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This page was last modified on September 2, 1999 by Casper ter Kuile and Carl Johannink |
Perseids 1997: visual results
Carl Johannink, Public Observatory VST/EPS, Lattrop
VISUAL RESULTS 1997 Until know (August 13th) we could observe over 40 hours this summer. A new record, only 1983 was comparable. Nine clear nights between August 4th and August 12th are very rare in the Netherlands. Below are the results, maybe some more will follow in the next nights. But the moon is interfering more and more ... Observing with Rita Verhoef, Adrian Verhoef, Arnold Tukkers, Ralf Mulder and Frank Kooiman was very pleasant. We had a great time, and more observations are planned. Thanks also to Marc de Lignie who photographed during the maximum nights from the Public Observatory Lattrop. Carl Johannink ==================================================================== *Date : 27/28-07-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.=18h; Decl.=70 deg. at 21:00 UT gradually becoming R.A.=23h; Decl.=70 deg. at 02:00 UT *Start : 21:55 UT *End : 22:50 UT *Teff : 0.92 hours Time(UT): P.: A.: C.: kC: spo: N: LM: notes: 21:55-22:50 2 2 - - 4 8 6.2 0.92 hours; clouds after 22:50 ==================================================================== *Date : 28/29-07-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.=18h; Decl.=70 deg. at 21:00 UT gradually becoming R.A.=23h; Decl.=70 deg. at 02:00 UT *Start : 22:15 UT *End : 00:45 UT *Teff : 2.25 hours Period (UT) P A C kC spo N LM Remark 22:15-23:30 6 4 1 - 10 21 6.2 1.25 hours 23:45-00:45 5 3 1 - 8 17 6.2 Stream: <=-2 1 0 1 2 3 4 5 6 mean: N: Perseids 1.5 0.5 3 5.5 0.5 3.27 11 Aquarids 2.5 3 1.5 3.86 7 Capric. 0.5 1.5 2.75 2 sporads. 1 3 8.5 5.5 3.97 18="===================================================================" *Date : 29/30-07-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 22:00 UT *End : 00:45 UT *Teff : 2.40 hours Period (UT) P A C kC spo N LM Remark 22:00-23:09 5 5 3 10 23 5.9 1.15 hours 23:30-00:45 3 3 3 13 22 5.8 1.25 hours Nice activity from the Aqua's this night. Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 4 2 2 3.75 Aquarids 1.5 0.5 3.5 2.5 2.88 Capric. 1 2 1 1.5 0.5 2.75 sporads. 0.5 1.5 7 13 1 3.54="===================================================================" From 30/07 until 04/08 no observations. Mostly cloudy weather with only short periods of clear skies. But at last ... *Date : 04/05-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 21:05 UT *End : 02:05 UT *Teff : 5.00 hours Period (UT) P A C kC spo N LM Remark 21:05-22:05 10 4 1 18 33 6.3 LM="4.7" at 21:05; 6.0 at 21:30 22:05-23:05 11 3 21 35 6.3 23:05-00:05 14 2 3 7 26 6.3 00:05-01:05 14 5 3 13 35 6.3 01:05-02:05 9 4 2 1 10 26 6.1 LM="5.2" at 02:00 Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 2 3.5 3.5 5.5 6 18 13.5 5 1 2.52 Aquarids 0.5 1.5 1.5 6.5 4.5 3.5 3.31 Capric. 1 1 0.5 1 4 0.5 1 1.83 sporads. 3.5 17.5 29.5 16.5 2 3.94 Enjoyable night! One of the best nights in early August in the last years. See the summary of 'bright meteors'!="===================================================================" *Date : 05/06-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 21:10 UT *End : 02:10 UT *Teff : 5.00 hours Period (UT) P A(d,i) C kC spo N LM Remark 21:10-22:02 12 3,1 18 34 6.2 LM="4.7" at 21:10 6.0 at 21:30; 0.87 hours 22:02-23:02 15 5,1 1 10 32 6.2 23:02-00:02 10 3,1 2 13 29 6.2 00:02-01:02 11 4,- 3 1 13 32 6.2 01:02-02:10 16 3,1 15 35 6.1 LM="5.0" at 02:00; 1.13 hours Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 1 1 2.5 1 9 19 18 10.5 2 3.27 Aquarids 1 0.5 1 5 10 4 0.5 3.66 d Aquar. 