[kuuplan-l] kaksi pyrstötähteä

Arto.Oksanen at tietoenator.com Arto.Oksanen at tietoenator.com
Ma Elo 5 12:00:37 EEST 2002


Syyskausi alkaa mukavasti kahdella havaittavissa olevalla pyrstötähdellä.
Himmeämpi, mutta paremmin taivaalle sijoittuva on C/2002 O4 (Hoening) ja
toinen juuri löydetty ja kirkkaampi C/2002 O6. Ohessa lisätietoa
komeetoista.

Uusia koordinaatteja ja rataelementtejä osoitteesta:
http://cfa-www.harvard.edu/iau/Ephemerides/Comets/index.html

arto

--
Arto Oksanen
puheenjohtaja
Jyväskylän Sirius ry

puh: 040-5659438, fax: 014-4157803, sähköposti: arto.oksanen at jklsirius.fi
Jyväskylän Sirius ry, Kyllikinkatu 1, 40100 Jyväskylä

-----Original Message-----
From: Arto.Oksanen at tietoenator.com [mailto:Arto.Oksanen at tietoenator.com]

Sent: 5. elokuuta 2002 10:44
To: sirius-l at ursa.fi
Subject: sirius-l: toinenkin pyrstötähti


Uusi pyrstötähti C/2002 O6 (löytäjä on vielä hieman kiistanalainen) on
ilmestynyt taivaalle. Se on näkyvissä Suomesta, vaikkakin matalalla
vaalealla pohjoistaivaalla. Parhaiten se näkyy elokuun puolivälin jälkeen
noin kello yhden tietämissä tai vähän sen jälkeen. Se on silloin
kirkkaimmillaan noin 6.5 magnitudin kirkkauksinen ja löytyy Kaksosista tai
Ison karhun alaosasta. 

Lisätietoa oheisesta Sky&Telescopen tiedotteesta.

-----Original Message-----
From: Roger W. Sinnott [mailto:rsinnott at SkyandTelescope.com] 
Sent: 5. elokuuta 2002 0:14
To: comet at SkyandTelescope.com
Subject: AstroAlert: New Dawn Comet


==================================================================
This Is SKY & TELESCOPE's AstroAlert for Comets
==================================================================


            NEW COMET IN THE DAWN SKY

Another new comet, even brighter than Comet Hoenig
(announced last week), can now be seen by observers with
large binoculars in the Northern Hemisphere. It is low in
the eastern sky around the time morning twilight begins.

According to calculations by Brian G. Marsden, published
by the Central Bureau for Astronomical Telegrams on IAU
Circular 7948 (August 3rd), this comet will pass through
perihelion around September 9th. It will then be midway
between the Earth's orbit and the Sun. This comet is
traveling in a near-parabolic orbit inclined 59 degrees
to the ecliptic. Further details about the discovery are
available from the Central Bureau's subscription service
(visit http://cfa-www.harvard.edu/iau/cbat.html ).

Unfortunately, as this comet gets closer to perihelion
its elongation angle from the Sun decreases, making it
harder to observe. On August 8th, for example, at the
start of morning twilight, the comet is 16 degrees
above the eastern horizon for an observer at latitude
40 degrees north. By the 21st it is only 10 degrees
above the northeastern horizon as twilight begins.
The second and third weeks of August appear to offer the
best viewing prospects for this object, which is not
likely to become brighter than 6th magnitude.

While it carries the designation C/2002 O6, this comet's
name has not yet been officially announced. Japanese
astronomer Masayuki Suzuki was among the first to spot
it on all-sky images taken in late July with the SOHO
spacecraft's SWAN solar-wind camera. Unlike the many
other SOHO comets, this one was detected 90 degrees from
the Sun and is not a Sun-grazer at all. As reported on
IAU Circular 7944 (August 1st), Alan Hale in Cloudcroft,
New Mexico, confirmed it visually with an 8-inch (20-cm)
telescope and J. Broughton in Queensland, Australia,
obtained CCD images with a 10-inch reflector.

The following ephemeris, based on Marsden's preliminary
orbital elements, gives the comet's right ascension and
declination (equinox 2000.0) at 0h Universal Time on each
date, its distance from the Earth (delta) and Sun (r) in
astronomical units (where 1 a.u. is 149,600,000 km),
elongation angle, predicted magnitude, and the
constellation through which it is passing.


