наноспутники – Electron – Mahia – 21.01.2018, 01:43 UTC

[Старый]

Как я понимаю это первая действительно любительская ракета? 
Ребят можно поздравить. А Лин пролетел. 

[Старый]

Василий Ратников пишет:
еще один пруф что человечество достаточно развилось для того что бы слить в унитаз все пафосные рассуждения о том что космос это для избранных, деды все уже сделали в 6х годы, что надо иметь огромный роскосмос с десятками тысячами офисных сидельцев которые будут бумажки перекладывать, что запуски надо охранять автоматчиками от нападения конной лавы татаромонгол и тд и тп.

Да ладно! Ракеты-носители давно уже не считаются хайтеком и доступны любому у которого есть деньги и желание. Во всём остальном мире кроме этой страны, естественно.

[поц]

tnt22 пишет:

Rocket Lab ‏Подлинная учетная запись @ RocketLab 11 ч. назад

The Humanity Star will only be on orbit for around nine months , so you'll need to be quick to catch a glimpse. Track its location on @ TheHumanityStar website.

Где-то до сентября-октября...

Obj. 43168 HUMANITY STAR decay prediction: March 29, 2018 ± 7d

[tnt22]

Jonathan McDowell‏Подлинная учетная запись @planet4589 9 мин. назад

Here's the plot I made of Humanity Star's rapid orbital decay

[tnt22]

Rocket Lab‏Подлинная учетная запись @RocketLab 5 ч. назад

One of the first images from Dove Pioneer, the @planetlabs satellite we launched on #StillTesting in January this year. This beautiful shot was taken over San Eduardo de Chapadmalal, Argentina.

[tnt22]

Jonathan McDowell‏Подлинная учетная запись @planet4589 4 ч. назад

The @RocketLab Humanity Star satellite latest orbit data(9 hr ago) is 217 x 234 km. It's down 22 km since 24 hours earlier. @SpaceTrackOrg predicts reentry between 5 and 15 hours from now

[tnt22]

Jonathan McDowell‏Подлинная учетная запись @planet4589 3 ч. назад

New orbit data for Hu Star, epoch 4 hours ago: 205 x 225 km and new reentry prediction: 1130 to 1730 UTC, 8 to 14 hours from now. Center of window trending later.

[tnt22]

Jonathan McDowell‏Подлинная учетная запись @planet4589 44 сек. назад

Humanity Star latest orbital data, epoch 2 hours ago: orbit 198 x 207 km, down 22 km in last 12 hours. No update to reentry window, still 1130 to 1730 UTC (5 to 11 hours from now). Currently heading S over S Atlantic towards Antarctic

[tnt22]

Jonathan McDowell‏Подлинная учетная запись @planet4589 2 ч. назад

Humanity Star latest orbit data (3 hours ago): 169 x 190 km (above geoid). New reentry estimate from Space-Track is 1246 to 1344 UTC; it is now 1347 UTC so HS has probably reentered by now

2 ч.2 часа назад

During that window HS passed over the Indian Ocean, central Asia, the Arctic and Alaska

2 ч. назад

The Asian part of the track passed over Pakistan, Uzbekistan, Kazkhstan, Tyumen, Yenisei Gulf. We may get a more accurate reentry time later, but wanted to point out even after reentry the location can be very uncertain

[tnt22]

Jonathan McDowell‏Подлинная учетная запись @planet4589 16 мин. назад

Space-Track has issued the decay notice - Humanity Star has reentered. No revision to the entry window, was sometime in the 1246-1344 UTC range, somewhere on the white-colored track in Marco's map.

Dr Marco Langbroek‏ @Marco_Langbroek 4 ч. назад

The @TheHumanityStar could be reentering about now, over southern Asia: (see also previous two tweets)

[tnt22]

http://spaceflight101.com/humanity-star-re-entry/

Rocket Lab's Humanity Star Re-Enters after Brief Tenure in Orbit
March 22, 2018

Rocket Lab's Humanity Star – Photo: Rocket Lab

Rocket Lab's "Humanity Star" ended a short-lived stint in orbit as a shooting star on Thursday, re-entering Earth's atmosphere just two months after being placed into orbit as a public awareness project by the U.S./New Zealand launch services provider. Resembling an oversized disco-ball, the small, passive satellite was to provide "a bright symbol and reminder to all on Earth about our fragile place in the universe."

Спойлер

The Humanity Star was lifted into orbit by Rocket Lab's Electron launch vehicle on January 21 on its second test flight, dubbed "Still Testing." A similar satellite had been on the rocket's inaugural mission in May 2017, but failed to reach orbit when Electron's flight was terminated due to a misconfigured piece of telemetry equipment on the ground.

Rocket Lab kept quiet about the existence of the Humanity Star and only revealed its presence in orbit days after the successful Still Testing mission, along with news that the launch had carried a previously unannounced kick stage the company plans to employ on future operational missions for additional maneuverability in orbit.

