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Old 08-08-2014, 11:14 AM
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DaveGee (Dave Gault)
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20140810 426-Hippo occults HIP 90639

On Saturday evening/ Sunday morning the asteroid 426-Hippo will occult a mag. 7 star in Sagittarius.

Predicted time for the east coast - 14:13:55 UT = 12:13:55 am on Sunday 10th. The time uncertainty is +/- 5 seconds, but you should observe +/- 1 minute.

Here is the latest prediction...
http://www.asteroidoccultation.com/2..._426_32844.htm

Rob Horvat, el Presidente - WSAAG writes:

Occultation of HIP 90639 by 426-Hippo
At right is a colour-inverted screen clip from SkySafari of Scorpius and Sagittarius for Sunday 10
th August 12:13:55am. Kaus Australis (epsilon Sagittarii) is about 52 degrees altitude.

For the star-hopper, the simple map below shows how to get to HIP 90639. The magnitudes are shown next to each star. Depending on your skies, most of the stars shown on the map should be visible in an 8x50 finderscope or 10x50 binoculars. At less than three degrees, the whole field is easily visible in a finderscope.
A magnitude 7 star near Kaus Australis can be used as a directional reference. The magnitude 7 star HIP 90639 and another magnitude 7 star are both about 1.2 degrees from Kaus Australis. In shorter focal length telescopes, it is possible to see Kaus Australis and HIP 90639 in the same field of view using a lowpower eyepiece.
While waiting, you might like to look at a couple of globular clusters in the area (M69 and NGC 6652). You won’t see them in 10x50 binoculars. They are best seen with a telescope of aperture 6” or larger.
Rob Horvat

Observation reports are welcome. Just post them here...I need to know,
Observer Name;
Site coordinates; Longitude, Latitude, Altitude and site name
Telescope Details; Type, Aperture
Time Reference; NTP, GPS, VTI, Micky Mouse Watch
Observation Times; Start, Disappearance, reappearance and End
If visual Observation; your reaction time estimate (PE) and if you have or have not subtracted PE from your event times.
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  #2  
Old 08-08-2014, 12:24 PM
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AstralTraveller (David)
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Dave, good to hear from you again and thanks for the heads up. Now I know where that cloud is coming from . The path goes straight over me so the travel distance is nil. The weather forecast is just so so. Too cloudy to be optimistic but too clear to write off. So you've just changed my plans for Saturday.

I can use a 'beeper box' but it will only be synced to a GPS by eye/ear. At least the duration will be passably accurate. [Of course near the edge of the path even presence/absence is a result.] There are plenty of astronomers under or near the path so lets hope quite a few jump on board!
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Old 10-08-2014, 12:03 AM
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DaveGee (Dave Gault)
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11.07 second occultation recorded

I observed an 11.07 second +/- 0.04 second event, through thin cloud.

Light curve below.
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Old 10-08-2014, 12:04 AM
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Nice. Thick cloud here.
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Old 10-08-2014, 12:54 AM
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Sadly, in Toongabbie both 426-Hippo and HIP 90639 were occulted by diffuse cloud. Thin enough to show Kaus Australis, but thick enough to obscure the mag 7 stuff...

Cheers
Steffen.
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Old 10-08-2014, 01:25 AM
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MrB (Simon)
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Quote:
Originally Posted by DaveGee View Post
I observed an 11.07 second +/- 0.04 second event, through thin cloud.

Light curve below.
Nice work Dave!
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Old 10-08-2014, 03:20 PM
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Top result Dave!

The Linden Observatory team also experienced cloud. We had the star HIP 90639 visible in the EP through thin cloud up till 12:12am. It then disappeared for a couple of minutes to reappear at 12:15am. Unfortunately, this disappearance was during the occultation time and due to thick cloud cover.

I mean - really!

Regards, Rob
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Old 10-08-2014, 06:46 PM
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AstralTraveller (David)
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Strewth a brick man! That is so cruel. That should be in the 'pain' thread that is running here. Have you been near black cats or under ladders?
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Old 10-08-2014, 09:38 PM
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Blue Skies (Jacquie)
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The North American observers have a term for that - You've been Nasoned! One of the currently active observers, Guy Nason, in Canada, has it happen to him so regularly he even applies the term to himself. Yet he soldiers on, brave chap.

I've had something similar happen to me last December - the target star just passed behind the very tippy-top of a tree, right at expected even time, and came back into the clear after it was all over. I wasn't too impressed either, that time. Good thing I've been doing astronomy for a quite a while and I'm used to Murphy's sense of humour.
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Old 19-08-2014, 03:54 PM
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DaveGee (Dave Gault)
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Quote:
Originally Posted by Blue Skies View Post
You've been Nasoned!
Yes, I pity bro. Nason.

Of course it's all the doings of the Patron-Saint of Occultation Observers, A.K.A. Bozo the Clown.
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