Info: Asteroid 2005 YU55 am 8.11 zu sehen

Ciao Holger + all,

ja prima ! - hier weitere Infos:
http://de.wikipedia.org/wiki/2005_YU55
http://ssd.jpl.nasa.gov/horizo…dy_group=sb&sstr=2005YU55

Er ist allerdings bei uns erst <font color="orange">nach</font id="orange"> der engsten Passage (8.11.) sichtbar, scheint es...
<font color="orange">Das beste Boebachtungsfenster liegt am frühen Abend des kommenden Mi 9.11. !</font id="orange">
Ich habe mal eine JPL-Horizon Ephemeride gerechnet für Heidelberg
(( 8°42'22.0''E, 49°25'33.0''N, h=100m)
(man muss (!) genau für den geografischen Ort rechnen, weil die Position bei einem so nahen Objekt von der Parallaxe stark beeinflusst wird !):
Die Helligkeit liegt am 9.11. bei etwa <font color="orange">12mag</font id="orange">. Geschwindigkeit am Himmel knapp unter <font color="orange">1°/Stunde</font id="orange"> am frühen Abend.

Weiteres zu dem Thema im allgemeinen z.B. hier... [:)]
http://eyes4skies.de/Internet/…HEHO.htm#intro_asteroiden
und ein ähnlicher Fall hier:
http://www.astrotreff.de/topic…HIVE=true&TOPIC_ID=107698

Ciao, Peter

***

*******************************************************************************
Date__(UT)__HR:MN R.A.__(a-apparent)__DEC dRA*cosD d(DEC)/dt a-mass
************************************************************************
2011-Nov-09 15:00 *m 01 03 52.51 +18 56 02.0 4763.197 -141.430 4.735 11.85 6.52
2011-Nov-09 16:00 Cm 01 09 08.69 +18 53 30.8 4223.585 -160.275 2.818 11.93 6.49
2011-Nov-09 17:00 Nm 01 13 49.50 +18 50 42.5 3759.752 -175.904 2.019 12.00 6.46
2011-Nov-09 18:00 m 01 17 59.95 +18 47 39.7 3362.245 -189.531 1.605 12.08 6.43
2011-Nov-09 19:00 m 01 21 44.43 +18 44 24.0 3023.143 -201.685 1.371 12.16 6.41
2011-Nov-09 20:00 m 01 25 06.81 +18 40 56.8 2735.564 -212.435 1.239 12.23 6.39
2011-Nov-09 21:00 m 01 28 10.52 +18 37 19.7 2493.300 -221.570 1.175 12.30 6.37
2011-Nov-09 22:00 m 01 30 58.55 +18 33 34.4 2290.570 -228.738 1.167 12.38 6.36
2011-Nov-09 23:00 m 01 33 33.49 +18 29 43.0 2121.875 -233.552 1.213 12.45 6.34
2011-Nov-10 00:00 m 01 35 57.54 +18 25 48.2 1981.926 -235.674 1.324 12.51 6.33
2011-Nov-10 01:00 m 01 38 12.58 +18 21 52.7 1865.651 -234.870 1.530 12.58 6.31
2011-Nov-10 02:00 m 01 40 20.08 +18 17 59.5 1768.227 -231.044 1.904 12.65 6.30
2011-Nov-10 03:00 m 01 42 21.23 +18 14 11.6 1685.155 -224.255 2.639 12.71 6.29
2011-Nov-10 04:00 m 01 44 16.88 +18 10 31.9 1612.337 -214.716 4.445 12.77 6.28

Column meaning:

TIME

Prior to 1962, times are UT1. Dates thereafter are UTC. Any 'b' symbol in
the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D.
date. Calendar dates prior to 1582-Oct-15 are in the Julian calendar system.
Later calendar dates are in the Gregorian system.

The uniform Coordinate Time scale is used internally. Conversion between
CT and the selected non-uniform UT output scale has not been determined for
UTC times after the next July or January 1st. The last known leap-second
is used over any future interval.

NOTE: "n.a." in output means quantity "not available" at the print-time.

SOLAR PRESENCE (OBSERVING SITE)
Time tag is followed by a blank, then a solar-presence symbol:

'*' Daylight (refracted solar upper-limb on or above apparent horizon)
'C' Civil twilight/dawn
'N' Nautical twilight/dawn
'A' Astronomical twilight/dawn
' ' Night OR geocentric ephemeris

LUNAR PRESENCE (OBSERVING SITE)
The solar-presence symbol is immediately followed by a lunar-presence symbol:

'm' Refracted upper-limb of Moon on or above apparent horizon
' ' Refracted upper-limb of Moon below apparent horizon OR geocentric
ephemeris

R.A._(a-apparent)__DEC. =
Airless apparent right ascension and declination of the target center with
respect to the Earth true-equator and the meridian containing the Earth true
equinox of date. Corrected for light-time, gravitational deflection of light,
stellar aberration, precession & nutation.
Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f)

dRA*cosD d(DEC)/dt =
The rate of change of target center apparent RA and DEC (airless).
d(RA)/dt is multiplied by the cosine of the declination.
Units: ARCSECONDS PER HOUR

a-mass =
RELATIVE optical airmass; a measure of extinction. The ratio between
the absolute optical airmass at the target's refracted CENTER-POINT to the
absolute optical airmass at zenith. Based on work of Kasten and Young
(Applied Optics, vol. 28 no. 22, 15-Nov-1989). AVAILABLE ONLY FOR
TOPOCENTRIC SITES WITH THE TARGET ABOVE THE HORIZON. Unitless.

Computations by ...
Solar System Dynamics Group, Horizons On-Line Ephemeris System
4800 Oak Grove Drive, Jet Propulsion Laboratory
Pasadena, CA 91109 USA
Information: http://ssd.jpl.nasa.gov/
Connect : telnet://ssd.jpl.nasa.gov:6775 (via browser)
telnet ssd.jpl.nasa.gov 6775 (via command-line)
Author : Jon.Giorgini(==&gt;)jpl.nasa.gov