Missiles and Rockets: November 11,1963

 https://welib.org/md5/348a5a5ca60c59d47460cfc1e9a8c240

Aviation Week: January 12,1976

 https://welib.org/md5/2918239391a5f7ca36d064d263334b84

Explorer 33

  1966-058A

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Explorer 33 was launched on 1966 Jul 1 at 1602 by a Delta E1 from Launch Complex 17A at Cape Kennedy. The three-stage Delta was meant to put the probe on a lunar intercept trajectory, and a Star 13 solid motor would insert it into a 1300 x 6400 km, 175 deg lunar orbit. The Delta second stage produced excess thrust and lunar orbit could not be reached. It was reported that the planned transfer orbit was 293 x 548920 x 28.8. This could be achieved with a 2.863 km/s burn of the FW4 at around 1621 UTC. A 23m/s overspeed would put IMP in a 300 x 853670 km orbit instead. The Star 13 retromotor was fired at 2032, placing the probe in a lower energy orbit. The burn was carried out at about 60000 km altitude, and slowed the probe by about 1 km/s.

Explorer 33
Date	Time	Event	Orbit
1966 Jul 1	1602:25	Launch by Delta E1	CK LC17A
		T+0:43 SRM burnout
	1603:35	T+1:10 SRM sep
	1604:56	T+2:31 Thor MECO
	1605:00	T+2:35 St 1 sep
	1605:01	T+2:36 Delta S/N 20207 burn	6:19
	1606:03	T+2:51 Fairing
	1611:20	T+9:10 Delta SECO
	1619:12	Spinup
	1619:24	T+16:48 Delta sep	101.64 183 x 1489 x 28.8
	1619:26	T+17:00 FW-4D burn 32s, at 425 km?
	1619:57	T+17:32 FW-4D cutoff
	1620:41	T+19:08? Despin yo-yo weights
	1620:51	Paddles deploy
	1621:21	Stage 3 sep
	1622	Stage 3 tumble yo weight
	1622?		293 x 860741 x 28.9
	2232:57	Star 13 burn	15000? x 500000? x 28.8
	2233:13	Star 13 burnout
1966 Jul 2	0033:47	Star 13 sep
	0800?	Pass EL1:4
1966 Jul 7		434000 km apogee 1
1966 Jul 8		35000 km lunar flyby
1966 Jul 8			30532 x 494230 x 29.0 (SSR)
1966 Jul 13		43000 km perigee 1	43000 x 475000 km x 7.4
1966 Jul 15			40800 x 476233 x 7.5 (SSR)
1966 Jul 21		475000 km apogee 2
1966 Jul 22			40805 x 476289 x 7.5
1966 Jul 29		40600 km perigee 2	40600 x 491000 km x 7.5
1966 Jul 31			15900 x 435425 x 28.7 (SSR)
1966 Aug 2		91500 km lunar flyby
1966 Aug 2		491000 km apogee 3	60000 x 491000 km x 12.0
1966 Aug 15		60000 km perigee 3	60000 x 514000 x 14.0
1966 Aug 23
1966 Aug 24		508000 km apogee 4
1966 Sep 2		59000 km perigee 4	59000 x 508000 x 13.8
1966 Sep 11		508000 km apogee 5
1966 Sep 20		56400 km perigee 5
1966 Sep 27		Lunar flyby 2, 60000 km
		XYZ(SE) = -57, 40, 0
1966 Sep 28		XYZ(SE) = -65, 38, -5
1966 Sep 30		XYZ(SE) = -60, 28, -16
1966 Sep 30		468000 km apogee 6
1966 Oct 6		76600 km perigee 6	76600 x 478000 x 21.8
1966 Oct 12			79526 x 477378 x 21.7 (TLE)
1966 Nov 20		Lunar flyby 3, 59000 km	43000 x 452000 x 22.0
1966 Dec 16		Lunar flyby 4, 51000 km	30500 x 458000 x 27.7
1967 Jan 13		Lunar flyby 5, 58000 km	26000 x 458000 x 35.1
1967 Feb 7		Lunar flyby 6, 56000 km	37800 x 446000 x 43.3
1967 Mar 6		Lunar flyby 7, 58400 km	90600 x 432000 x 48.5
1967 Apr 28			98439 x 431337 x 49.2
1967 Apr 30		115000 km from Moon
1967 May 27		Lunar flyby 8, 45900 km	98600 x 488000 x 41.8
1967 Jun 7			36500 x 427500 x 30.9 (IFR)
1967 Jun 10
1967 Jun 23		111800 km from Moon
1967 Jul 13			20300 x 408200 x 28.9 (IFR)
1967 Jul 31			98438 x 431334 x 49.2 (SSR)
1967 Aug 16		Lunar flyby 9, 28800 km
1967 Aug 25		Perigee	63200 x 430000 x 37.3 (IFR)
1967 Sep 13		81800 km from Moon
1967 Oct 20
1967 Oct 27			98439 x 431339 x 49.2 (TLE)
1967 Dec 15			115679 x 472832 x 40.4 (SSR)
1968 Jan 22			80166 x 484230 x 40.6
1968 Jan 26		80900 km from Moon
1968 Jan 31			90292 x 478603 x 41.3 (SSR)
1968 Feb 11			85228 x 481417 x 40.9 (SSR)
1968 Feb 14			69500 x 480000 x 39.5 (IFR)
1968 Feb 28			80165 x 484230 x 40.5 (SSR)
1968 Apr 15			89110 x 481271 x 42.6 (SSR)
1968 May 19			158600 x 558600 x 24.0 (predict)
1968 May 31			89527 x 466159 x 44.6 (SSR)
1968 Sep 15			78393 x 457886 x 58.8 (SSR)
1968 Oct 10
1968 Oct 31			92958 x 461113 x 59.1 (SSR)
1968 Dec 12			162227 x 479414 x 60.6
1968 Dec 31			168550 x 495137 x 60.5 (SSR)
1969 Feb 15			162471 x 480118 x 60.6 (SSR)
1969 Mar 31			267240 x 852531 x 56.7 (SSR)
1969 Jul 31			267229 x 852493 x 56.7 (SSR)
1969 Nov 25			416751 x 421611 x 34.7
1969 Dec 15			145372 x 668432 x 35.3 (SSR)
1970 Jan 15			176127 x 662236 x 34.6 (SSR)
1970 May 31			170656 x 656012 x 28.1 (SSR)
1970 Jun 22			246128 x 638118 x 24.8
1970 Nov 30			196568 x 510727 x 23.4 (SSR)
1971 Feb 28			239142 x 469015 x 24.8 (SSR)
1971 Apr 1			294241 x 502196 x 24.0
1971 May 12			265678 x 480760 x 24.1
1971 May 31		end of ops