-
Orbital collision: Zenit-2 debris with Yunhai-1-02 - 18 Mar 2021 by FutureSpaceTourist on 15 Aug, 2021 05:20
-
https://twitter.com/planet4589/status/1426771798276943872Quote
Space-Track catalog updated today with a note for object 48078, 1996-051Q: "Collided with satellite".
This is a new kind of comment entry - haven't seen such a comment for any other satellites before. Let's look a bit closer:
twitter.com/planet4589/status/1426772382610595847Quote48078 is a small debris object from the Zenit-2 rocket that launched a Tselina-2 electronic spy sat in Sep 1996. Between 1997 and 2021, 8 debris objects were tracked from the rocket. This one, added to the catalog in Mar 2021, has only a single element set, epoch 2021 Mar 16
https://twitter.com/planet4589/status/1426772812212154371QuoteI conclude that they probably only spotted in tin the data after it collided with something and that's why there's only one set of orbital data. So the collision probably happened shortly after the epoch of the orbit. What did it hit?
twitter.com/planet4589/status/1426773077220855808QuoteThe obvious candidate is Yunhai-1-02, which broke up on Mar 18 for unknown reasons. So it will be interesting to compare the orbits of the objects around then
https://twitter.com/planet4589/status/1426774130695843843QuoteAnd indeed, a quick analysis of the TLEs show that Yunhai 1-02 (44547) and debris object 1996-051Q (48078) passed within 1 km of each other (so within the uncertainty of the TLEs) at 0741 UTC Mar 18, exactly when 18SPCS reports Yunhai broke up.
twitter.com/planet4589/status/1426774988812587008Quote37 debris objects (green) have been cataloged so far from the breakup - there are likely to be more. This looks to be the first major confirmed orbital collision in a decade.
Edit to add:
https://twitter.com/planet4589/status/1426775610039443460QuoteNevertheless it appears that the Yunhai satellite is still under control and able to make orbit adjustments (blue dots) so the collision was not catastrophic?
-
#1 by FutureSpaceTourist on 15 Aug, 2021 05:32
-
Yunhai-1-02 launch thread noted issues with the satellite back in March:
https://forum.nasaspaceflight.com/index.php?topic=49070.0 -
#2 by FutureSpaceTourist on 15 Aug, 2021 05:59
-
https://twitter.com/planet4589/status/1426782910233911298Quote
So where did this debris object come from? The large 9-tonne Zenit second stages in the higher part of LEO have long been identified as a major source of collision risk. But this wasn't the stage itself but a piece that came off it. Let's look at the objects from this 1996 launch
twitter.com/planet4589/status/1426783200291008515QuoteObject A was Kosmos-2333, a Tselina-2 spy sat. Object B is the Zenit rocket stage that put it in orbit. Objects C,D,E,F are small separation motor covers ejected to a higher orbit. Let's look at the remaining debris objects G to Q.
https://twitter.com/planet4589/status/1426783631155077122QuoteG,H, J, K, L appear to have come off at launch. G and H must be fairly dense and their orbits have not decayed much. J, K and L were light things that have now reentered.
twitter.com/planet4589/status/1426784625364451331QuoteM and M [N?] came off the rocket stage (probably) sometime in 2009. They are decaying at a moderate rate but will be in orbit a few more years.
P was cataloged in 2018 but may have been around a lot longer - its orbit is not decaying quickly.
https://twitter.com/planet4589/status/1426784857200463877QuoteWe don't have enough data on object Q to say much about it. (Yeah, ok, make all your jokes about Q being anonymous. Just don't @ me with them.)
twitter.com/planet4589/status/1426785191561994242QuoteBut what we can say is there's no evidence that this Zenit rocket stage has broken up. Just small things flaking off it in separate incidents over the years.
https://twitter.com/planet4589/status/1426785734481125379QuoteNevertheless, even small things can cause serious damage when they hit your satellite at orbital velocity, as this incident shows.
Goodnight!