1 0.5 4.5 8.5 3 0.5 3.69 i Aquar. 0.5 0.5 0.5 1.5 1 3.50 Capric. 1 1 1 1.5 1.5 2.25 k. Cygnids 0.5 0.5 .... sporads. 2 3 11 32 17 4 4.03="===================================================================" *Date : 06/07-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 21:02 UT *End : 02:09 UT *Teff : 5.12 hours Period (UT) P A(d,i) C kC spo N LM Remark 21:02-22:02 8 2,3 2 16 31 6.3 LM="4.7" at 21:10 6.0 at 21:30 22:02-23:02 8 4,2 22 36 6.4 23:02-00:02 9 5,2 1 1 18 36 6.4 00:02-01:02 14 2,1 18 35 6.3 01:02-02:09 17 6,1 1 16 41 6.1 LM="5.2" at 02:00; 1.12 hours Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 1 1 1.5 3.5 8 13.5 17.5 8.5 1.5 3.17 Aquarids 1 1.5 10 11.5 3 1 3.61 d Aquar. 1 0.5 8 7.5 1 1 3.53 i Aquar. 1 2 4 2 3.78 Capric. 1.5 1.5 0.5 0.5 3.00 k. Cygnids 0.5 0.5 .... sporads. 3 5.5 18 30 27.5 6 4.02 Only a few bright meteors; many faint ones. But good activity. Typical for this time of year. One nice Perseid: see summary of 'bright meteors'.="===================================================================" *Date : 07/08-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 21:00 UT *End : 02:09 UT *Teff : 5.00 hours Period (UT) P A(d,i) C kC spo N LM Remark 21:00-22:00 7 2,2 2 14 27 6.1 LM="4.6" at 21:10 6.0 at 21:40 22:00-23:00 12 2,3 1 6 24 6.1 30% clouds 23:09-00:00 11 3,1 8 23 6.3 0.85 hours 00:00-01:00 17 3,1 1 1 13 36 6.3 01:00-02:09 17 6,- 1 21 45 6.3 LM="5.4" at 02:00; 1.15 hours Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 1 1.5 4.5 5.5 15.5 22 12.5 1.5 3.45 Aquarids 1 1 6.5 8.5 5.5 0.5 3.78 d Aquar. 1 4.5 6 4 0.5 3.84 i Aquar. 1 2 2.5 1.5 3.64 Capric. 1 2 3.67 k. Cygnids 0.5 0.5 1 1 3.83 sporads. 4.5 17.5 25.5 12 2.5 3.85="===================================================================" *Date : 08/09-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 21:15 UT *End : 02:06 UT but ... (see below) *Teff : 0.67 hours Period (UT) P A(d,i) C kC spo N LM Remark 21:15-21:55 6 1 1 11 19 6.0 LM="6.0" at 21:40 After 21:55 no results on tape; failure in data-recorder! Nice surprise this morning (Aug. 9th)... Good activity this night, some brighter meteors made it a perfect night for observations (see 'bright meteors'). Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 0.5 0.5 2 1.5 1.5 2.50 Aquarids d Aquar. i Aquar. Capric. 0.5 0.5 k. Cygnids 1 sporads. 1 2 5.5 2.5 3.41="===================================================================" *Date : 09/10-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 21:10 UT *End : 02:00 UT *Teff : 4.33 hours Period (UT) P A(d,i) C kC spo N LM Remark 21:10-22:15 12 1,3 2 13 31 6.0 LM="5.2" at 21:15; 6.0 at 21:35 1.08 hours 22:15-23:15 12 3,- 1 1 17 34 6.0 23:15-00:15 20 3,- 17 40 6.0 see below! 00:15-01:15 9 2,- 8 19 5.8 0.50 hours! 01:15-02:00 21 2,- 1 17 40 5.8 LM="5.5" at 02:00; 0.75 hours Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 1 1.5 4.5 1 13 18 27.5 7.5 3.01 Aquarids 2 4.5 6.5 1 3.46 d Aquar. 2 2.5 5.5 1 3.50 i Aquar. 2 1 3.33 Capric. 1 0.5 1.5 2.17 k. Cygnids 0.5 0.5 .... sporads. 1.5 1.5 21 40.5 7.5 3.71 Some 'cotton-like' clouds drifted in after 00:05 UT, but disappeared in the first instance. After 00:30 more and more clouds appeared in my field of view. After 01:05 clear again. So half an hour time to recreate and check my data-recorder (ahum ...). Many faint meteors, only a few brighter ones. 