NASA’s Cassini Spacecraft Is Set To Make Its First Dive Through The Narrow Gap Between Saturn And Its

NASA’s Cassini Spacecraft Is Set To Make Its First Dive Through The Narrow Gap Between Saturn And Its

NASA’s Cassini spacecraft is set to make its first dive through the narrow gap between Saturn and its rings on April 26, 2017. Because that gap is a region no spacecraft has ever explored, Cassini will use its dish-shaped high-gain antenna (13 feet or 4 meters across) as a protective shield while passing through the ring plane. No particles larger than smoke particles are expected, but the precautionary measure is being taken on the first dive. The Cassini team will use data collected by one of the spacecraft’s science instruments (the Radio and Plasma Wave Subsystem, or RPWS) to ascertain the size and density of ring particles in the gap in advance of future dives. As a result of its antenna-forward orientation, the spacecraft will be out of contact with Earth during the dive.

Below is a list of milestones expected to occur during the event, if all goes as planned:

– 5 p.m. PDT (8 p.m. EDT) on April 25: Cassini is approaching Saturn over the planet’s northern hemisphere in advance of its first of 22 planned dives through the gap between the planet and its rings.

– 1:34 a.m. PDT (4:34 a.m. EDT) on April 26: As it passes from north to south over Saturn, Cassini begins a 14-minute turn to point its high-gain antenna into the direction of oncoming ring particles. In this orientation, the antenna acts as a protective shield for Cassini’s instruments and engineering systems.

– 2 a.m. PDT (5 a.m. EDT) on April 26: Cassini crosses the ring plane during its dive between the rings and Saturn. The spacecraft’s science instruments are collecting data, but Cassini is not in contact with Earth at this time.

– No earlier than around midnight PDT on April 26 (3 a.m. EDT on April 27): Earth has its first opportunity to regain contact with Cassini as the giant, 230-foot (70-meter) Deep Space Network antenna at Goldstone, California, listens for the spacecraft’s radio signal.

More Posts from Astrotidbits-blog and Others

8 years ago
Hubble Has Been 27 Years In Space, Being Launched In April 24, 1990. The First Image It Shoot Was The
Hubble Has Been 27 Years In Space, Being Launched In April 24, 1990. The First Image It Shoot Was The

Hubble has been 27 years in space, being launched in April 24, 1990. The first image it shoot was the star cluster NGC 3532.

7 years ago
World Ham Radio Prefix Map

World ham radio prefix map

7 years ago
Still A Little Bit Of Their Beauty Is Captured In The Man Made Technology

still a little bit of their beauty is captured in the man made technology

8 years ago
The Great Comet Of 1881  -   Étienne Léopold Trouvelot  1881

The Great Comet of 1881  -   Étienne Léopold Trouvelot  1881

French 1827-1895

Vintage illustration, Comet over observatory in night time sky

8 years ago
November 3 1957, The Soviet Union Launches The First Animal Into Space—a Dog Name Laika—aboard The

November 3 1957, The Soviet Union launches the first animal into space—a dog name Laika—aboard the Sputnik 2 spacecraft. Laika, lived as a stray on the Moscow streets before being enlisted into the Soviet space program. Laika survived for several days as a passenger in the USSR’s second artificial Earth satellite, kept alive by a sophisticated life-support system. Electrodes attached to her body provided scientists on the ground with important information about the biological effects of space travel. She died after the batteries of her life-support system ran down.

8 years ago
Comet Lander Philae Wakes Up: How It Happened And What’s Next
Comet Lander Philae Wakes Up: How It Happened And What’s Next

Comet lander Philae wakes up: How it happened and what’s next

By Lauren Raab

Philae, the first spacecraft to land on a comet, surprised and delighted scientists this weekend by waking up and reestablishing contact with Earth, seven months after running out of power. It “spoke” for more than a minute, according to the European Space Agency, and it’s expected to be able to continue gathering information and sending it home.

Here’s a look at what the lander has done so far and what will happen next.

Continue Reading.

8 years ago
Resembling Our Moon, And With A Similar Atmosphere, Mercury Has Enough Activity In Its Interior To Generate

Resembling our Moon, and with a similar atmosphere, Mercury has enough activity in its interior to generate a small magnetic field. Join guides Denton Ebel and Carter Emmart for an up-close examination of our solar system’s smallest planet. 

8 years ago
Inside - Vadim Sadovski
Inside - Vadim Sadovski
Inside - Vadim Sadovski
Inside - Vadim Sadovski
Inside - Vadim Sadovski
Inside - Vadim Sadovski
Inside - Vadim Sadovski
Inside - Vadim Sadovski

Inside - Vadim Sadovski

7 years ago

Catching Up: Weather is weird... TWWN continues... 80 Meter woes...

