IOTA/IOTA-ES occultation update for (4609) Pizarro / TYC 5223-00631-1 event on 2012 Oct 30, 11:01 UT Visible from New Guinea Summary ------- On 2012 Oct 30 UT, the 27 km diameter asteroid (4609) Pizarro will occult a 9.4 mag star in the constellation Aquarius for observers along a path across New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.2 mag to 16.6 mag (the magnitude of the asteroid) for at most 3.0 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: 21 * date and approx. time of event: 2012 Oct 30, 10:55 - 2012 Oct 30, 11:13 UT * geocentric midpoint of event [JD]: 2456230.95923333 * magnitude of target star: 9.4 * magnitude drop [mag]: 7.2 * estimated maximum duration [s]: 3.0 * Moon: 100 % sunlit, 74° distance * Sun: 112° distance * rough path description: New Guinea The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 3.23 * 1 sigma uncertainty interval [seconds]: +/- 11.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .046) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .046", 82° ) * approx speed of asteroid's shadow [km/s]: 8.9881 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5223-00631-1 by 4609 Pizarro on 2012 Oct 30 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 100 0 0 9 30 21 10 55 16 59 119 0 9 22 16 9 38 25 8 30 6 10 30 38 101 0 0 9 2 42 10 55 28 60 120 -1 8 54 37 9 10 47 8 2 24 10 3 3 102 0 0 8 34 52 10 55 40 61 120 -2 8 26 46 8 42 57 7 34 30 9 35 16 103 0 0 8 6 51 10 55 53 62 120 -3 7 58 45 8 14 57 7 6 26 9 7 19 104 0 0 7 38 41 10 56 5 64 121 -4 7 30 34 7 46 47 6 38 13 8 39 12 105 0 0 7 10 22 10 56 18 65 121 -5 7 2 15 7 18 29 6 9 52 8 10 55 106 0 0 6 41 55 10 56 31 66 122 -6 6 33 48 6 50 2 5 41 22 7 42 31 107 0 0 6 13 21 10 56 44 67 122 -7 6 5 13 6 21 28 5 12 46 7 13 59 108 0 0 5 44 40 10 56 57 68 122 -7 5 36 33 5 52 48 4 44 4 6 45 20 109 0 0 5 15 54 10 57 11 69 123 -8 5 7 46 5 24 2 4 15 16 6 16 36 110 0 0 4 47 4 10 57 24 70 124 -9 4 38 56 4 55 12 3 46 24 5 47 46 111 0 0 4 18 9 10 57 38 72 124 -10 4 10 1 4 26 17 3 17 29 5 18 53 112 0 0 3 49 12 10 57 51 73 125 -11 3 41 4 3 57 20 2 48 31 4 49 56 113 0 0 3 20 12 10 58 5 74 126 -12 3 12 4 3 28 21 2 19 31 4 20 57 114 0 0 2 51 12 10 58 19 75 127 -13 2 43 4 2 59 20 1 50 31 3 51 57 115 0 0 2 22 11 10 58 33 76 128 -14 2 14 3 2 30 20 1 21 30 3 22 56 116 0 0 1 53 11 10 58 47 77 129 -15 1 45 3 2 1 20 0 52 31 2 53 55 117 0 0 1 24 13 10 59 1 78 130 -16 1 16 5 1 32 21 0 23 33 2 24 56 118 0 0 0 55 17 10 59 15 80 132 -17 0 47 9 1 3 25 - 0 5 21 1 55 59 119 0 0 0 26 24 10 59 29 81 134 -18 0 18 17 0 34 32 - 0 34 12 1 27 5 120 0 0 - 0 2 24 10 59 44 82 137 -18 - 