Myleswamy Annadurai was the project director of Chandrayaan-1 and Chandrayaan-2. Chandrayaan-1 was India's first unmanned lunar probe, launched in 2008 and operated until 2009. It made several discoveries about the moon, including the widespread presence of water molecules and that the moon was once completely molten. However, the star sensors failed after nine months and the spacecraft suffered excessive radiation, leading to its orbit being raised and earlier end of mission than planned.

2. MYLSWAMY ANNADURAI
• BORN ON 2ND JULY 1958
• OBTAINED HIS M.E DEGREE IN ELECTRONICS
IN 1982.
• IN THE SAME YEAR HE JOINED IN ISRO
• PROJECT DIRECTOR OF CHANDRAYAAN-1 AND
CHANDRAYAAN -2 .

3. ABOUT CHANDRAYAN
• IT IS A MOON – TRAVELER OR MOON VEHICLE.
• IT WAS INDIA’S FIRST UNMANNED LUNAR PROBE.
• IT WAS LAUNCHED BY ISRO IN OCTOBER 2008
FROM SRIHARI KOTA IN ANDRAPRADESH AND
OPERATED UNTIL AUGUST 2009 .
• THE MISSION INCLUDED A LUNAR ORBITER AND
A IMPACTOR.
• IT CARRIED FIVE ISRO PAYLOADS AND SIX
PAYLOADS FROM OTHER SPACE AGENCIES
INCLUDING NASA, ESA, AND THE BULGARIAN
AEROSPACE AGENCY WHICH WERE CARRIED FREE
OF COST.

4. • CHANDRAYAAN OPERATED FOR 312 DAYS AND
ACHIEVED 95% OF ITS PLANNED OBJECTIVES.
• THE FOLLOWING ARE ITS ACHIEVEMENTS:

6. The discovery of wide spread presence of water
molecules in lunar soil.

7. CHANDRAYAAN’S MOON MINERALOGY MAPPER
HAS CONFIRMED THAT MOON WAS ONCE
COMPLETELY MOLTEN.

8. EUROPEAN SPACE AGENCY PAYLOAD
CHANDRAYAAN-1 X-RAYS IMAGING
SPECTROMETER (CXIS)- DETECTED MORE
THAN TWO DOZEN WEAK SOLAR FLARES
DURING THE MISSION.

9. THE TERRAIN MAPPING
CAMERA ON BOARD
CHANDRAYAAN-1 HAS
RECORDED IMAGES OF
THE LANDING SITE OF US
SPACE CRAFT APOLLO-15 ,
APOLLO-11.

10. • IT HAS PROVIDED HIGH-RESOLUTION
SPECTRAL DATA ON THE MINERALOGY OF THE
MOON

11. • LUNAR LASER RANGING INSTRUMENT (LLRI)
COVERED BOTH THE LUNAR POLES AND
ADDITIONAL LUNAR REGION OF INTEREST.

12. • THE X-RAY SIGNATURES OF ALUMINUM,
MAGNESIUM AND SILICON WERE PICKED UP
BY THE CXIS X-RAY CAMERA.

13. • THE BULGARIAN PAYLOAD CALLED
RADIATION DOSE MONITOR(RADOM) WAS
ACTIVATED ON THE DAY OF LAUNCH ITSELF
AND WORKED TILL THE MISSION END.

14. • MORE THAN 40000 IMAGES HAVE BEEN
TRANSMITTED BY CHANDRAYAAN CAMERA IN
75 DAYS.

15. • THE TERRAIN
MAPPING CAMERA
ACQUIRED IMAGES
OF PEAKS AND
CRATERS.THE MOON
CONSISTS MOSTLY OF
CRATERS.

16. • CHANDRAYAAN BEAMED BACK ITS FIRST
IMAGES OF THE EARTH IN ITS ENTIRETY.

17. • CHANDRAYAAN-1 HAS DISCOVERED LARGE CAVES ON
THE LUNAR SURFACE THAT CAN ACT AS HUMAN
SHELTER ON THE MOON.

18. FLAWS
• After the completion of all the major mission
objectives, the orbit of Chandrayaan-1 spacecraft,
which was at a height of 100 km from the lunar surface
since November 2008, had to be raised to 200 km due
to malfunctions.
• The orbit raising manoeuvres were carried out
between 09:00 and 10:00 IST on 19 May 2009.
• The spacecraft in this higher altitude enabled further
studies on orbit perturbations, gravitational field
variation of the Moon and also enabled imaging lunar
surface with a wider swath.
• However, it was later revealed that the true reason for
the orbit change was that it was an attempt to keep
the temperature of the probe down.

19. SENSOR FAILURE
• The star sensors, a device used for pointing
attitude determination (orientation), failed in
orbit after nine months of operation.
• Afterward, the orientation of Chandrayaan was
determined using a back-up procedure using a
two-axis Sun sensor and taking a bearing from an
Earth station.
• This was used to update three axis gyroscopes
which enabled spacecraft operations.
• The second failure, detected on 16 May, was
attributed to excessive radiation from the Sun

20. That’s it folks !!