-
#3 by FutureSpaceTourist on 15 Aug, 2021 07:47
-
https://twitter.com/planet4589/status/1426786983028875266Quote
Oh, one more thing: the Gabbard diagram for the Yunhai debris objects. Most of the objects are in high orbits, but a couple have perigees close to ISS altitude (and some of the rest will eventually decay to that altitude)
-
#4 by FutureSpaceTourist on 15 Aug, 2021 16:34
-
twitter.com/planet4589/status/1426941562605477894Quote
Further detail on the Yunhai 1-02 collision: it occurred at 0741:19 UTC 2021 Mar 18, 780 km above Tromso, Norway (at 19.4E 70.9N), at a relative velocity of 13.26 km/s (for the metrically impaired, that's 29660 mph) [red: Yunhai; magenta: debris object 48078]
https://twitter.com/planet4589/status/1426941821083656199QuoteOrbit of Yunhai was 780 x 785 km x 98.5 deg, in 0716 LTDN sun-synch orbit. Orbit of the debris object was 748 x 939 km x 71.1 deg.
-
#5 by StarshipSLS on 15 Aug, 2021 16:40
-
Did the debris do anything to the satellite?
-
#6 by Yiosie on 18 Aug, 2021 08:22
-
Space.com has published an article on the collision:
Space collision: Chinese satellite got whacked by hunk of Russian rocket in March -
#7 by tommyroland on 24 Aug, 2021 03:05
-
Vitamix E310 vs Vitamix 5200
If you put “the best blenders” into the search box, there’s a high probability that online best reviews guide on Thekinglive.com you to Vitamix blenders. And the E310 is the newest addition to the Explorian series of Vitamix. Some might call this the upgraded version to the Vitamix 5200, which is a popular option coming from the immediate past series from the well-known brand.
However, with them making smoothies all the same and being from the same manufacturer, it’s really hard to tell for many beginners what’s the difference between these powerful machines. Why choose one over another when they’re practically the same? To answer this question as well as shedding more light on the hidden gems that these Vitamix products offer, the following short guide will attempt to show you clearer what would be the superior option.
THE ENGINEERING
The best way to compare similar machines is to look into its inner machinery. Both the Vitamix E310 and the Vitamix 5200 possess a 2 horsepower engine. Both machines also possess similar control options, comprising an on/off switch and a rotating button with variable speed adjustments from 1 to 10. The deal breaker is therefore the outer aesthetic design of each blender. The 5200 one is a little bit rougher with the square edges, while the E310 has rounded smooth edges.
CONTAINER
If you think the only difference between the E310 and the 5200 is just the looks between them, then you’re both right and wrong. You’re right, because both machines have the same motor engine and can make almost identical drinks with similar quality. And you’re wrong, because among the aesthetic differences between the two is the difference between the containers. The containers are not just looking different, but they’re also designed differently for each model.
For the E310, you might think that its container is the bigger one among the two. But actually, this container can only hold around 48 ounces despite how spacious it looks. On the upside, a bigger container means bigger blades and this top reviewed blender is more suitable for processing foodstuff and ensuring the consistency of the whole batch.
Check Over: TOP product evaluated on TheKingLive.com
For the 5200, its container can hold up to 64 ounces despite how optically smaller it looks. This is because in spite of being smaller diametrically, the container of this model is a lot taller than the container of the E310. This is both good and bad because while it lets the container hold more, it does make it more difficult for you to store it in a cabinet due to its height.
Nonetheless, the most noticeable difference between these containers is the handle of each one. The handle of the 5200 container is protected by a layer of good quality rubber, while the handle of the E310 container is left naked.
WARRANTY
The 5200 model offers a longer warranty with 7 years. The E310 model only offers a warranty of 5 years. And both of these are extendable for 3 more years by simply paying extra $75. We do think that warranty is an important tiebreaker factor in order to find the best products.
CONCLUSION
Other than some capacity differences and some minor different design choices, these two are practically the same machine producing almost identical results that will definitely satisfy anyone. It’s exactly because of this that they often steal the top spots on the top review lists. Find yours today on TOP-Rated Products from TheKingLive.com. -
#8 by Yiosie on 25 Aug, 2021 22:02
-
Did the debris do anything to the satellite?
Are there any adverse effects on the satellite?
Space.com article states that signals are still being received from Yunhai 1-02, though we don't know if it remains operational or is able to perform properly. The debris hit may have been a glancing blow that destroyed a solar panel or something. -
#9 by dondar on 26 Aug, 2021 07:38
-
Reasonable speculation would be the piece of thermal isolation cloth from Zenith stage (apparently they used for very long time adhesive instead of mechanical fasteners) hit solar panel of the Chinese craft.
-
#10 by High Up on 26 Aug, 2021 14:38
-
Do we know if there are any predicted follow-on impacts to other satellites operating in this inclination and altitude (outside of the ISS)?