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James Kerman

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Posts posted by James Kerman

  1. The Hubble Space Telescope has resumed normal operations late Friday, Oct. 26, and completed its first science observations on Saturday, Oct. 27 at 2:10 AM EDT:

    Quote

    Last week the operations team commanded Hubble to perform numerous maneuvers, or turns, and switched the gyro between different operational modes, which successfully cleared what was believed to be blockage between components inside the gyro that produced the excessively high rate values. Next, the team monitored and tested the gyro with additional maneuvers to make sure that the gyro was stable. The team then installed additional safeguards on the spacecraft in case the excessive rate values return, although this is not anticipated.

     

    On Thursday, the operations team conducted further maneuvers to collect gyro calibration data. On Friday, Hubble performed activities similar to science observations, including rotating to point at different sky locations, and locking on to test targets. The team completed all of these activities without issue.

     

    Late Friday, the team began the process to restore the scientific instruments to standard operating status. Hubble successfully completed maneuvers to get on target for the first science observations, and the telescope collected its first science data since Oct. 5. 

    https://www.nasa.gov/feature/goddard/2018/update-on-the-hubble-space-telescope-safe-mode

     

  2. 10 hours ago, unclebeer said:

    I've been flying the docking tutorial for like 3 days now :P

    I don't know if it's changed since I tried but I found it to be a little confusing.  This diagram really helped me (click a few times to enlarge):
    zAxhwQ5.png

  3. 6 hours ago, Flightgames66 said:

    Please, can anyone help me with this? 

    G'day my fellow sand groper. This is how I go interplanetary (some of this information is duplicated up thread but I thought I'd write it up in point form):

    The kerbal subway map is a good source of information on how much dV you will need to get to any planet or moon.

    Duna is a great place to start.  According to the map you need 5090dv to orbit Duna from the surface of kerbin (I'd add 10% for safety and orbital manouvers).  This assumes you follow standard procedures:
    1.  Get to low Kerbin orbit.
    2.  Depart low Kerbin orbit at the correct phase angle - this means leaving at a time when it is most efficient for a Hoffman maneuver to your destination.
    3.  Once you have an intercepting course, warp time to the half way point between Kerbin and Duna.  Perform a course adjustment:
    Create a maneuver node 10 or 20 minutes ahead of your vessel - just place it without changing anything.  Then click on Duna and select focus view - this will change your view to the destination and should show your plotted course in the sphere of influence of your destination.  Rotate your view until you can see both the path through the SOI and the node you just created and you can now use that node to plan and execute a burn that will bring you close to your intended orbit or even into an atmosphere for aerobraking.  The course adjustment is usually very cheap on Dv and you get savings by doing your capture burn nearer your destination planet/moon (benefiting from the Oberth effect).  If you want to RV and dock with a station at Duna then you should make sure that you get close to your target altitude and orbiting in the same direction. 
    4.  (Your OP reads a little ambiguously with regards to docking so I'll add this, just in case) Once you are in orbit (I start with a highly elliptical orbit as it makes the next step cheaper in Dv), match inclination with your target (the slower you are the less Dv it takes so always use the furthest node from the planet or moon). Adjust Ap and Pe until the orbits of both vessels intercept (try to make a slightly higher orbit if your target is behind you or a lower orbit if it's ahead).  Wait until you get fairly close to an intercept and then adjust with a maneuver node until you get really close (I try to get within 300-400m) and with a low speed relative to your target (I like it to be no more than 5 or 6m/s at this stage).  High speed intercepts are possible but will use more monoprop and fray your nerves.  Once you get 400-500m away switch all your attention to the nav ball, making sure its in target mode.  Depending on where your docking point is and if you are faster or slower than your target, you need to match up either the prograde or retrograde marker to the target and slow down to .2 or .3m/s to dock.
    5. Profit!

  4. @Diche Bach Another longevity option that might add an interesting sub plot could be genetic editing or modification like CRISPR technology.  While this is still nascent tech at the moment the potential is there to extend lifetimes and prepare your colonists for the conditions they will encounter at their destination.  Of course this could all go horribly wrong™.

    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4343198/

    https://www.genome.gov/27569222/genome-editing/

     https://ghr.nlm.nih.gov/primer/genomicresearch/genomeediting

  5. 19 minutes ago, The_Cat_In_Space said:

    No pwnage found. Yay?

    That's a good thing.  If your gmail account is not showing unauthorized activity you should be OK - the vast majority of these attacks rely on "social engineering" to get a foothold into your digital life.  If you have clicked any links within these suspect emails you should also scan your machine with a good antivirus and antimalware program like https://www.malwarebytes.com/lp/sem/au/ just to be sure. 

    Another thing you could do is contact your phone service provider (I'm assuming your 2 factor identification uses your phone as the secondary) and make sure there have been no attempts to request a sim swap.

    I can't program a microwave but I am a long time reader of the blog https://krebsonsecurity.com/.  Brian Krebs is a very well regarded internet security reporter and always includes best practice information about these issues.

  6. 13 hours ago, The_Cat_In_Space said:

    What should I do?

    You could try using this service to see if your account has been compromised in a data breach: https://haveibeenpwned.com/ 

    Apparently Gmail records the last 10 logins along with your current session in "Last account activity”.  It shows the location, IP, method, and time when your Gmail was last accessed so you can check to see if there is unusual activity and also allows you to sign out any other running sessions before you change your password.  You should also check the email forwarding page to see if your email is being forwarded to any other addresses.

