Hypatia occultation timed from 6 sites on 2001 March 6
Updated: 2002 Feb. 8Below is the final listing for observers of the occultation and appulse of SAO 138387 = HIP 57295 by (238) Hypatia on 2001 Mar. 6. The first column gives the reported duration of the occultation while the next columns give the predicted (based on M. Federspiel's updated prediction) track number and U.T. of closest approach (the actual occultation was about 0.1 min. earlier than this time). Tracks are parallel to the central line and displaced from it by 1.80 km (1.12 miles) for each track, which corresponds to 0.001 arc second in the sky; multiply the track number by 1.80 km (1.12 miles) to obtain the distance from the updated central line. A "--" in the first column means that the observer was able to monitor the star during at least the minutes surrounding the closest approach time and saw and/or recorded no occultation. The duration is given only to the nearest 0.1 second, although in a couple of cases the observer gave the time to 0.01 second. The predicted path width was about 100 tracks. The actual northern limit must have been very close to Nugent's station, at 22N or 23N (the actual path was 0.3 path-width southwest of Federspiel's updated path), so the southern limit should have been at about 77S, but there was nobody watching near there, as far as I know. The next step will be to try to reduce the observations to the skyplane and fit an ellipse to them. Predicted W. Dur. U.T. Long. Lat. h Location Observer s Track h m o o m -- 173N 7 8.6 90.341 38.585 0 ST.LOUIS MO WAYNE E. CLARK -- 133N 7 8.1 86.567 34.717 0 Madison, AL David Nance, C8 -- 60N 7 7.7 85.042 31.857 131 GEORGETO GA TONY P. MURRAY -- 38N 7 8.4 89.888 35.136 88 MEMPHIS TN BEN HUDGENS -- 37N 7 7.0 80.517 27.847 0 Sebastian, FL Richie Bookamer -- 24N 7 8.0 87.677 33.107 46 Tuscaloosa, AL Richard Nugent 8.2 14N 7 10.9 114.114 51.0861101 Calgary, AB Gary BillingsC14,CCDscan 8.0 13N 7 9.1 95.794 39.024 315 Topeka, KS Richard Wilds, 7"R 10.1 4N 7 6.9 80.245 26.916 0 Jupiter, FL Mike Palermiti 9.3 9S 7 7.2 82.354 28.271 0 Quail Hollow Ob FL Richard Kowalski 10.2 22S 7 7.2 82.430 28.039 13 Tampa, FL Craig MacDougal, 15cmL 10.0 31S 7 7.1 82.104 27.603 40 Duette, FL David Dunham, 13cmC -- 101S 7 9.2 97.476 37.728 427 Wichita, KS Martin Ratcliffe, 11in.C -- 107S 7 8.2 90.297 32.255 0 JACKSON MS BENNY J. ROBERTS The actual observation stations are listed below. Click here for an explanation of the codes. Stations, observers, and their coordinates. Location Code Latitude Longitude Observer # Height Duette,Florida O 273610. -820613. David Dunham 1F 132. Tampa,Florida O 280219.2 -822549.2 Craig MacDougal 2 13. Topeka, Kansas O 390235.4 -954737.3 Richard Wilds 3 315. QuailHollow Ob,FL D 28.27122 -82.35440 Richard Kowalski 4 0. Jupiter,FL O 265457. -801442. Mike Palermiti 5 0. Calgary,AB O 510510. -1140651. Gary Billings 6 1101. Tuscaloosa,AL D 33.10683 -87.62698 Richard Nugent 200 0. Sebastion,FL M 2750.847 -8031.046 Richie Bookamer 201 0. Event Timings. B1950 Date U.T. R.A. Star Dec. Ev P.E. Identification, remarks # YearMoDy h m s h m s o ' " 20010306.70653.49114218.568 -14538.52 1 0.7 David Dunham 13cmC 1 20010306.70703.49114218.568 -14538.52 2 0.7 David Dunham 1 20010306.70657.55114218.568 -14538.52 1 0.5 Craig MacDougal 15cmL 2 20010306.70707.40114218.568 -14538.52 2 0.5 Craig MacDougal 2 20010306.70853.46114218.568 -14538.52 1 Richard Wilds, 7"R 3 20010306.70901.45114218.568 -14538.52 2 Richard Wilds 3 20010306.70657.99114218.568 -14538.52 1 0.6 Richard Kowalski 4 20010306.70707.99114218.568 -14538.52 2 0.4 Richard Kowalski 4 20010306.70640.05114218.568 -14538.52 1 Mike Palermiti 5 20010306.70650.11114218.568 -14538.52 2 Mike Palermiti 5 20010306.071042.9114218.568 -14538.52 1 Gary Billings +-0.7s 6 20010306.071051.1114218.568 -14538.52 2 Gary Billings C14,CCDscan 6 The observed chords plotted on the sky plane at Hypatia have been fitted with an ellipse with the following parameters: a: 76.2 +/-4.0 km b: 59.4 +/-3.6 km X0: -150.0 +/-1.6 km Y0: -938.7 +/-2.2 km PA: 38.0 +/-4.0 deg. where "a" is the semi-major axis, "b" is the semi-minor axis, "X0" is the X coordinate of the center (difference in R.A. from the prediction multiplied by the distance to the asteroid), "Y0" is the Y coordinate of the center (difference in Dec. from the prediction multiplied by the distance to the asteroid), and "PA" is the position angle of the minor axis measured from north. Click here to see the sky plane plot of the observed chords and the ellipse. David Dunham, IOTA dunham@erols.com