Cassini's Moon Maiden at Promontorium Heraclides - this is a Clair-Obscur effect.
Clair-Obscur have no scientific importance and are just tricks of the
light that make us think we see something like a letter of the alphabet
or a shape or face. Clair-Obscur effects are scientifically pointless
to observe. However, if you want to be thrilled, or obtain an image to
impress someone then give them a go. If you do observe, or image this,
by all means send your observation into ALPO or the BAA, but we
probably won't publish, but will nevertheless retain in our archives,
just in case features elsewhere in the image are of interest to
future researchers.
ALPO Request: How dark is the shadow? Is the darkness affected
by observing conditions? Any visual descriptions, sketches, or
images should be emailed to:
t o n y . c o o k @ a l p o - a s t r o n o m y . o r g
BAA Request: On 1974 Sep 29 Chris Lord (UK) may have detected
a hint of colour inside this crater by using Wratten 25 (red)
and 44a (blue-green) filters. Please try to observe visually
with similar colour filters and see in which the floor looks
darker. Alternatively use a colour camera and see if you can
detect colour this way. The minimu size telescope to use for
this should be of aperture 15cm. Please send any high
resolution images, detailed sketches, or visual descriptions
to:
a t c @ a b e r . a c. u k .
BAA Request: Two observers have reported colour on the rim
around this colongitude, once in 1938, and again in 2013. Please
take a look and report what you see, and where on the rim.
Please send any high resolution images, detailed sketches, or
visual descriptions to: a t c @ a b e r . a c. u k .
BAA Request. Please observe visually or image this crater in
colour to see if you can detect any colour on part of the
floor. Please email any observations to:
a t c @ a b e r . a c. u k .
BAA Request: Please compare the brightness of Aristarchus
with Proclus, Censorinus, or any other similar sized bright
crater, over time e.g. every 5 or 10 min. Can you see any
changes in brightness? If so which crater is the one that is
varying Apertures as small as 2" diameter can be used for
this work, so long as the magnification is of the order of
100x. Please send all brightness meaurements or image
sequences to:
a t c @ a b e r . a c. u k
BAA Request: Cyrillus. There is a small white craterlet just
north of the three central peaks. We are interested to receive
high resolution images of this in order to find out at what
selenographic colongitude, in the lunar evening, that it loses
it's white spot appearence. Please use scopes largher than 6
inches in diameter.
Please email these to: a t c @ a b e r . a c . u k
These can only be observed using low-light level cameras running at 25 frames per sec,
or faster, and capable of recording 9th or 10th magnitude stars in real time.
Dates/UTs of observing runs, or detections of impacts, should be emailed to:
ALPO - email: c u d n i k @ s b c g l o b a l . n e t
BAA - email: a t c @ a b e r . a c . u k
UAI - email: a m . 5 4 8 5 2 @ g m a i l . c o m
These can only be observed using low-light level cameras running at 25 frames per sec,
or faster, and capable of recording 9th or 10th magnitude stars in real time.
Dates/UTs of observing runs, or detections of impacts, should be emailed to:
ALPO - email: c u d n i k @ s b c g l o b a l . n e t
BAA - email: a t c @ a b e r . a c . u k
UAI - email: a m . 5 4 8 5 2 @ g m a i l . c o m
These can only be observed using low-light level cameras running at 25 frames per sec,
or faster, and capable of recording 9th or 10th magnitude stars in real time.
Dates/UTs of observing runs, or detections of impacts, should be emailed to:
ALPO - email: c u d n i k @ s b c g l o b a l . n e t
BAA - email: a t c @ a b e r . a c . u k
UAI - email: a m . 5 4 8 5 2 @ g m a i l . c o m
These can only be observed using low-light level cameras running at 25 frames per sec,
or faster, and capable of recording 9th or 10th magnitude stars in real time.
Dates/UTs of observing runs, or detections of impacts, should be emailed to:
ALPO - email: c u d n i k @ s b c g l o b a l . n e t
BAA - email: a t c @ a b e r . a c . u k
UAI - email: a m . 5 4 8 5 2 @ g m a i l . c o m
These can only be observed using low-light level cameras running at 25 frames per sec,
or faster, and capable of recording 9th or 10th magnitude stars in real time.
