Quote from: John Alan on 12/28/2015 05:40 amDSCOVR was the fast and hot one way downrange... Can you confirm or deny my recollections of no boostback burn and 8x kinetic energy at atmospheric interface for DSCOVR? Looking back I see that DSCOVR was the one that was headed to the ASDS but the ASDS was not in position due to a severe storm out there. It did have a landing on the water surface that was within 10M, which is IIRC, the first to do so. Interesting discussion but very OT, so I'll just throw this in "SES-9".
DSCOVR was the fast and hot one way downrange...
Elon Musk – Verified account @elonmuskRocket reentry will be much tougher this time around due to deep space mission. Almost 2X force and 4X heat. Plenty of hydraulic fluid tho.11:43 AM - 8 Feb 2015
https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=initial&application_seq=69076&RequestTimeout=1000Barging may occur after all. That's interesting (GTO-1800? sub-synchronous flight?)NET 23-JAN-2016Barge location (its far away this time, about 660km out)...
Doesn't 1800 m/sec reflect a lower perigee than the somewhat standard 1500 m/sec?
(Isn't 1800 m/sec the velocity change needed to circularize at Geo? Doesn't 1800 m/sec reflect a lower perigee than the somewhat standard 1500 m/sec?)
Still holding out for an RTLS.
Quote from: The Amazing Catstronaut on 01/04/2016 03:43 pmStill holding out for an RTLS.I'd be very impressed if SES-9 flight had the performance to do a RTLS...
Quote from: Dante80 on 01/04/2016 03:10 pmhttps://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=initial&application_seq=69076&RequestTimeout=1000Barging may occur after all. That's interesting (GTO-1800? sub-synchronous flight?)NET 23-JAN-2016Barge location (its far away this time, about 660km out)...I wonder if there will be a "boost back" burn at all on this flight. Perhaps reentry and landing only? - Ed Kyle
I wonder if there will be a "boost back" burn at all on this flight. Perhaps reentry and landing only?
Quote from: edkyle99 on 01/04/2016 04:06 pmI wonder if there will be a "boost back" burn at all on this flight. Perhaps reentry and landing only? My understanding is that they need the boost-back to target the landing site even when its the barge down range. My understanding can be wrong of course.
Quote from: Semmel on 01/04/2016 06:49 pmQuote from: edkyle99 on 01/04/2016 04:06 pmI wonder if there will be a "boost back" burn at all on this flight. Perhaps reentry and landing only? My understanding is that they need the boost-back to target the landing site even when its the barge down range. My understanding can be wrong of course.Yep, that is my understanding as well. A more proper term for the burn may simply be "aiming burn", since it doesn't always result in a boost-back. But it is there to aim the stage to the landing point.
All ASDS recovery attempts since have also done a third boostback-aiming-whatever burn. However, that may have been because SpaceX wanted to test and refine the three-burns required for RTLS--not necessarily because it was absolutely required for ASDS-based recovery.
Ullage issues would cause me to lose sleep...