welcome to Gareeb Scientist
Today we will learn about worlds highest resolution moon telescope
Made by India
As you know i love talking about Indian Scientists Achievements
and educating you about them
the video will flow in this way
Let's learn :)
THis camera is called OHRC
meaning Orbiter High Resolution Cmaera
This is made by ISRO's SAC( Space Application Center )
The images on your screen
only 3 images in public
So I made a basic 3D model of it to illustrate
This camera is basically a telescope
Its in a Ritchey Chretien telescope configuration
probabaly pronounced it wrong
in this configuration we have a hyperbolic primary mirror
same with the other secondary mirror
light will enter, hit the primary mirror
relect off the primary hit the secondary and go the sensor
before that ISRO has used Field Correction Optics
The primary mirror has a diameter of 30cms
The advantage of this RCT telescope is
Color aberration and Coma is lesser relatively
So les color splitting or distortions
The biggest advantage is we can make the setup a bit compact
important for a space-based mission where space is limited
Even big telescopes like Hubble were an RCT telescope
let me show you a cross-section ISRO had shown in their paper
as you can see the primary mirro
the baffle in between allows light to pass to the sensor
there is a sensor behind , will talk about it later
there is a radiator as well behind
this is to dissipate the sensors hear.
then there are 2 electronic boxes beside
this is attached to the Chandrayaan 2 orbiter
what kind of sensor ?
this is a linscan camera not a snapshot camera
its not a snapshot camera
if you have seen my Spacex's of India
if not then do watch, in the i button
i had spoken about Indias Pixxel startup
how they are using a linscan camera
so basically as you are moving you continuously in orbit
the image keeps getting captured
bear with me here as I get technical a bit
The sensor resolution is 12K by 256
So basically 12000 pixels in one line
and the resolution on surface
is an insane 0.25m per pixel
this is very high resolution for the moon
0.25m per pixel means
that 0.25m square of the surface of the moon will be represented will be a pixel
suppose you have a 4m long bus
then the image will be 16 pixxel long
very high resolution
if i compare Nasa craft on the moon
LRO - Lunar Reconnaissance Orbiter
its resolution is 0.5m in a 50km orbit
its moved to a frozen orbit now
Chandryaan 2 takes 0.25m/pixel images in a 100km orbit
we have to keep one thing in mind though
NASA spacecraft is very old now, almost 9 years old
Let's finally come to images
unfortunately 2 full images with more 2 so total 4 images in public domain
I will tell you when more images will be available later
This image was released by ISRO on their site.
Look at that sharpness
we can even see
the boulders on the surface
Let me show you images from NASA LRO
as you can see this is also pretty sharp
at 0.5m resolution
but obviousy we cant go even further
to see small boulders
but you saw the chandrayaan 2 images
It had even images the landing site in detail before landing. one of its mission
So we had a detailed landing site image before landig
So in case there was any big boulder, Vikram could have avoided it
which is an awesome capability to have
we could potentially share this with others
before their landing
this is another image, picked from one of ISRO's research papers
which they released at LPSC
not sure if this is related to previous image
we can see the boulders clearly
too good of a camera, always impressed with the images
one more advantage of the OHRC is
the low light performance of this camera
is pretty good
if even a little light is going into a dark cratre
it can take good photos of the crater shadows
which is another insane capability
and will be an important one going into the future
although I am praising this camera,
almost every science instrument on chandrayaan 2 is world-class
will try to make dedicated videos on every instrument
Do subscribe
as you can see on the screen this was published in their research papers
they photographed dark crater R1.
and R2 as well
you can see the low light performance
which is pretty good
HOLD ON ! HOLD ON  , editor Gareeb Scientist here
before completion of this video ISRO published a new document
on occasion of chandrayaan 2 orbiter completing 1 year in orbit
there was another image taken by OHRC
really enjoy glancing on these images
look at the quality and sharpness of these images
we should be able to see the apollo sites in detail
if ISRO releases the images
editor gareeb scientist signing off
now let's talk about the other camera
its called TMC2
meaning Terrain Mappin Camera 2
many might get an idea from the name itself
TMC 1 on chandrayaan 1 and TMC 2 on chandryaan 2
This will generate an elevation model
for us to acess the elevation changes on the moon
we can get a proper model from this called as DEM.
as you can see some images on screen
beautiful arent they..
before showing how Vikram might look on the OHRC
if you want to join my private discord server or want monthly ISRO wallpapers , do consider joining
starts at rs 29
lets come to the previous image
these boulders are around 1 to 2m in diameter
vikram was around 2 meters diameter or the longest side
which means if OHRC images Vikram
assuming it has safely landed like some people are claiming
Vikram will be seen , but also its shadow
we can use the shadow to identify the object
so we can know if Vikram has safely landed or not
we will know!!!
we may not identify properly with NASA images
OHRC is too good for such a operation
SO does ISRO have an image of the crash site?
yes they most likely do
last question is...
why is ISRO not releasing this image ?
data is supposed to be released in October
ISRO realises mission data per year per mission
So maybe we maybe we may get the image then
only ISRO can answer
hope you learnt something new, and if possible share