Roger W. Sinnott
Senior Editor
Sky & Telescope


----------------------------------------------------------

                       COMET 2002 O6

Date       R.A.    Dec.    delta    r   Elong. Mag. Const.
(0h UT)    h  m     o  '    a.u.   a.u.    o            
Aug 05    4 39.3  -03 09   0.279  0.942   67   7.0   Eri
Aug 06    4 54.4  +00 33   0.270  0.925   63   6.8   Ori
Aug 07    5 10.5  +04 30   0.263  0.908   59   6.7   Ori
Aug 08    5 27.6  +08 35   0.259  0.891   55   6.6   Ori
Aug 09    5 45.5  +12 42   0.258  0.873   51   6.5   Tau
Aug 10    6 04.1  +16 45   0.259  0.856   47   6.4   Ori
Aug 11    6 23.2  +20 36   0.264  0.839   43   6.3   Gem
Aug 12    6 42.5  +24 10   0.271  0.822   39   6.3   Gem
Aug 13    7 01.7  +27 22   0.281  0.805   37   6.3   Gem
Aug 14    7 20.7  +30 10   0.293  0.789   34   6.3   Gem
Aug 15    7 39.1  +32 33   0.307  0.772   33   6.3   Gem
Aug 16    7 56.7  +34 32   0.323  0.755   31   6.3   Lyn
Aug 17    8 13.4  +36 10   0.341  0.739   30   6.4   Lyn
Aug 18    8 29.1  +37 28   0.361  0.723   30   6.4   Lyn
Aug 19    8 43.7  +38 30   0.381  0.707   30   6.4   Lyn
Aug 20    8 57.2  +39 17   0.403  0.691   30   6.4   Lyn
Aug 21    9 09.7  +39 52   0.426  0.676   30   6.4   Lyn
Aug 22    9 21.1  +40 16   0.450  0.661   30   6.5   Lyn
Aug 23    9 31.6  +40 32   0.474  0.646   30   6.5   Lyn
Aug 24    9 41.1  +40 41   0.499  0.631   30   6.5   Lyn
Aug 25    9 49.8  +40 44   0.525  0.617   30   6.5   LMi
Aug 26    9 57.7  +40 40   0.552  0.604   30   6.5   LMi
Aug 27   10 04.9  +40 33   0.579  0.591   31   6.5   LMi
Aug 28   10 11.5  +40 21   0.606  0.578   31   6.5   LMi
Aug 29   10 17.5  +40 06   0.634  0.566   31   6.5   UMa
Aug 30   10 23.0  +39 47   0.662  0.555   31   6.5   UMa
Aug 31   10 28.0  +39 25   0.691  0.545   31   6.6   UMa
Sep 01   10 32.6  +39 01   0.720  0.535   31   6.6   LMi
--------------------------------------------------------


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-----Original Message-----
From: Arto.Oksanen at tietoenator.com [mailto:Arto.Oksanen at tietoenator.com]
Sent: 1. elokuuta 2002 13:30
To: sirius-l at ursa.fi
Subject: sirius-l: Komeetta C/2002 O4 (HOENIG)

Varsin mukava saksalaisen tähtiharrastajan löytämä komeetta on 
näkyvissä alkusyksyn taivaalla.

-------------------------------------------------------------------
THE ASTRONOMER Electronic Circular No 1790      2002 Jly 31 14.02UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY at TAHQ.DEMON.CO.UK             GMH at AST.STAR.RL.AC.UK
WORLD WIDE WEB                         http://www.theastronomer.org
-------------------------------------------------------------------
COMET C/2002 O4 (HOENIG)
The comet reported on E-Circular 1789 has now been named as above. The
discovery was made visually by S. Hoenig (Dossenheim, Germany) with
0.25-m f/6.3 Schmidt-Cassegrain. Coma dia 2'. 

Orbital elements:
T  2002 Oct   1.9900 TT      w 105.77300 )
e  1.00000000                O 321.01400 ) 2000.0
q  0.7784900 A.U.            i  73.06700 )
Source: MPEC 2002-045    Positions are geocentric
m =  9.5 + 5.0 log R + 10.0 log r
  Date    R.A. (2000) Dec.     R       r     Elong  Mag.    Motion
          h  m       o  '     (AU)    (AU)     o          "/hr P.A.
2002 Aug 
   1.00  23 12.51  +49  8.4   0.699   1.374  105.1  10.1   318  347
   2.00  23  9.38  +51 13.5   0.690   1.361  104.3  10.0   325  346
   3.00  23  5.80  +53 20.8   0.681   1.347  103.4  10.0   332  345
   4.00  23  1.70  +55 29.9   0.674   1.333  102.4   9.9   338  344
   5.00  22 56.98  +57 40.5   0.667   1.320  101.4   9.8   343  343
   6.00  22 51.50  +59 51.8   0.662   1.306  100.2   9.8   347  341
   7.00  22 45.11  +62  3.5   0.658   1.293   99.0   9.7   350  340
   8.00  22 37.58  +64 14.6   0.654   1.279   97.8   9.6   352  338
   9.00  22 28.65  +66 24.5   0.652   1.266   96.5   9.6   354  336
  10.00  22 17.94  +68 32.1   0.651   1.252   95.1   9.5   354  333
  11.00  22  4.97  +70 36.1   0.650   1.239   93.7   9.5   353  330
  12.00  21 49.08  +72 35.2   0.651   1.226   92.2   9.5   350  326
  13.00  21 29.44  +74 27.4   0.653   1.212   90.7   9.4   347  321
  14.00  21  5.01  +76 10.0   0.655   1.199   89.2   9.4   343  315
  15.00  20 34.65  +77 39.8   0.659   1.186   87.7   9.3   338  308
  16.00  19 57.48  +78 52.5   0.664   1.173   86.2   9.3   332  299
  17.00  19 13.64  +79 43.4   0.669   1.160   84.6   9.3   326  288
  18.00  18 25.14  +80  8.4   0.675   1.147   83.1   9.2   320  276
  19.00  17 35.92  +80  6.0   0.682   1.134   81.6   9.2   313  263
  20.00  16 50.23  +79 38.4   0.690   1.122   80.0   9.2   306  252
  21.00  16 10.77  +78 50.4   0.698   1.109   78.5   9.2   298  242

Joni Pegram
--------------------------------------------------------
Tämä viesti on lähetetty Jyväskylän Siriuksen postilistalle
Jyväskylän Sirius ry http://www.ursa.fi/sirius mailto:sirius at ursa.fi



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