  7. 3 minutes ago, YNM said:

    Shows up in your actual e-mail

    Yeah, mostly they go to junk mail but the odd one gets through to my inbox.  Most are from "the google team or gmail team" but the addresses are random if I hover over the sender:


    RjuQzhX.png

     

    It's slowed down to a trickle since I started blocking them and I have not seen any "confirmation email" of a new account setup so I assume it's a spam campaign.

  8. For the last month or so I have been getting bombarded with both gmail notifications (although the addresses do not originate from google and I don't have a gmail account) and social media messages from an undisclosed site (i.e. account profiles being unlocked for me and "people" requesting hook ups) even though this forum is the only social media I participate in.  I have not opened any of these emails and blocked them from my account as I believe them to either be phishing attempts or containing malicious code/attachments with no ill effects.

  9. Welcome to the forum, @zherdev.

    What is this Dres you speak of?
    (It's a long running joke in the forum that Dres does not exist and anything you are doing to make it a more interesting destination would be much appreciated)

  10. 8 minutes ago, NSEP said:

    It should be like 10C in Western Europe. 26C is heatwave-level weather, even during summer here.

    I'd like to complain about describing 26C as a heatwave - it's known in Perth as "a lovely day".

    Quote

    The highest temperature recorded in Perth was 46.2 °C (115.2 °F) on 23 February 1991, although Perth Airport recorded 46.7 °C (116.1 °F) on the same day.

    https://en.wikipedia.org/wiki/Perth


     

  11. Ok - I used close to your orbital parameters (158x45km) and a vessel I call the "Mike Tyson".
    MGPFQLK.png

    I used the spaceplane method (nose up) on the way down and EVA'd at 10000m and 800m/s (nav ball in surface mode).  Before ejecting G-force was negligible but Jeb fell unconscious for a second or 2 on EVA so I couldn't test chute deployment in KO conditions.  This vessel is likely draggier than a standard space plane so I have to assume you were coming in faster.
    qxi8Fey.png

    Edit:  So I built a Mk1 pod, Hammer booster and 2 canards (in line with the mk1 ladder) and I'm seeing some strange behavior on EVA at 650m/s and above.  I get spaghettification, KO and Jeb disappears.

  12. 10 minutes ago, Kroslev Kerman said:

    yeah i was

    I just ran a few more tests using a MK1 pod above a hammer SRB, festooned with canards and I can't knock Jeb out.  Unfortunately the G meter does not display on EVA.

    Do you remember what your altitude and speed was?

  13. 28 minutes ago, Kroslev Kerman said:

    my jet pack was off

    I just ran a few tests in sandbox with no results; the chute  worked as advertised.  The only other thing I can think of is if you were descending too fast for your chute to "safely deploy" however this would mean a fall at a velocity that Jeb would be unlikely to survive.

    Perhaps @bewing may be able to assist you?

  14. 35 minutes ago, Kroslev Kerman said:

    the parachute did not open good thing jeb landed in the water

    Good save, Mate!  I think a kerbal needs to be level 3 before they can use chutes.

    Edit: I'm assuming you are playing career mode.

  15. NASA has posted an update:
     

    Quote
    Oct. 13, 2018

    Update on the Hubble Space Telescope Safe Mode

    NASA continues to work toward resuming science operations of the Hubble Space Telescope after the spacecraft entered safe mode due to a failed gyroscope (gyro) on Friday, Oct. 5. 

    Following the gyro failure, the Hubble operations team turned on a backup gyro on the spacecraft. However, that gyro did not perform as expected, reporting rotation rates that are orders of magnitude higher than they actually are. This past week, tests were conducted to assess the condition of that backup gyro. The tests showed that the gyro is properly tracking Hubble’s movement, but the rates reported are consistently higher than the true rates. This is similar to a speedometer on your car continuously showing that your speed is 100 miles per hour faster than it actually is; it properly shows when your car speeds up or slows down, and by how much, but the actual speed is inaccurate. 

    When the spacecraft turns across the sky from one target to the next, the gyro is put into a coarser (high) mode. In this high mode it may be possible to subtract out a consistent large offset to get an accurate reading. However, after the large turns are over, the spacecraft attempts to lock onto a target and stay very still. For this activity, the gyro goes into a precision (low) mode to measure very small movements. The extremely high rates currently being reported exceed the upper limit of the gyro in this low mode, preventing the gyro from reporting the spacecraft’s small movements.

    An anomaly review board that consists of professionals experienced in the manufacturing of such gyros, Hubble operations personnel, flight software engineers and other experts was formed earlier this week to identify the cause of this behavior and determine what solutions can be implemented from the ground to correct or compensate for it.

    If the team is successful in solving the problem, Hubble will return to normal, three-gyro operations. If it is not, the spacecraft will be configured for one-gyro operations, which will still provide excellent science well into the 2020s, enabling it to work alongside the James Webb Space Telescope and continue groundbreaking science.

    https://www.nasa.gov/feature/goddard/2018/update-on-the-hubble-space-telescope-safe-mode

     

  16. Three cheers for the crew, three cheers for Soyuz bringing them home safely and three cheers for @kerbiloid for letting us know about the safe landing minutes before NASA. 

    Note to self: don't invite your kids to watched manned launches anymore.

    A question:  What is the furry object, seen hanging by a string, above Aleksey Ovchinin during the launch?  Is it some kind of inertial indicator or the Russian version of furry dice on the rear vision mirror of a hotrod?

  17. I do remember reading that one of the astronomers at Parkes used to drive around the area with radio detecting equipment to try and pin down the interference before they traced it to the microwave.  Fortunately the ASKAP is located in a remote area and the federal and state governments legislated the area (12,600 hectares) to be a "radio quiet zone". 

    P1070164_thumb.jpg

    https://www.ska.gov.au/Observatory/Pages/RadioQuiet.aspx

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