IOTA/IOTA-ES occultation update for (785) Zwetana / HIP 60628 event on 2009 Jun 06, 10:07 UT Visible from Summary ------- On 2009 Jun 06 UT, the 49 km diameter asteroid (785) Zwetana will occult a 8.2 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 13.1 mag (the magnitude of the asteroid) for at most 3.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 93 * date and approx. time of event: 2009 Jun 06, 10:07 - 2009 Jun 06, 10:13 UT * magnitude of target star: 8.2 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 3.5 * Moon: 98 % sunlit, 61° distance * Sun: 106° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .018) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .016", 112° ) * approx speed of asteroid's shadow [km/s]: 13.9390 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 60628 by 785 Zwetana on 2009 Jun 6 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Longitude Longitude Longitude Longitude 142 3 19 -80 0 0 10 13 31 0 356 -27 140 31 28 143 35 4 139 4 56 145 1 15 141 39 21 -79 0 0 10 13 31 1 357 -27 140 15 44 143 2 50 138 57 0 144 21 16 141 15 54 -78 0 0 10 13 31 2 357 -27 139 59 10 142 32 32 138 46 54 143 44 30 140 52 52 -77 0 0 10 13 30 3 357 -27 139 41 56 142 3 42 138 35 8 143 10 13 140 30 8 -76 0 0 10 13 29 4 358 -28 139 24 10 141 36 1 138 22 3 142 37 52 140 7 40 -75 0 0 10 13 29 5 358 -28 139 5 59 141 9 15 138 7 54 142 7 5 139 45 23 -74 0 0 10 13 28 6 358 -28 138 47 27 140 43 13 137 52 54 141 37 32 139 23 15 -73 0 0 10 13 27 7 359 -28 138 28 37 140 17 48 137 37 10 141 9 1 139 1 14 -72 0 0 10 13 25 8 359 -28 138 9 31 139 52 52 137 20 50 140 41 20 138 39 19 -71 0 0 10 13 24 9 360 -29 137 50 13 139 28 20 137 3 59 140 14 22 138 17 28 -70 0 0 10 13 22 10 360 -29 137 30 42 139 4 9 136 46 40 139 47 59 137 55 40 -69 0 0 10 13 20 11 0 -29 137 11 1 138 40 14 136 28 58 139 22 5 137 33 54 -68 0 0 10 13 18 12 1 -29 136 51 9 138 16 34 136 10 55 138 56 37 137 12 9 -67 0 0 10 13 16 13 1 -29 136 31 9 137 53 5 135 52 33 138 31 30 136 50 24 -66 0 0 10 13 14 14 1 -29 136 11 0 137 29 45 135 33 53 138 6 41 136 28 39 -65 0 0 10 13 11 15 2 -29 135 50 42 137 6 33 135 14 57 137 42 7 136 6 53 -64 0 0 10 13 9 16 2 -29 135 30 16 136 43 26 134 55 47 137 17 45 135 45 5 -63 0 0 10 13 6 17 3 -29 135 9 42 136 20 25 134 36 23 136 53 34 135 23 15 -62 0 0 10 13 3 18 3 -29 134 49 1 135 57 27 134 16 46 136 29 32 135 1 23 -61 0 0 10 13 0 19 3 -29 134 28 11 135 34 31 133 56 56 136 5 37 134 39 27 -60 0 0 10 12 56 20 4 -29 134 7 14 135 11 36 133 36 54 135 41 47 134 17 27 -59 0 0 10 12 53 21 4 -28 133 46 9 134 48 42 133 16 40 135 18 2 133 55 23 -58 0 0 10 12 49 22 5 -28 133 24 55 134 25 47 132 56 14 134 54 19 133 33 14 -57 0 0 10 12 45 23 5 -28 133 3 34 134 2 51 132 35 37 134 30 39 133 11 0 -56 0 0 10 12 41 24 6 -28 132 42 4 133 39 53 132 14 49 134 6 59 132 48 40 -55 0 0 10 12 37 25 6 -28 132 20 25 133 16 51 131 53 50 133 43 18 132 26 14 -54 0 0 10 12 33 26 7 -27 131 58 38 132 53 46 131 32 39 133 19 37 132 3 41 -53 0 0 10 12 28 27 7 -27 131 36 42 132 30 37 131 11 17 132 55 54 131 41 1 -52 0 0 10 12 24 28 8 -27 131 14 36 132 7 23 130 49 43 132 32 8 131 18 13 -51 0 0 10 12 19 29 8 -26 130 52 20 131 44 3 130 27 58 132 8 18 130 55 17 -50 0 0 10 12 14 30 9 -26 130 29 54 131 20 37 130 6 0 131 44 23 130 32 13 -49 0 0 10 12 9 31 9 -26 130 7 18 130 57 4 129 43 51 131 20 24 130 8 59 -48 0 0 10 12 4 32 10 -25 129 44 31 130 33 24 129 21 29 130 56 18 129 45 36 -47 0 0 10 11 58 33 10 -25 129 21 33 130 9 35 128 58 54 130 32 6 129 22 2 -46 0 0 10 11 53 34 11 -25 128 58 23 129 45 38 128 36 6 130 7 47 128 58 17 -45 0 0 10 11 47 35 12 -24 128 35 1 129 21 31 128 13 5 129 43 19 128 34 22 -44 0 0 10 11 42 36 12 -24 128 11 26 128 57 15 127 49 50 129 18 43 128 10 14 -43 0 0 10 11 36 37 13 -23 127 47 38 128 32 47 127 26 21 128 53 57 127 45 54 -42 0 0 10 11 29 37 14 -23 127 23 36 128 8 8 127 2 37 128 29 0 127 