[Chaos-l] Harley 2 update

[Tony Rice]

Update on our (current) favorite comet.   calsky is calling it 6.6 at this
point.
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From: "CalSky.com Alerter" <alerter at calsky.com>
Date: Oct 5, 2010 11:12 AM
Subject: [CalSky] Todays Bright Comets (rtphokie)
To: <rtphokie at gmail.com>

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the top right-hand corner. *Start of used for calculation:*Date:5. October
2010 Time:13:11:41

*Duration for calculation:*1 Day

Comets visible from your site  *Tuesday 5 October 2010* TimeObject (Link)
Event <http://www.calsky.com/observer/vcal.php?pid=88676804777151&id=1>20.0h
[image:
Hartley 2]Hartley
2<http://www.calsky.com/csephem.cgi?object=Comet&number=103P&tdt=2455475.50136286&obs=54404012470422>
→Star chart<http://www.calsky.com/csrender.cgi?object=Comet&number=103P&tdt=2455475.50136286&obs=54404012470422>Comet
'103P'
*Magnitude= 6.6mag*
Best seen from 20.0h - 6.1h (hmax=69° at 2.0h) (in constellation Cassiopeia)

RA= 1h42m24s  Dec=+56°45.4' (J2000) Distance to Sun= 1.10AU  Distance to
Earth= 0.16AU  Elongation=127°
hourly motion: dRA=295.4"/h  dDec= 18.4"/h
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Glossary: *Comet*Interplanetary celestial body, usually consisting of ice
and rock. Due to heating up when approaching the sun, the ice starts
evaporating and produces a nebulous coma and tail around the nucleus. *
Magnitude/Mag*Brightness of an object considered as a point source of light,
on a logarithmic scale. Visual limiting magnitude is about 6mag, whereas the
brightest star Sirius reaches -1.4mag. The Hubble Space Telescope can image
objects as dim as 29mag. *Best seen between / hmax*The best visibility time
interval of the object. The calculation takes into account the magnitude of
the object (required elevation above horizon), and the elevation of the sun.
The time is given in local civil time (LCT), i.e. the time zone and
definitions as selected by you. hmax is the maximum altitude over the
horizon, that the object reaches during this time period. *RA, Dec*The
coordinates are astrometric coordinates for epoch and equinox of J2000 (or
the selected system). *Radius*Distance of the celestial body from main
central body (earth for the moon, the sun otherwise). For the moon the unit
is earth radii (ER), otherwise Astronomical Unit (AU), the mean distance
between the sun and earth. *Delta*Distance of the celestial body from earth
in Astronomical Units (AU). For the moon, Delta is the topocentric distance
of the moons mass center from the observer in earth radii (ER). It is also
the fourth letter in Greek alphabet *Elongation*The elongation is the
angular separation of the (ecliptical) longitudes of a celestial body and
the central body (Sun, for moons: Jupiter or Saturn), as seen from the earth
mass center. *dRA, dDec*Apparent angular movement of the object. The value
for right ascension is reduced to the movement at the celestial equator *User
Level*CalSky calculates thousands of events. In order to select the right
ones for you, it supports the concept of user levels.\ The four predefined
levels assume different degrees of interest and higher developed user skills
and technical equipment.\ CalSky implements this various interests by having
several predefined subsets from all covered topics. \ Within the topics, the
selection is based on the magnitude of the object, the time interval where
it stands high enough above the horizon, but the sun is low enough to enable
the spotting of an object with the magnitude. \ See the table of contents to
get an idea of the whole functionality.\
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