-=> Weather is just plain odd around here. We’re supposed to get up to 7 inches of snow, but nothing so far. Here in town it’s actually pretty nice

Out in the country it’s a different story. Not snowing, but 30+ MPH winds are whipping the snow we do have into near blizzard like conditions in some areas. Went down to Stockbridge to my favorite coffee shop, Mud Creek, and if I hadn’t been driving the Jeep I don’t think I would have made it. Was bucking drifts a foot or more deep in some areas, and visibility was down to just a few feet in places.

Problem with the Jeep is I get overconfident. I was bashing along around 40 mph in four wheel drive, and nearly lost it when I nailed a 2 foot deep drift. Wouldn’t have been a problem if I’d been driving slow, but at 40 the front end wiped out and I nearly went sideways before I got it straightened out again. Needless to say, I slowed down a bit after that.

So, snow storms today, and by Thursday it’s supposed to be 40 degrees and raining.

Sigh…

Noticed they got the street dug up just down the road from the house here. Another water main break. Must be the fifth one we’ve had in town in the last two months. Feel sorry for the water utility guys. And I stocked up on bottled water just in case…

-=> Work on The World’s Worst Novel continues unabated. I’ve been having way too much fun with this thing. It’s an SF novel in the worst sense of the word, harking back to the old space opera days with ridiculous space battles, paying very little attention to whether or not the ‘science’ bears any relationship to actual physics. It’s also gotten very, very dirty. Well, not by modern standards. Compared to modern fiction it’s actually pretty mild, but for me… I keep wondering where this stuff comes from.

Curiously, I just realized that almost all of the main characters are female. The protagonist is female, her spouse is female, almost all the heads of government are female… Not sure why. Didn’t do it deliberately. 

-=> Amateur Radio stuff… I have, alas, been doing very little of late except listening. I’ve discovered that my Comet vertical antenna is total crap below about 20 meters or so, which is understandable when you look at how the thing is built. Most of the energy going into the thing, especially at lower frequencies, is never getting into the air. Frankly, it’s surprising I can get a decent SWR at all with the thing on the lower bands. I ran some generic calculations and if I got the formulas right (which I probably didn’t) if I put 200 watts into the thing down at 3.8 mHz I’m lucky if I get 20 out of it.

Weather has been so nasty I’ve never even tried to get the dipole up. For one thing, mounting it is going to be a problem. I’m going to have to put up some kind of mast to try to get the center of the thing up to around 35 feet, and then it’s going to have to be configured as an inverted V because there’s nothing I can hook the ends to.

I picked up a Gap Titan multi band vertical that I’m going to give a try. It’s far more efficient than the Comet and even better, I can finally use my big amplifier with it. It’s rated to handle 1,500 watts so I can finally fire up the Ameritron. If it works, that is. Considering Ameritron’s reputation, you never know what’s going to happen. I talked to a guy who used to sell the things and they’d go through every one before they sent it out because they were having a 25% failure rate straight form the factory. I looked it over carefully when I put it together and didn’t see any obvious issues, and it does come up in standby mode, but until I actually try using it, whether it’ll work or not is anyones guess.

From what I’ve been hearing, the Titan has some issues when it comes to tuning it to work on the various bands. One fellow I talked to told me he never could get the thing down to a reasonable SWR on 80 meters. Other people tell me they had no problems at all. So we’ll see. SWR doesn’t bother me that much. I’ve got a massive Palstar auto tuner that can handle up to 2,000 watts output to hang behind the Ameritron.

I really wish now that I’d spent a little bit more and gone for the solid state amplifier rather than the tube based one. The solid state amps are a lot easier to work with. They’re pretty much plug and play, just turn them on, select the band you want, and go. Tube amps are fussy, requiring a lot of fiddling whenever you change bands, even changing frequencies. It’s easy to mess them up and end up blowing a $300 tube. Still, it was almost a grand cheaper than the solid state amp I was looking at, so we’ll see.

  • anonymouslymysterious
    anonymouslymysterious liked this · 3 years ago
  • astrotidbits-blog
    astrotidbits-blog reblogged this · 8 years ago
  • astrotidbits-blog
    astrotidbits-blog liked this · 8 years ago
  • caviriot
    caviriot liked this · 8 years ago
  • waltzing-with-my-inner-geek
    waltzing-with-my-inner-geek liked this · 8 years ago
  • vulcanbynature
    vulcanbynature liked this · 8 years ago
  • quantumtardis
    quantumtardis reblogged this · 8 years ago
  • acrylicxstars
    acrylicxstars reblogged this · 8 years ago
  • etceterodactyl
    etceterodactyl reblogged this · 8 years ago
  • space-news
    space-news reblogged this · 8 years ago
astrotidbits-blog -  Astrotidbits.info
Astrotidbits.info

282 posts

Explore Tumblr Blog
Search Through Tumblr Tags