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Humboldt and Phillips Craters

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#1 frank5817

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Posted 03 April 2024 - 07:30 PM

Humboldt crater (207 km.) is classified as a large floor fractured crater with a very worn-down rim. It is close to the size of a small basin; it could be one if in was about 240 km. or larger in diameter.
The visible inner wall facing my eye is subsided and shows a straight drop off over much of its length. One can see dark volcanic regions along the inner wall of pyroclastic material similar in appearance to the same on the floor of lunar crater Schickard. Although best seen from directly above the crater as seen in orbital images has large circular rilles with long, straight, radiating spoke rilles. One of these rilles was clearly seen at the time of this sketch. These rilles were created by magma uplift from below the crater floor which is convex. Central mountains on the crater floor could be seen as bright albedo features. At the high sun illumination, the N Humboldt crater (14 km.) was seen as a bright oval. On the far eastern floor are three unnamed bright craters, the western most is 6 km. in diameter, the middle one is just over 9 km and is an example of a concentric crater. These three craters are exceedingly difficult to view and require a maximum favorable libration. The far crater is the largest of the three at just under 10 km at the base of the east wall. Crater Phillips (124 km.) is just west of Humboldt.

 

Sketching equipment and  Materials

Master’s Touch Sketching Pad Black drawing Paper 5.5’ x 8”  , 100 lb.
White and Black pastel pencils, white Pearl eraser, blending stumps
Telescope: 16 inch f/ 4.41 Dobsonian and 8 mm eyepiece 224X with barlow 448 x, on Eq. Platform
Date: 03-16-2024, 07:30-09:15 pm local time
Temperature: 15.5° C (60° F)
Partly cloudy, calm, low humidity
Seeing: Antoniadi III
Colongitude 352.5°, Libration in Longitude nearly + 7 °, Latitude – 6 °
Lunation 6.8 days
Illumination 50 %
Altitude: 63 °

Frank 5817

 

Screenshot 2024-04-03 132000.jpg

 

with some labels

DSC07102 - Copy.JPG


  • Special Ed, jonbosley, Jef De Wit and 21 others like this

#2 mdowns

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Posted 03 April 2024 - 08:03 PM

This one has really different subject matter Frank,awesome.May not really be a basin but it sure looks like one. Love how you rendered the cliff walls and small mountains.Unusual and fun,great choice!



#3 frank5817

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Posted 03 April 2024 - 08:20 PM

Michael,

 

Thanks, I have sketched this crater several times in the past but this was the best look I have had in the last decade.

 

Frank smile.gif

 

Thanks for the likes: Michael, Rustler, David T., mitu, Butch, Jef, Josephus, David G., Darren, AstroBoyInTheCity, Tom, nof, Michael, tcifani, deepskywim, Anthony, Tien, Look at the sky, Frank, Michael R., Joe, Optics junkie, Fred, Jon B



#4 niteskystargazer

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Posted 08 April 2024 - 11:17 AM

Frank,

 

Very good sketch of Humboldt and Phillips Craters smile.gif ,

 

CDS,KLU,

 

 thanx.gif,

 

Tom



#5 frank5817

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Posted 08 April 2024 - 03:26 PM

Tom, 

 

Thank you much.

 

Frank :)



#6 Procyon Lotor

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Posted 14 April 2024 - 09:41 AM

Really great work. Awesome!



#7 frank5817

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Posted 14 April 2024 - 10:35 AM

Michael,

 

Thank you, keep on sketching.

 

Frank :)



#8 azure1961p

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Posted 17 April 2024 - 05:05 PM

No easy task drawing that much lunar real estate but you pulled it off.  One of my favorite craters.

 

Pete



#9 frank5817

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Posted 17 April 2024 - 08:04 PM

Pete,

 

Thanks.

It is nice to see it when clearly visible and it was. Even better when there is good shadow contrast which didn't happen at such a high Sun.

 

frank :)



#10 Special Ed

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Posted 18 April 2024 - 09:40 AM

Frank,

 

I missed seeing this sketch when you posted it.  Very nicely done--I'm with Michael Downs--I really like the way you rendered the cliff-like crater wall.  With its location in the zone of libration, I can see why you would jump on a chance to observe it when you had such a favorable libration.  waytogo.gif



#11 frank5817

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Posted 18 April 2024 - 10:57 AM

Hi Michael,

 

Thank you, I have sketches of crater Humboldt right on the limb but they are too foreshortened to reveal much.

 

Best to you,

Frank :)



#12 JMSchwartz

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Posted 20 April 2024 - 09:45 AM

Frank ,very nice sketch of Crater Humboldt  it really gives you the sense of the grand size of this crater.You really need to wait for the right moment and the favorable lighting to capture this splendid view, your extensive knowledge of the Moon and it's phases is apparent in this capture.

Awesome. 

CS Jon 



#13 frank5817

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Posted 20 April 2024 - 09:58 AM

Jon,

 

Thank you for those words, clear skies to you.

 

Frank :)




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