'Sweets of the night' was a beautiful 4 Perseid at 01:48:50 UT in Peg. Train for 15 seconds visible! The Caps and i-Aqua's showed only weak activity during the evening-hours. Like Marco said: the Caps-activity is decreasing. The k-Cygnids show weak activity since August the 5th.="===================================================================" *Date : 10/11-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 20:55 UT *End : 01:40 UT *Teff : 4.50 hours Period (UT) P A(d,i) C kC spo N LM Remark 20:55-22:00 19 3,2 3 1 11 39 6.2 LM="5.5" at 21:20; 6.2 at 21:35 1.08 hours 22:00-23:00 20 4,2 9 35 6.2 0.75 hours;tired 23:00-00:00 26 3,3 1 2 17 52 6.3 00:00-01:00 23 1,- 15 39 6.3 01:00-01:40 28 5,- 1 11 45 6.3 Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 1 4 6 10 12 30.5 28.5 17.5 1.5 2.84 Aquarids 1 8 10.5 3.5 3.59 d Aquar. 1 6 7.5 1.5 3.41 i Aquar. 2 3 2 4.00 Capric. 1 0.5 2.5 3.13 k. Cygnids 1 1 0.5 0.5 1 1.88 sporads. 1 1 1.5 6.5 21.5 25 6.5 4.34 A beautiful night, but I was very tired around 22.30 UT. Later in the night, my attention increased. The Cap's did nice in the first half of the night. Perseids are, as can be expected, dominant now.="===================================================================" The night 11/12 August was a fine Perseid maximum night with some two Perseid-fireballs within 1 minute! First, at 01:08 UT a beautiful Perseid of 6 a 8 appeared in UMa. The train was visible for 14 sec.; one minute later a 5 in Aql. *Date : 11/12-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 20:45 UT *End : 02:25 UT *Teff : 5.66 hours Period (UT) P A(d,i) C kC spo N LM Remark 20:45-21:45 24 1,2 11 38 6.1 LM="5.5" at 21:15; 6.1 at 21:35 21:45-22:45 18 3,- 1 14 36 6.3 22:45-23:45 33 4,1 1 15 54 6.3 23:45-00:45 34 2,- 1 1 11 49 6.3 00:45-01:45 48 3,1 1 1 18 72 6.3 01:45-02:25 33 2,1 10 46 6.1 0.66 hours Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 5 8 13.5 22 26.5 50.5 36 22.5 6 2.58 Aquarids 1 2 5.5 9 2.5 3.43 d Aquar. 1 2 5 5 2 3.33 i Aquar. 0.5 4 0.5 4.00 Capric. 0.5 0.5 0.5 0.5 2.50 k. Cygnids 1 0.5 1.5 1 3.63 sporads. 0.5 4 4 17 33 17.5 3 3.80="===================================================================" We first feared that the next night would be a bad one, with many cirrus. But after 18:00 UT the cirrus disappeared slowly, so we could start our observations at 21:15 UT. First there was still some moon-light, but after 21:45 UT conditions were good. The Perseids showed some bright meteors before 22:00 UT (some of them were noticed already between 20:00 and 21:00 UT), but afterwards the show of the brighter ones seems over. But at 00:07 UT we were surprised by a Perseid in UMi with two flares of 5. Rates were typical for a night shortly after the maximum, comparable to the rates in 1993. *Date : 12/13-08-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="18h;" Decl.="70" deg. at 21:00 UT gradually becoming R.A.="23h;" Decl.="70" deg. at 02:00 UT *Start : 21:15 UT *End : 02:20 UT *Teff : 4.92 hours Period (UT) P A(d,i) C kC spo N LM Remark 21:15-22:15 30 1,1 1 3 13 49 6.0 22:15-23:15 26 2,- 2 12 42 6.1 23:15-00:15 38 3,- 2 8 51 6.1 0.83 hours 00:15-01:15 42 3,- 1 15 61 6.1 01:15-02:20 41 1,1 1 11 55 6.0 1.08 hours Stream: <="-2" 1 0 1 2 3 4 5 6 mean: Perseids 2 5 11.5 10.5 27 62.5 45 13 0.5 2.76 Aquarids 1.5 1.5 2.5 6 0.5 3.21 d Aquar. 1.5 1.5 2 4.5 0.5 3.10 i Aquar. 0.5 1.5 3.75 Capric. 0.5 1 0.5 3.00 k. Cygnids 3 0.5 2.5 1.5 0.5 2.50 sporads. 