[amsat-bb] LongJiang 1 & 2 arrive at the Moon
hamsat at xs4all.nl
Fri May 25 16:25:21 UTC 2018
It is confirmed from China that LongJiang 2 has performed a
successful braking maneuver, so that it is now in lunar orbit.
No further details yet.
On 25-05-18 15:53, Nico Janssen wrote:
> Yes, you should see a sudden change in the doppler curve. And that
> would be a welcome confirmation of a successful maneuver.
> If you also can receive the LJ 1 S band downlink it would be extra
> interesting to see what happens to that signal.
> 73, Nico
> On 25-05-18 15:47, Jordan Trewitt wrote:
>> If we have our S band antennas pointed up there, shouldn't we be able
>> to see the braking maneuver with the Doppler shift? Assuming the moon
>> (or Earth) doesn't block the signals.
>> On Fri, May 25, 2018 at 8:22 AM Nico Janssen <hamsat at xs4all.nl
>> <mailto:hamsat at xs4all.nl>> wrote:
>> The Chinese microsats LongJiang 1 & 2 have arrived at the Moon.
>> On 2018-05-25 between 14:00 and 15:00 UTC they are expected to pass
>> the Moon at a distance of about 300 km. At that time they should
>> perform a braking maneuver so that they can enter a high elliptical
>> 300 x 9000 km orbit around the Moon. The planned orbit inclination
>> is unknown.
>> Unfortunately there is virtually no information on these satellites
>> coming from China. It is not clear if LJ 1 is recovered.
>> Telemetry is
>> being received from the S band downlink of LJ 2 at 2275.22 MHz.
>> All other information, including recent orbital data, is missing.
>> Note that the usual satellite tracking programs and regular TLE
>> data can not be used for tracking satellites near the Moon. You
>> really need specific deep space tracking software and orbital
>> elements. TLE sets for the LongJiangs that were published earlier
>> have no value at all now that these satellites are in the
>> vicinity of
>> the Moon. Again I would like to refer to my web page on this
>> Nico PA0DLO
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