New Horizons Jupiter Encounter |
New Horizons Jupiter Encounter |
Guest_AlexBlackwell_* |
Jan 10 2007, 09:47 PM
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#201
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Feb 28 2007, 01:27 PM
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#202
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Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
Can someone tell me when NH will start slowing down again ? yoahua's webpage shows NH still accelerating.
Thanks. |
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Feb 28 2007, 07:05 PM
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#203
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Member Group: Members Posts: 153 Joined: 14-August 06 Member No.: 1041 |
Can someone tell me when NH will start slowing down again ? yoahua's webpage shows NH still accelerating. Thanks. Looking at earlier predictions ~ early January, it appears closest approach was sooner than expected - several hours, even if Emily's graph was in another time zone. I have wondered if Yoahua's numbers were calulated, or based upon actual Doppler. If they don't start down real soon, you can assume Yoahua's calculator is based upon an earlier trajectory. The peak velocity, relative to the sun, appears to be about 0.11km/s (0.4% absolute 2.9% delta) slower than earlier graphs suggest. |
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Mar 1 2007, 04:31 PM
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#204
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Junior Member Group: Members Posts: 86 Joined: 12-October 05 From: Beijing Member No.: 526 |
Looking at earlier predictions ~ early January, it appears closest approach was sooner than expected - several hours, even if Emily's graph was in another time zone. I have wondered if Yoahua's numbers were calulated, or based upon actual Doppler. If they don't start down real soon, you can assume Yoahua's calculator is based upon an earlier trajectory. The peak velocity, relative to the sun, appears to be about 0.11km/s (0.4% absolute 2.9% delta) slower than earlier graphs suggest. My calculator was based on server-side interpolated JPL Horizons data and client-side gravitational simulation, which uses ephemeris nh_ref_20060119_20150727_v02 (released 2006-Jun-13, predicted thereafter). The ephemeris has been updated three times (on Jan 21, Jan 24, Jun 13 2006 respectively) at Horizons. |
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