1 1 0.5 14 27 15 0.5 3.90="===================================================================" VISUAL RESULTS LEONIDS 1997 Clear skies in november are very rare in the Netherlands, especially during the Leonids. But 1997 is an exeption! The night 16/17 was partly clear and 17/18 completely. Unfortunately I had to go to work both days. Beiing a teacher isn't always the ideal job... So I observed these nights only for some hours. Below are the results. Observing with Rita Verhoef, Arnold Tukkers, Ralf Mulder, Patrick Schiphorst from our Observatory, and Koen Miskotte and Jos Nijland from 'Biddinghuizen' was very pleasent. Carl Johannink="===================================================================" *Date : 16/17-11-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="02h;" Decl.="75" deg. at 00:30 UT *Start : 00:10 UT *End : 02:15 UT *Teff : 2.08 hours Time(UT): L: T: spo: N: LM: notes: 00:10-01:15 6 1 3 10 5.0 1.08 hours 01:15-02:15 6 1 3 10 5.0 (*) (*)="after" 01:45 UT clouds appeared in the western sky. At 02:15 UT my field of view was obstructed for 40% . End of session.="===================================================================" *Date : 17/18-11-97 *Observer: Johannink, Carl (IMO-code: JOHCA) *Place : Lattrop (Netherlands) *Coord. : 6o 58'E ; 52o26'N *Center : R.A.="02h;" Decl.="75" deg. at 00:30 UT *Start : 23:25 UT *End : 02:25 UT *Teff : 3.00 hours Time(UT): L: T: spo: N: LM: notes: 23:25-00:30 9 1 5 15 5.4 1.08 hours 00:30-01:30 9 6 15 5.4 01:30-02:25 8 4 12 5.4 0.92 hours Other remarks: * Other stream activity: ..................................... Night 28/29-07-97: 3 meteors radiating from a point between alfa and kappa Cyg ; slow moving magnitudes: 3 ; 3 ; 4.5 Night 05/06-08-97: 1 meteor from the Sagittarius-Scorpius- complex ; magnitude: 1 Night 07/08-08-97: during this night we noticed some activity from the region near Aries. These meteors were fast, with a high percentage of trains. Night 08/09-08-97: although not everything worked quite well this night (...), again we saw some meteors from Aries. Night 10/11-08-97: 3 meteors in the morning hours from Aries : 3.5 ; 1.5 ; 4 Night 11/12-08-97: again 3 meteors from this region : 1.5 ; 2.5 ; 4 Night 12/13-08-97: two more 'candidates' from Aries: 3 ; 3 All these meteors were classified as sporadic in all nights. * Bright meteors (-3 and brighter):........................... Night 29/30-07-97: 21:46:40 UT (+/-10sec.) 6 a 8 Capricornid(?) below Aql. Night 04/05-08-97: 23:23:30 UT (+/-10sec.) nice Perseid; 3 in Peg.;yellow 23:28:20 UT (+/-10sec.) beautiful Capricornid; 2 flares 5! in Aql.; yellow 01:22:25 UT (+/- 10 sec.) fine Perseid; 4 in UMa; yellow-white Night 06/07-08-97: 01:55:00 UT (+/- 60 sec.); nice Perseid; flare 3 in Per ; yellow ; short train Night 08/09-08-97: 21:25:00 UT (+/- 10 sec.); beautiful sporadic meteor in Cam; slow moving; yellow; magnitude 0 , flare 3 01.57:02 UT ; beautiful Perseid; 0 , 2 flares 4 in Ari ; yellow ; train 6 sec. Night 09/10-08-97: 01:48:50 UT (+/- 10 sec.); beautiful Perseid; 4 in Peg. ; yellow ; train visible for 15 seconds. One on the finest Perseids we saw in the last four years, but look at 11/12 ... Night 10/11-08-97: 01:19:46 UT (+/- 10 sec.); beautiful Perseid; 3 in Her. ; orange ; train 1 sec. Night 11/12-08-97: 00:54:20 UT ; Perseid 4 in Boo ; yellow and short train 01:08:26 UT ; Perseid 6 in UMa ; flare maybe a bit brighter ; yellow-white; nice train for 14 sec. 01:09:10 UT ; we were still astonished by the 6 one ; Perseid 5 in Aqr ; yellow ; train visible for 10 sec. Night 12/13-08-97: 00:07:10 UT ; Perseid in UMi ; two flares 5 ; orange ; train visible for 15 sec.
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This page was last modified on September 2, 1999 by Casper ter Kuile and Carl Johannink |