IOTA/IOTA-ES occultation update for (1757) Porvoo / HIP 106039 event on 2012 Aug 12, 10:35 UT Visible from Mexico, S USA, New Guinea Summary ------- On 2012 Aug 12 UT, the 13 km diameter asteroid (1757) Porvoo will occult a 4.5 mag star in the constellation Capricornus for observers along a path across Mexico, S USA, New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 12.0 mag to 16.5 mag (the magnitude of the asteroid) for at most 1.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 22 * date and approx. time of event: 2012 Aug 12, 10:27 - 2012 Aug 12, 10:44 UT * geocentric midpoint of event [JD]: 2456151.94155417 * magnitude of target star: 4.5 * magnitude drop [mag]: 12.0 * estimated maximum duration [s]: 1.2 * Moon: 25 % sunlit, 121° distance * Sun: 173° distance * rough path description: Mexico, S USA, New Guinea The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 3.10 * 1 sigma uncertainty interval [seconds]: +/- 6.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .067 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .069", .040", 71° ) * approx speed of asteroid's shadow [km/s]: 11.3396 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 106039 by 1757 Porvoo on 2012 Aug 12 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 ' " Latitude Latitude Latitude Latitude 112 0 0 3 11 41 10 44 39 1 112 -1 3 16 3 3 7 18 3 43 12 .. .. .. 113 0 0 2 48 5 10 44 38 2 112 -2 2 52 26 2 43 43 3 19 31 .. .. .. 114 0 0 2 24 54 10 44 38 3 112 -3 2 29 15 2 20 33 2 56 16 .. .. .. 115 0 0 2 2 9 10 44 37 4 112 -4 2 6 30 1 57 49 2 33 26 1 30 59 116 0 0 1 39 51 10 44 36 5 112 -5 1 44 11 1 35 32 2 11 3 1 8 46 117 0 0 1 17 59 10 44 35 6 112 -6 1 22 18 1 13 40 1 49 7 0 46 58 118 0 0 0 56 34 10 44 34 7 112 -7 1 0 52 0 52 16 1 27 37 0 25 38 119 0 0 0 35 36 10 44 33 8 112 -8 0 39 53 0 31 18 1 6 34 0 4 44 120 0 0 0 15 4 10 44 31 9 112 -10 0 19 22 0 10 48 0 45 58 - 0 15 43 121 0 0 - 0 4 59 10 44 29 10 112 -11 - 0 0 43 - 0 9 16 0 25 50 - 0 35 42 122 0 0 - 0 24 35 10 44 27 11 112 -12 - 0 20 19 - 0 28 51 0 6 10 - 0 55 14 123 0 0 - 0 43 44 10 44 25 12 112 -13 - 0 39 28 - 0 47 59 - 0 13 3 - 1 14 18 124 0 0 - 1 2 24 10 44 22 13 112 -14 - 0 58 9 - 1 6 39 - 0 31 47 - 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4 34 0 10 43 31 27 112 -28 - 4 29 53 - 4 38 8 - 4 4 14 - 5 3 41 139 0 0 - 4 45 31 10 43 26 28 112 -29 - 4 41 24 - 4 49 39 - 4 15 48 - 5 15 9 140 0 0 - 4 56 33 10 43 21 29 112 -30 - 4 52 26 - 5 0 40 - 4 26 53 - 5 26 8 141 0 0 - 5 7 6 10 43 16 30 112 -31 - 5 3 0 - 5 11 13 - 4 37 28 - 5 36 38 142 0 0 - 5 17 10 10 43 10 31 112 -32 - 5 13 4 - 5 21 16 - 4 47 35 - 5 46 40 143 0 0 - 5 26 46 10 43 5 32 112 -33 - 5 22 40 - 5 30 51 - 4 57 13 - 5 56 13 144 0 0 - 5 35 52 10 42 59 33 112 -34 - 5 31 46 - 5 39 57 - 5 6 21 - 6 5 17 145 0 0 - 5 44 29 10 42 54 34 112 -35 - 5 40 24 - 5 48 34 - 5 15 1 - 6 13 52 146 0 0 - 5 52 38 10 42 48 35 113 -36 - 5 48 33 - 5 56 42 - 5 23 11 - 6 21 58 147 0 0 - 6 0 17 10 42 42 36 113 -37 - 5 56 12 - 6 4 22 - 5 30 53 - 6 29 36 148 0 0 - 6 7 28 10 42 36 37 113 -38 - 6 3 23 - 6 11 32 - 5 38 5 - 6 36 45 149 0 0 - 6 14 10 10 42 30 38 113 -39 - 6 10 6 - 6 18 14 - 5 44 49 - 6 43 25 150 0 0 - 6 20 23 10 42 23 39 113 -40 - 6 16 19 - 6 24 27 - 5 51 4 - 6 49 36 151 0 0 - 6 26 7 10 42 17 40 113 -41 - 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6 38 5 178 0 0 - 6 1 52 10 38 45 62 127 -65 - 5 57 48 - 6 5 56 - 5 32 32 - 6 31 7 179 0 0 - 5 54 25 10 38 36 63 128 -66 - 5 50 21 - 5 58 29 - 5 25 3 - 6 23 41 180 0 0 - 5 46 30 10 38 27 64 130 -67 - 5 42 25 - 5 50 34 - 5 17 6 - 6 15 48 -179 0 0 - 5 38 7 10 38 18 64 131 -68 - 5 34 2 - 5 42 12 - 5 8 41 - 6 7 27 -178 0 0 - 5 29 17 10 38 9 65 133 -69 - 5 25 11 - 5 33 22 - 4 59 49 - 5 58 39 -177 0 0 - 5 19 59 10 38 0 66 134 -69 - 5 15 53 - 5 24 4 - 4 50 29 - 5 49 23 -176 0 0 - 5 10 13 10 37 51 66 136 -70 - 5 6 7 - 5 14 19 - 4 40 41 - 5 39 39 -175 0 0 - 5 0 0 10 37 41 67 138 -71 - 4 55 54 - 5 4 6 - 4 30 26 - 5 29 28 -174 0 0 - 4 49 20 10 37 32 67 140 -71 - 4 45 13 - 4 53 26 - 4 19 43 - 5 18 50 -173 0 0 - 4 38 12 10 37 23 68 142 -72 - 4 34 5 - 4 42 18 - 4 8 33 - 5 7 45 -172 0 0 - 4 26 37 10 37 13 68 144 -73 - 4 22 30 - 4 30 44 - 3 56 55 - 4 56 12 -171 0 0 - 4 14 34 10 37 4 69 146 -73 - 4 10 27 - 4 18 42 - 3 44 50 - 4 44 13 -170 0 0 - 4 2 5 10 36 54 69 148 -74 - 3 57 57 - 4 6 13 - 3 32 18 - 4 31 46 -169 0 0 - 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85 0 0 31 50 55 10 27 4 4 241 -8 31 55 28 31 46 21 32 23 48 31 18 9 - 84 0 0 32 16 58 10 27 3 3 242 -7 32 21 31 32 12 25 32 49 49 31 44 16 - 83 0 0 32 42 43 10 27 3 2 243 -6 32 47 16 32 38 10 33 15 30 .. .. .. - 82 0 0 33 8 8 10 27 3 1 243 -5 33 12 41 33 3 36 33 40 52 .. .. .. - 81 0 0 33 33 14 10 27 2 0 244 -4 33 37 46 33 28 43 .. .. .. .. .. .. Uncertainty in time = +/- 7 secs Prediction of 2012 Jun 21.0 Data for the target star ------------------------ * name: HIP 106039 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 28 43.5228 DE: -21 48 25.925 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .006, .003 ) * V mag [mag]: 4.5 * B mag [mag]: 5.4 * Apparent position with proper motion RA(deg): 322.3700903416 DE(deg): -21.7477381802 * Equation of equinoxes (radians) : 0.000072780532948 * Diameter [mas]: 1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1757) Porvoo approx. diameter [km]: 13 approx. diameter ["]: .012 distance from Earth [AU]: 1.50800 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1065 number of rejected observations: 30 time covered by the observations: 1964 Jan 21 - 2011 May 02 1 sigma uncertainty ellipse (major, minor, PA): 0.069, 0.040, 71° remarks: * orbital elements for (1757) Porvoo : Mean anomaly = 117.69210972 deg Arg. of pericenter = 149.44574546 deg Long. of node = 39.47805548 deg Inclination = 3.97827561 deg Eccentricity = 0.12685418 Semimajor axis = 2.35088713 AU Perihelion dist = 2.05266727 AU Mag: H = 13.31, G = 0.15 Epoch of elements : MJD 56151.44100000 TDT (2012 Aug 12.441) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 12 1757 Porvoo 10h 35.8m UT 4.5 21 28 43.523-21 48 25.93HIP 106039 5.4 16.5 14 1.2 1.508 -2.573 -10.48 -158.0632 -21.804 22.28 14.77 10.5973 -0.09615 0.32865 -6.14288 -1.79731 -0.00001 0.00066 2000 117.2980882012 811.00000149.445745 39.478055 3.9782760.12685418 2.3508871 2.052667313.4 5.00.15 RATE 2.7343650 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.069 0.040 71 4.10 0.040 0 1-2 5 056099.0020120812_106039 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 21, 02:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org