IOTA/IOTA-ES occultation update for (790) Pretoria / TYC 1723-00466-1 event on 2009 Jun 03, 18:20 UT Visible from Summary ------- On 2009 Jun 03 UT, the 170 km diameter asteroid (790) Pretoria will occult a 10.5 mag star in the constellation Pegasus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 13.9 mag (the magnitude of the asteroid) for at most 6.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2009 Jun 03, 18:16 - 2009 Jun 03, 18:19 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 6.5 * Moon: 84 % sunlit, 150° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 172 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .021", 81° ) * approx speed of asteroid's shadow [km/s]: 26.3694 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1723-00466-1 by 790 Pretoria on 2009 Jun 3 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 108 18 49 -31 0 0 18 16 39 1 68 -68 110 38 27 ... .. .. 112 3 32 ... .. .. 111 2 54 -30 0 0 18 16 40 3 67 -66 113 11 59 108 46 18 114 31 15 107 14 9 Latitude Latitude Latitude Latitude 112 0 0 -29 37 44 18 16 40 4 66 -65 -30 28 47 -28 46 34 -31 1 23 -28 13 44 113 0 0 -29 13 34 18 16 40 5 66 -64 -30 4 52 -28 22 7 -30 37 38 -27 49 7 114 0 0 -28 48 34 18 16 41 6 65 -63 -29 40 9 -27 56 51 -30 13 6 -27 23 40 115 0 0 -28 22 46 18 16 41 7 65 -63 -29 14 38 -27 30 45 -29 47 45 -26 57 23 116 0 0 -27 56 7 18 16 42 8 64 -62 -28 48 16 -27 3 49 -29 21 35 -26 30 16 117 0 0 -27 28 38 18 16 42 9 64 -61 -28 21 5 -26 36 2 -28 54 34 -26 2 17 118 0 0 -27 0 17 18 16 43 10 63 -60 -27 53 2 -26 7 23 -28 26 44 -25 33 26 119 0 0 -26 31 5 18 16 44 11 63 -59 -27 24 8 -25 37 52 -27 58 1 -25 3 43 120 0 0 -26 1 0 18 16 45 12 63 -58 -26 54 22 -25 7 27 -27 28 28 -24 33 6 121 0 0 -25 30 2 18 16 46 13 62 -57 -26 23 44 -24 36 10 -26 58 1 -24 1 36 122 0 0 -24 58 10 18 16 47 14 62 -56 -25 52 12 -24 3 58 -26 26 42 -23 29 12 123 0 0 -24 25 24 18 16 48 15 61 -55 -25 19 46 -23 30 52 -25 54 29 -22 55 52 124 0 0 -23 51 44 18 16 49 16 61 -54 -24 46 26 -22 56 51 -25 21 22 -22 21 38 125 0 0 -23 17 8 18 16 50 18 61 -54 -24 12 11 -22 21 54 -24 47 21 -21 46 27 126 0 0 -22 41 36 18 16 52 19 60 -53 -23 37 1 -21 46 1 -24 12 24 -21 10 20 127 0 0 -22 5 9 18 16 53 20 60 -52 -23 0 55 -21 9 12 -23 36 32 -20 33 17 128 0 0 -21 27 45 18 16 55 21 59 -50 -22 23 53 -20 31 25 -22 59 43 -19 55 17 129 0 0 -20 49 24 18 16 57 22 59 -49 -21 45 54 -19 52 42 -22 21 59 -19 16 19 130 0 0 -20 10 6 18 16 59 23 59 -48 -21 6 58 -19 13 2 -21 43 17 -18 36 24 131 0 0 -19 29 50 18 17 1 24 58 -47 -20 27 6 -18 32 23 -21 3 39 -17 55 31 132 0 0 -18 48 37 18 17 3 25 58 -46 -19 46 16 -17 50 47 -20 23 3 -17 13 40 133 0 0 -18 6 27 18 17 5 27 58 -45 -19 4 28 -17 8 14 -19 41 30 -16 30 51 134 0 0 -17 23 19 18 17 7 28 58 -44 -18 21 43 -16 24 42 -18 59 0 -15 47 5 135 0 0 -16 39 13 18 17 10 29 57 -43 -17 38 1 -15 40 13 -18 15 32 -15 2 21 136 0 0 -15 54 10 18 17 12 30 57 -42 -16 53 21 -14 54 47 -17 31 7 -14 16 39 137 0 0 -15 8 11 18 17 15 32 57 -41 -16 7 44 -14 8 24 -16 45 46 -13 30 1 138 0 0 -14 21 14 18 17 18 33 57 -39 -15 21 11 -13 21 4 -15 59 27 -12 42 25 139 0 0 -13 33 21 18 17 21 34 57 -38 -14 33 42 -12 32 48 -15 12 12 -11 53 54 140 0 0 -12 44 33 18 17 24 35 57 -37 -13 45 17 -11 43 36 -14 24 2 -11 4 28 141 0 0 -11 54 50 18 17 27 37 56 -36 -12 55 57 -10 53 30 -13 34 57 -10 14 7 142 0 0 -11 4 14 18 17 31 38 56 -35 -12 5 43 -10 2 30 -12 44 57 - 9 22 52 143 0 0 -10 12 44 18 17 34 39 56 -33 -11 14 36 - 9 10 38 -11 54 4 - 8 30 46 144 0 0 - 9 20 23 18 17 38 40 56 -32 -10 22 37 - 8 17 55 -11 2 20 - 7 37 48 145 0 0 - 8 27 12 18 17 41 42 56 -31 - 9 29 48 - 7 24 22 -10 9 44 - 6 44 0 146 0 0 - 7 33 12 18 17 45 43 56 -30 - 8 36 9 - 6 30 0 - 9 16 19 - 5 49 25 147 0 0 - 6 38 25 18 17 49 44 56 -28 - 7 41 43 - 5 34 52 - 8 22 6 - 4 54 4 148 0 0 - 5 42 53 18 17 53 46 56 -27 - 6 46 31 - 4 39 0 - 7 27 7 - 3 57 58 149 0 0 - 4 46 38 18 17 58 47 57 -26 - 5 50 35 - 3 42 25 - 6 31 24 - 3 1 10 150 0 0 - 3 49 42 18 18 2 49 57 -25 - 4 53 58 - 2 45 9 - 5 34 58 - 2 3 42 151 0 0 - 2 52 7 18 18 7 50 57 -23 - 3 56 41 - 1 47 16 - 4 37 53 - 1 5 37 152 0 0 - 1 53 55 18 18 11 51 57 -22 - 2 58 47 - 0 48 48 - 3 40 10 - 0 6 57 153 0 0 - 0 55 11 18 18 16 53 58 -21 - 2 0 19 0 10 14 - 2 41 52 0 52 15 154 0 0 0 4 5 18 18 21 54 58 -19 - 1 1 19 1 9 45 - 1 43 2 1 51 56 155 0 0 1 3 48 18 18 26 55 58 -18 - 0 1 50 2 9 42 - 0 43 43 2 52 3 156 0 0 2 3 55 18 18 31 57 59 -17 0 58 4 3 10 3 0 16 3 3 52 32 157 0 0 3 4 25 18 18 36 58 59 -15 1 58 21 4 10 45 1 16 13 4 53 22 158 0 0 4 5 12 18 18 41 60 60 -14 2 58 57 5 11 43 2 16 42 5 54 27 159 0 0 5 6 14 18 18 46 61 61 -13 3 59 50 6 12 55 3 17 28 6 55 45 160 0 0 6 7 27 18 18 52 62 62 -11 5 0 54 7 14 17 4 18 27 7 57 13 161 0 0 7 8 48 18 18 57 64 63 -10 6 2 8 8 15 45 5 19 36 8 58 45 162 0 0 8 10 12 18 19 3 65 64 -9 7 3 26 9 17 15 6 20 51 10 0 19 163 0 0 9 11 37 18 19 8 66 65 -7 8 4 47 10 18 45 7 22 8 11 1 52 164 0 0 10 12 59 18 19 14 68 66 -6 9 6 5 11 20 9 8 23 24 12 3 18 165 0 0 11 14 13 18 19 20 69 68 -5 10 7 18 12 21 25 9 24 36 13 4 35 166 0 0 12 15 17 18 19 25 70 70 -3 11 8 21 13 22 29 10 25 39 14 5 39 167 0 0 13 16 6 18 19 31 72 72 -2 12 9 12 14 23 17 11 26 30 15 6 26 168 0 0 14 16 38 18 19 37 73 74 -1 13 9 46 15 23 46 12 27 6 16 6 53 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1723-00466-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 29 24.3536 DE: +18 11 14.519 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .019 ) * V mag [mag]: 10.5 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (790) Pretoria approx. diameter [km]: 170 approx. diameter ["]: .074 distance from Earth [AU]: 3.15600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 692 number of rejected observations: 63 time covered by the observations: 1924 Jan 05 - 2008 Feb 08 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.010, 72° remarks: * orbital elements for (790) Pretoria : Mean anomaly = 36.74072463 deg Arg. of pericenter = 39.66943593 deg Long. of node = 252.09344077 deg Inclination = 20.52029465 deg Eccentricity = 0.15168148 Semimajor axis = 3.41232614 AU Perihelion dist = 2.89473946 AU Mag: H = 8.02, G = 0.15 Epoch of elements : MJD 54985.76400000 TDT (2009 Jun 03.764) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 3 790 Pretoria 18h 20.6m UT 10.5 23 29 24.354 18 11 14.52TYC 1723-00466-1 11.3 13.9 170 6.5 3.156 2.181 27.46 -175.1451 18.180 -95.60 22.40 18.3440 -0.09669 0.11119 11.15506 9.85330 -0.00511 -0.00174 2000 35.8394612009 529.00000 39.669436252.093441 20.5202950.15168148 3.4123261 2.8947395 8.0 5.00.15 RATE 1.5636090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.021 81 1.32 0.024 0 54545.5020090603_0466-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org