[AZ-Observing] Re: Antennas on Saturday night ( the Quote Police Strike again)
- From: "Rick Tejera" <saguaroastro@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Mon, 15 Feb 2010 17:25:29 -0700
Tim,
My first guess was you had geocentric coordinates vs. topocentric. I ran an
ephemeris from my house (59th Ave & Loop 101) returning both geo &
topocentric coords (J2000) and the difference was not as great as you
noted. I then ran a new set using the Epoch of Date and in deed the
difference is more in line with what you're seeing.
The Empheides are below, though they may get jumbled in translation. If you
want, I can forward them to you off list. They were generated in SkyMap Pro
v11.
Also the time was set for 2030 local.
Ephemeris of Vesta J2000
Date Mag Top R.A. Top Dec Geo R.A. Geo Dec Azimuth
Altitude Rise Transit Set
15-Feb-10 6.1 10h 20m 32.9s +19° 30' 43" 10h 20m 32.5s +19°
30' 46" 084° 12' 01" +27° 51' 29" 18:08:49 1:09:40 8:05:28
16-Feb-10 6.1 10h 19m 35.3s +19° 38' 57" 10h 19m 34.9s +19°
39' 00" 084° 41' 21" +28° 56' 14" 18:03:30 1:04:47 8:01:01
17-Feb-10 6.1 10h 18m 37.2s +19° 47' 05" 10h 18m 36.9s +19°
47' 08" 085° 10' 54" +30° 01' 04" 17:58:11 0:59:54 7:56:33
18-Feb-10 6.1 10h 17m 38.9s +19° 55' 07" 10h 17m 38.5s +19°
55' 10" 085° 40' 39" +31° 05' 57" 17:52:52 0:55:00 7:52:04
19-Feb-10 6.1 10h 16m 40.2s +20° 03' 03" 10h 16m 39.9s +20°
03' 05" 086° 10' 39" +32° 10' 51" 17:47:33 0:50:06 7:47:35
20-Feb-10 6.1 10h 15m 41.4s +20° 10' 51" 10h 15m 41.1s +20°
10' 53" 086° 40' 56" +33° 15' 45" 17:42:15 0:45:12 7:43:05
21-Feb-10 6.1 10h 14m 42.5s +20° 18' 31" 10h 14m 42.2s +20°
18' 33" 087° 11' 30" +34° 20' 38" 17:36:56 0:40:18 7:38:35
22-Feb-10 6.2 10h 13m 43.6s +20° 26' 02" 10h 13m 43.3s +20°
26' 05" 087° 42' 25" +35° 25' 28" 17:31:38 0:35:24 7:34:05
23-Feb-10 6.2 10h 12m 44.8s +20° 33' 25" 10h 12m 44.4s +20°
33' 27" 088° 13' 40" +36° 30' 13" 17:26:21 0:30:29 7:29:34
24-Feb-10 6.2 10h 11m 46.1s +20° 40' 38" 10h 11m 45.8s +20°
40' 40" 088° 45' 20" +37° 34' 53" 17:21:04 0:25:35 7:25:02
Ephemeris of Vesta Epoch of date
Date Mag Top R.A. Top Dec Geo R.A. Geo Dec Azimuth
Altitude Rise Transit Set
15-Feb-10 6.1 10h 21m 06.0s +19° 27' 39" 10h 21m 05.7s +19°
27' 41" 084° 12' 01" +27° 51' 29" 18:08:49 1:09:40 8:05:28
16-Feb-10 6.1 10h 20m 08.5s +19° 35' 53" 10h 20m 08.1s +19°
35' 56" 084° 41' 21" +28° 56' 14" 18:03:30 1:04:47 8:01:01
17-Feb-10 6.1 10h 19m 10.5s +19° 44' 02" 10h 19m 10.1s +19°
44' 04" 085° 10' 54" +30° 01' 04" 17:58:11 0:59:54 7:56:33
18-Feb-10 6.1 10h 18m 12.1s +19° 52' 04" 10h 18m 11.8s +19°
52' 07" 085° 40' 39" +31° 05' 57" 17:52:52 0:55:00 7:52:04
19-Feb-10 6.1 10h 17m 13.5s +20° 00' 00" 10h 17m 13.2s +20°
00' 02" 086° 10' 39" +32° 10' 51" 17:47:33 0:50:06 7:47:35
20-Feb-10 6.1 10h 16m 14.8s +20° 07' 48" 10h 16m 14.4s +20°
07' 50" 086° 40' 56" +33° 15' 45" 17:42:15 0:45:12 7:43:05
21-Feb-10 6.1 10h 15m 15.9s +20° 15' 28" 10h 15m 15.6s +20°
15' 31" 087° 11' 30" +34° 20' 38" 17:36:56 0:40:18 7:38:35
22-Feb-10 6.2 10h 14m 17.0s +20° 23' 00" 10h 14m 16.7s +20°
23' 03" 087° 42' 25" +35° 25' 28" 17:31:38 0:35:24 7:34:05
23-Feb-10 6.2 10h 13m 18.3s +20° 30' 23" 10h 13m 17.9s +20°
30' 25" 088° 13' 40" +36° 30' 13" 17:26:21 0:30:29 7:29:34
24-Feb-10 6.2 10h 12m 19.6s +20° 37' 37" 10h 12m 19.3s +20°
37' 39" 088° 45' 20" +37° 34' 53" 17:21:04 0:25:35 7:25:02
I may give this a try tonight.
Rick Tejera
Editor SACnews
Saguaro Astronomy Club
Phoenix, Arizona
saguaroastro@xxxxxxx
www.saguaroastro.org
K7TEJ
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Jones
Sent: Monday, February 15, 2010 15:13
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: Antennas on Saturday night
Hi Wayne,
Actually, I think it was the ephemeris data that I had. 90mm and 5.9 Mag
should have been quite compatible. However, based on the models at
Astronomy.com, Vesta should have been further East compared to what I was
seeing (Algieba and LM 40 were centered in the eyepiece), so that combined
with the fact that other objects were coming up dead center is why I suspect
the ephemeris data.
You "should" be able to spot it as it's at Mag 6 or so. a couple of views
at 2 hour intervals should show enough relative motion to identify Vesta.
Here's what is reported for tonight at 20:30 and 21:00 according to
Astronomy.com's Stardome Plus:
Time Right Asc Declination Azimuth Altitude
Magn.
20:30 Vesta 10h20m20s 19°30'37" 88°05'01" 34°20'33" 5.9
21:00 Vesta 10h20m21s 19°30'27" 84°11'26" 28°04'40" 5.9
And, these are almost 1' 30" in both RA and Dec different than the same
times as provided by JPL's ephemeris generator. Granted, I'm using a
generic "Phoenix, Az" instead of a more precise Lat/Long, but 1' 30" for the
same location??? Does anyone else have tonight's info to compare? We
suspect that this is a difference caused by J2000 versus JNow values.
Anyone else?
Tim
--
See message header for info on list archives or unsubscribing, and please
send personal replies to the author, not the list.
Other related posts:
- » [AZ-Observing] Re: Antennas on Saturday night ( the Quote Police Strike again) - Rick Tejera
