Talk:New Horizons

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Escape the Solar System?[edit]

The article is pretty clear on why NH will never overtake the Voyagers, but will NH escape the star system or will it end up orbiting the Sun? If an answer is known, I think it should be added to the article. 129.94.237.181 (talk) 02:03, 26 November 2014 (UTC)

Power[edit]

Is there any reference regarding the sentence «The RTG will provide about 250 W, 30 V DC at launch, and is predicted to drop approximately 5% every 4 years, decaying to 200 W by the encounter with the Plutonian system in 2015.»?
If the rate of output drop is correct, it appears to me the power in the middle of 2015 will be much higher than the 200W written here:

Year Power (W)
2006 250,0
2010 237,5
2014 225,6
2018 214,3
2022 203,6
2026 193,4
2030 183,8
2034 174,6
2038 165,9

Luca Mauri (talk) 11:06, 7 December 2014 (UTC)

I found a reference for the specs of the RTG over here [1]. On page 4 the authors state that New Horizons needs 237W at launch and 191W at Pluto flyby (minimum). On the bottom of page 3 the authors state that a typical RTG should provide at least 285W at the beginning of mission. On page 6 the authors state that the New Horizons RTG uses plutonium-238, which has a half-life of 87.7 years. In the next scentence they state that the drop in thermal power is only 0.8% per year which corresponds to what I get when I punch my calculation (p = 100 - (100 * (0.5^((1/87.7)*t))) for t = 1 >>> p = 0.787247) in WolframAlpha. That considered the table by Luca Mauri should look like below, considering that the drop in electrical power is the same as the drop in thermal power.

As for the voltage, on page 6 the authors mention a test voltage of 30V. I assume this also goes for the New Horizons probe, so that would be correct. The rest of the power section does not seem to contradict the paper.

Year Power (W)
2006 285
2010 276.131
2014 267.538
2018 259.212

However, this[2] paper (page 41) states a different start power, roughly 245 W and power levels at Pluto (195 ~ 200W), which is not consistent with the power drop 0.8% per year.

Jonathan Juursema (talk) 17:55, 24 January 2015 (UTC)

Hibernation savings[edit]

"been spent in hibernation mode to preserve onboard systems"

That´s nosense, isn´t it? There is nothing that would wear out on the probe. It´s to save money for operators and time on the deep space network. --Maxus96 (talk) 07:23, 2 January 2015 (UTC)

Not sure this is nonsense: while the probe do not experience "wear" in the more strict sense of the word (see Wear), electronics can benefit from not being turned on thw whole flight time to Pluto. This is also written in the referenced webpage http://pluto.jhuapl.edu/news_center/news/062807.php Luca Mauri (talk) 10:32, 6 January 2015 (UTC)

flight path[edit]

Has the flight path been finalized? Are we going optimal or safe? — kwami (talk) 20:46, 4 January 2015 (UTC)

  1. ^ http://www.fas.org/nuke/space/gphs.pdf
  2. ^ http://download.springer.com/static/pdf/651/bok%253A978-0-387-89518-5.pdf?auth66=1422122880_d356215b356e6a6ace7800a921692426&ext=.pdf