The Humanity Star itself only weighed 10.34 Kilograms and was around one meter in diameter, featuring 76 highly reflective panels on the outside of the geodesic sphere to direct sunlight back to observers on Earth – creating a strobe effect resulting from the satellite's spinning motion. Rocket Lab's motivation behind launching the satellite was to place an easily visible object into orbit to "create a shared experience for everyone on the planet" and "encourage everyone to look up, ponder humanity's place in the universe and think about how we can work together as one species to solve the challenges facing us all."

Because of its reflective hull, the Humanity Star was easily visible to the naked eye with an apparent brightness around magnitude 4.5 to 7, peaking at a maximum brightness at 1.6 during flashes to match the brightness of the stars around it. A number of observers shared photos and videos of Humanity Star on Social Media, showing the satellite as a fairly dim object between the very brief flashes caused by its reflective surfaces.

Humanity Star‏ @TheHumanityStar 12 февр.

The Humanity Star, as spotted by Kieran Fanning on 28 Jan 2018 from Banks Peninsula, NZ, looking over Kaitorete Spit. Have you seen it yet? Track it at http://www.thehumanitystar.com  Share your pics and video of passes with us. You'll need to be quick - passes only last a few seconds!

Some discussion emerged after the satellite's launch among the astronomical community since reflective objects can interfere with astronomical observations by ground- and space-based observatories. Claims of "vandalism in the skies," "space garbage," "pollution of the last great wilderness," were made by one side of the light pollution debate while others argued that flares by Humanity Star would be few and far in between compared to those of existing satellites including craft with large deployables or reflective areas like the first Iridium generation. Compared to Iridium that operated a spread-out constellation of 66 satellites, Humanity Star was only a single source making infrequent visible passes over any given observation location and its orbital life was limited from the start.

Humanity Star began its journey in an orbit of 290 by 520 Kilometers, inclined 82.9 degrees, and was expected to have a brief lifetime due to its low orbit and relatively high area-to-mass ratio, making it susceptible to drag experienced in the outer layers of Earth's atmosphere. Rocket Lab had initially estimated the satellite could remain in orbit for around nine months, but its life turned out to be much shorter.

Rocket Lab CEO Peter Beck with Humanity Star – Photo: Rocket Lab

Given its light construction out of one-millimeter thick carbon-fiber composite material, Humanity Star did not pose a threat and was expected to fully burn up on re-entry.

The satellite made its final dive after circling the Earth 951 times, re-entering the atmosphere on March 22nd at 13:15 UTC +/-29 minutes, according to the Joint Space Operations Center that tracks all sizeable objects in orbit and pin-points re-entry events. The large uncertainty in the entry time corresponds to a long stretch of the satellite's ground-track from Antarctica, across the Indian Ocean, over South and Central Asia and the Arctic Sea, all the way to Alaska and the northern Pacific.

Rocket Lab said on its website that the company has no plans for launching another Humanity Star: "The Humanity Star is designed to be a one-time, short-term experience. The intention was always to draw more people to the night sky, perhaps those who may not otherwise be looking."

Re-Entry Data

NORAD ID: 43168
Object: Humanity Star
Type: Public Awareness / Space Art
Mass: 10.34kg
Origin: NZ
Inclination: 82.9°

Launch: January 21, 2018 – 01:43 UTC
Launch Vehicle: Electron (Still Testing)
Launch Site: Mahia LC-1, New Zealand

Re-Entry Prediction: March 22, 2018 – 13:15 UTC +/- 29 Minutes
Re-Entry Zone: Unknown

Re-Entry Orbit

Image: Spaceflight101/Orbitron

[свернуть]

[tnt22]

Dr Marco Langbroek‏ @Marco_Langbroek 4 апр.

(1/5) Remember @TheHumanityStar, and how its builders @RocketLab claimed it would be visible for 9 months? While in reality it lasted a mere 60 days on orbit, before reentering on March 22? We all have wondered about that discrepancy...

4 апр.

(2/5) Did @RocketLab model it at all? Where did they pull their 9 months from?

4 апр.

(3/5) Out of curiosity (*) I modelled the expected @TheHumanityStar orbital lifetime myself today, to see if the resulting expected orbital lifetime was near 60 days or 9 months. (* and to validate my orbital lifetime estimates for an upcoming launch)

4 апр.

(4/5) The #modelling was done in GMAT with the MSISE90 model atmosphere, a low solar activity regime and known @TheHumanityStar specs for mass and size. My modelling had a TLE from 4 days after launch as the starting point.

4 апр.

(5/5) My result was a modelled orbital lifetime for @TheHumanityStar of 51 days (i.e. my result was 85% of the real orbital lifetime of 60 days). So if @RocketLab had modelled it, they really should have known better than to claim 9 months. Weirdly sloppy.


4 апр.

(6/6) Added note: there are somewhat different figures for mass and size floating around too: 10 kg and 1 meter (although 3 feet = 0.91 meter). Modelling with those too now.

4 апр.

(7/7) Okay: those figures (1 meter diameter, 10.34 kg mass) give an orbital lifespan of 53 days, 2 days more than the previous model run.