Dates/UTs of observing runs, or detections of impacts, should be emailed to:
ALPO - email: c u d n i k @ s b c g l o b a l . n e t
BAA - email: a t c @ a b e r . a c . u k
UAI - email: a m . 5 4 8 5 2 @ g m a i l . c o m
Monte Caucasus: "shadow face" silhouette Clair-Obscur effect.
Clair-Obscur effects have no scientific importance just tricks
of the light that make us think we see something like
a letter of the alphabet or a shape or face. Clair-Obscur
effects are scientifically useless to observe. However, if
you want to be thrilled, or obtain an image to impress someone
then give them a go. This effect on the southern end of Montes
Caucuses looks like the side silhouette of a cartoon human face.
We are still slightly undertain about the precise colongitude
range, so if you do not see the face, try again later. If you
do observe, or image this, by all means send your observation
into ALPO or the BAA, but we probably won't publish, but will
nevertheless retain in our archives, just in case features
elsewhere in the image are of interest to future researchers.
Note that we have some uncertainty in the colongitude range
- so if you don't see it, please tells us the date and UT so
we can make some improvements in the predictions.
These can only be observed using low-light level cameras running at 25 frames per sec,
or faster, and capable of recording 9th or 10th magnitude stars in real time.
Dates/UTs of observing runs, or detections of impacts, should be emailed to:
ALPO - email: c u d n i k @ s b c g l o b a l . n e t
BAA - email: a t c @ a b e r . a c . u k
UAI - email: a m . 5 4 8 5 2 @ g m a i l . c o m
ALPO Request: What can you see in the way of a light patch
inside the crater (of a diameter of approximately 10km). If
visible, how long does it last for? If imaging, make sure you
allow a suitable exposure. If visual observing, sometimes a
lower magnification can help to improve image contrast. Please
use a telescope of aperture 20cm or larger. Any visual
descriptions, sketches, or images should be emailed to:
t o n y . c o o k @ a l p o - a s t r o n o m y . o r g
These can only be observed using low-light level cameras running at 25 frames per sec,
or faster, and capable of recording 9th or 10th magnitude stars in real time.
Dates/UTs of observing runs, or detections of impacts, should be emailed to:
ALPO - email: c u d n i k @ s b c g l o b a l . n e t
BAA - email: a t c @ a b e r . a c . u k
UAI - email: a m . 5 4 8 5 2 @ g m a i l . c o m
BAA Request: On 2012 Sep 24 E. Horner noticed a very strong red
colour around part of the sunlit inner rim of Copernicus,
sometimes a 1/4 and sometimes 1/2 around the interior. Quite
likely this was some form of atmospheric spectral dispersion -
though the observer checked for similar effects on other craters
but saw none. But to be sure we would like to obtain some colour
images or visual observations of this crater. The minimum sized
telescope to be used would ideally a 6" reflector. Low elevation
angles for the Moon are ideal as we want to try to replicate
this effect if it is indeed due to atmospheric spectral
dispersion. Please send any high resolution images, detailed
sketches, or visual descriptions
to: a t c @ a b e r . a c. u k .
"Jewelled Handle": in Montes Jura - this is a Clair-Obscur effect. Its
an illuminated arc. Clair-Obscur have no scientific importance and are
just tricks of the light that make us think we see something like a
letter of the alphabet or a shape or face. Clair-Obscur effects are
scientifically pointless to observe. However, if you want to be
thrilled, or obtain an image to impress someone then give them a go.
If you do observe, or image this, by all means send your observation
into ALPO or the BAA, but we probably won't publish, but will
nevertheless retain in our archives, just in case features elsewhere
in the image are of interest to future researchers.
BAA Request: Bullialdus. We are trying to replicate,
using modern day images, a sketch in Plate II in BAA The Moon
from published: 1950 Jun Vol 1, No. 1. It is for a sketch made
by L.F. Ball from 1949 Mar 09. The original sketch was
made with an 10" telescope. Please send any images to:
a t c @ a b e r . a c. u k .
BAA Request: Is there a bright spot on the west interior wall of
this crater? Compare it to other features and note if it varies
in brightness over time. Please send all reports or images to:
a t c @ a b e r . a c. u k
ALPO Request: On 2013 Apr 22 Paul Zellor noticed that the two
closely spaced NW dark bands in Aristarchus had some (non-blue)
color to them. Can we confirm his observation of natural colour
here? Ideally you should be using a telescope of 10" aperture, or
larger. Please send any high resolution color images, detailed
sketches, or visual descriptions to: a t c @ a b e r . a c. u k .