SpaceX to launch twin NASA water cycle tracker satellites
Washington, May 22: On its way to deploy five Iridium Next communications satellites on Tuesday, a SpaceX Falcon 9 rocket will also launch twin NASA satellites that will monitor Earth's water cycle, marking a unique rideshare arrangement.
The satellites are scheduled to launch at 3.47 p.m. EDT from Vandenberg Air Force Base in Central California. (This corresponds to 1.17 a.m. Wednesday India time), NASA said.
The two Gravity Recovery and Climate Experiment Follow-On mission (GRACE-FO) spacecraft will follow each other in orbit around Earth, separated by about 220 km.
On liftoff, the Falcon 9 first-stage engines will burn for approximately two minutes and 45 seconds before shutting down at main engine cutoff (MECO).
The Falcon 9's first and second stages will separate seconds later. Then, the second-stage engine will ignite for the first time (SES1) and burn until the vehicle reaches the altitude of the injection orbit, 490 km.
While this burn is going on, the payload fairing -- the launch vehicle's nose cone -- will separate into two halves like a clamshell and fall away.
When the rocket's second stage has completed its ascent to the injection orbit altitude, it will pitch down (its nose points down) 30 degrees and roll so that one of the twin GRACE-FO satellites is facing down, toward Earth, and the other is facing up, toward space.
Then the second stage engine will cut off (SECO).
About 10 minutes after liftoff, a separation system on the second stage will deploy the GRACE-FO satellites.
Separation will occur over the Pacific Ocean at about 17.5 degrees North latitude, 122.6 degrees West longitude.
The first opportunity to receive data from the spacecraft will occur at NASA's tracking station at McMurdo, Antarctica, about 23 minutes after separation, NASA said.
After the GRACE-FO satellites are deployed, the Falcon 9 second stage will coast for half an orbit before reigniting its engine (SES2) to take the Iridium Next satellites to a higher orbit for deployment.
GRACE-FO, a collaborative mission of NASA and the German Research Centre for Geosciences (GFZ), continues the work of the original GRACE mission in observing the movement of water and other mass around our planet by tracking the changing pull of gravity very precisely.
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KSRTC introduces gender ticketing in buses across Kerala
Thiruvananthapuram (PTI): The KSRCTC on Saturday began implementing gender ticketing in buses operating across the state.
According to a Kerala State Road Transport Corporation (KSRTC) circular issued on Friday, the gender ticketing system is intended to record whether a passenger is a woman, a man or a child in tickets issued on KSRTC buses from Saturday.
To facilitate the system, Electronic Ticketing Machines (ETMs) have been updated.
The circular stated that conductors in all KSRTC depots should record the gender category of passengers while issuing tickets through the ETMs.
Options for women, men, and children have been included in the ETMs to identify passenger categories when issuing tickets.
The printed tickets generated by the ETMs will also indicate the passenger's category, officials said.
The UDF had promised free KSRTC travel for women across the state during the Assembly election campaign.
UDF, which won 102 of 140 seats, would soon form the government after the Congress party finalises the discussion on the next Chief Minister.
The introduction of gender ticketing is being viewed as an effort to estimate the number of women travelling daily on KSRTC buses before implementing the poll promise.
Some conductors have reportedly raised concerns over the additional time required to record passenger details, especially during rush hours.
