The way I understand the APOD caption, the traces of green are not found in the sky, but in the cloud deck "below" the sky.

I see a bit of yellow-green in the cloud tops directly below Epsilon Cygni (that's the star closest to the horizon in the Northern Cross in the annotated image). But this bit of green pales in comparison with the large yellow splash near center of the cloud tops, and in the small yellow streak at right.

The sky above the large yellow streak in the clouds is strikingly orange, whereas much of the sky along the rest of the horizon takes on a pinkish-brown tinge. At least on my screen.

Ann