21 20 -41 0 0 10 11 23 38 14 -22 126 59 20 127 43 18 126 38 37 128 3 53 126 56 33 -40 0 0 10 11 17 39 15 -22 126 34 50 127 18 14 126 14 22 127 38 34 126 31 32 -39 0 0 10 11 10 40 16 -21 126 10 4 126 52 57 125 49 50 127 13 3 126 6 15 -38 0 0 10 11 4 41 17 -21 125 45 2 126 27 26 125 25 2 126 47 18 125 40 43 -37 0 0 10 10 57 42 18 -20 125 19 43 126 1 40 124 59 56 126 21 19 125 14 54 -36 0 0 10 10 50 43 18 -19 124 54 7 125 35 39 124 34 31 125 55 6 124 48 48 -35 0 0 10 10 43 43 19 -19 124 28 12 125 9 21 124 8 48 125 28 37 124 22 24 -34 0 0 10 10 36 44 20 -18 124 1 59 124 42 45 123 42 45 125 1 51 123 55 41 -33 0 0 10 10 29 45 21 -18 123 35 26 124 15 52 123 16 22 124 34 48 123 28 38 -32 0 0 10 10 21 46 22 -17 123 8 33 123 48 40 122 49 38 124 7 27 123 1 15 -31 0 0 10 10 14 47 23 -16 122 41 19 123 21 8 122 22 31 123 39 47 122 33 30 -30 0 0 10 10 6 47 24 -15 122 13 42 122 53 15 121 55 2 123 11 46 122 5 22 -29 0 0 10 9 58 48 26 -15 121 45 42 122 25 0 121 27 9 122 43 25 121 36 52 -28 0 0 10 9 50 49 27 -14 121 17 17 121 56 23 120 58 51 122 14 41 121 7 56 -27 0 0 10 9 42 49 28 -13 120 48 28 121 27 21 120 30 7 121 45 34 120 38 35 -26 0 0 10 9 34 50 29 -13 120 19 12 120 57 55 120 0 56 121 16 3 120 8 47 -25 0 0 10 9 26 51 31 -12 119 49 29 120 28 3 119 31 17 120 46 6 119 38 32 -24 0 0 10 9 18 51 32 -11 119 19 17 119 57 43 119 1 9 120 15 42 119 7 46 -23 0 0 10 9 9 52 33 -10 118 48 35 119 26 54 118 30 30 119 44 50 118 36 31 -22 0 0 10 9 1 52 35 -9 118 17 22 118 55 36 117 59 19 119 13 29 118 4 43 -21 0 0 10 8 52 53 36 -8 117 45 36 118 23 46 117 27 35 118 41 37 117 32 21 -20 0 0 10 8 43 53 38 -8 117 13 16 117 51 23 116 55 16 118 9 13 116 59 24 -19 0 0 10 8 34 54 40 -7 116 40 20 117 18 25 116 22 20 117 36 15 116 25 51 -18 0 0 10 8 26 54 41 -6 116 6 46 116 44 52 115 48 46 117 2 41 115 51 38 -17 0 0 10 8 16 55 43 -5 115 32 33 116 10 40 115 14 33 116 28 30 115 16 45 -16 0 0 10 8 7 55 45 -4 114 57 38 115 35 48 114 39 37 115 53 39 114 41 10 -15 0 0 10 7 58 55 47 -3 114 22 1 115 0 15 114 3 57 115 18 7 114 4 49 -14 0 0 10 7 49 55 48 -2 113 45 37 114 23 57 113 27 31 114 41 52 113 27 42 -13 0 0 10 7 39 56 50 -1 113 8 26 113 46 53 112 50 16 114 4 52 112 49 45 -12 0 0 10 7 30 56 52 0 112 30 25 113 9 1 112 12 10 113 27 3 Uncertainty in time = +/- 2 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 60628 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 25 31.1616 DE: +09 45 06.167 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .015, .011 ) * V mag [mag]: 8.2 * B mag [mag]: 9.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (785) Zwetana approx. diameter [km]: 49 approx. diameter ["]: .045 distance from Earth [AU]: 1.50600 * orbital information: orbit source: Preston date of fit: 2008 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 795 number of rejected observations: 89 time covered by the observations: 1930 Jan 17 - 2008 Mar 24 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.012, 118° remarks: * orbital elements for (785) Zwetana : Mean anomaly = 5.12901985 deg Arg. of pericenter = 130.00537801 deg Long. of node = 72.17476519 deg Inclination = 12.73012120 deg Eccentricity = 0.20990401 Semimajor axis = 2.56952522 AU Perihelion dist = 2.03017157 AU Mag: H = 9.32, G = 0.15 Epoch of elements : MJD 54988.42200000 TDT (2009 Jun 06.422) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 6 785 Zwetana 10h 7.2m UT 8.2 12 25 31.162 9 45 6.17HIP 60628 9.6 13.1 49 3.5 1.506 1.787 -37.59 139.6129 9.762 27.87 22.69 10.1207 -0.46104 -0.32320 4.52078 -6.43905 0.00437 -0.00223 2000 3.1137192009 529.00000130.005378 72.174765 12.7301210.20990401 2.5695252 2.0301716 9.5 5.00.15 RATE 2.3929010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.016 112 1.47 0.021 0 54786.5020090606__60628 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 17:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org