0 10 31 0 5 44 - 1 2 59 0 58 15 121 0 0 - 0 31 7 10 59 58 83 141 -19 - 0 39 14 - 0 23 0 - 1 31 40 0 29 30 122 0 0 - 0 59 44 11 0 12 84 145 -20 - 1 7 51 - 0 51 37 - 2 0 15 0 0 50 123 0 0 - 1 28 14 11 0 26 85 152 -21 - 1 36 21 - 1 20 8 - 2 28 42 - 0 27 42 124 0 0 - 1 56 37 11 0 41 86 161 -22 - 2 4 43 - 1 48 30 - 2 57 2 - 0 56 8 125 0 0 - 2 24 51 11 0 55 86 174 -23 - 2 32 56 - 2 16 45 - 3 25 12 - 1 24 25 126 0 0 - 2 52 55 11 1 9 87 192 -24 - 3 1 0 - 2 44 50 - 3 53 13 - 1 52 33 127 0 0 - 3 20 49 11 1 24 87 212 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54 24 -10 1 27 - 8 3 9 141 0 0 - 9 26 35 11 4 38 73 280 -36 - 9 34 30 - 9 18 40 -10 25 35 - 8 27 30 142 0 0 - 9 50 30 11 4 51 72 281 -37 - 9 58 24 - 9 42 36 -10 49 24 - 8 51 32 143 0 0 -10 14 5 11 5 4 71 281 -38 -10 21 58 -10 6 11 -11 12 52 - 9 15 13 144 0 0 -10 37 18 11 5 17 70 281 -39 -10 45 10 -10 29 26 -11 35 59 - 9 38 33 145 0 0 -11 0 10 11 5 30 69 282 -39 -11 8 1 -10 52 18 -11 58 44 -10 1 31 146 0 0 -11 22 40 11 5 43 68 282 -40 -11 30 30 -11 14 49 -12 21 7 -10 24 8 147 0 0 -11 44 47 11 5 55 67 282 -41 -11 52 37 -11 36 58 -12 43 8 -10 46 22 148 0 0 -12 6 32 11 6 7 66 282 -41 -12 14 21 -11 58 44 -13 4 46 -11 8 14 149 0 0 -12 27 54 11 6 20 65 282 -42 -12 35 42 -12 20 7 -13 26 1 -11 29 43 150 0 0 -12 48 53 11 6 32 63 282 -43 -12 56 40 -12 41 6 -13 46 53 -11 50 48 151 0 0 -13 9 28 11 6 44 62 282 -43 -13 17 14 -13 1 42 -14 7 21 -12 11 30 152 0 0 -13 29 39 11 6 55 61 282 -44 -13 37 24 -13 21 54 -14 27 26 -12 31 48 153 0 0 -13 49 26 11 7 7 60 282 -45 -13 57 10 -13 41 42 -14 47 6 -12 51 42 154 0 0 -14 8 49 11 7 18 59 282 -45 -14 16 32 -14 1 6 -15 6 22 -13 11 12 155 0 0 -14 27 47 11 7 30 58 282 -46 -14 35 29 -14 20 5 -15 25 14 -13 30 17 156 0 0 -14 46 21 11 7 41 57 282 -47 -14 54 2 -14 38 39 -15 43 40 -13 48 57 157 0 0 -15 4 29 11 7 52 56 282 -47 -15 12 9 -14 56 49 -16 1 42 -14 7 12 158 0 0 -15 22 12 11 8 2 55 281 -48 -15 29 52 -15 14 33 -16 19 19 -14 25 2 159 0 0 -15 39 30 11 8 13 54 281 -48 -15 47 9 -15 31 51 -16 36 30 -14 42 26 160 0 0 -15 56 23 11 8 23 53 281 -49 -16 4 1 -15 48 45 -16 53 16 -14 59 25 161 0 0 -16 12 50 11 8 34 52 281 -49 -16 20 27 -16 5 13 -17 9 37 -15 15 58 162 0 0 -16 28 51 11 8 44 51 281 -50 -16 36 27 -16 21 15 -17 25 32 -15 32 6 163 0 0 -16 44 27 11 8 53 50 281 -50 -16 52 2 -16 36 51 -17 41 1 -15 47 48 164 0 0 -16 59 36 11 9 3 49 280 -51 -17 7 11 -16 52 2 -17 56 5 -16 3 3 165 0 0 -17 14 20 11 9 13 48 280 -51 -17 21 54 -17 6 46 -18 10 43 -16 17 53 166 0 0 -17 28 38 11 9 22 47 280 -52 -17 36 11 -17 21 5 -18 24 55 -16 32 17 167 0 0 -17 42 30 11 9 31 46 280 -52 -17 50 2 -17 34 58 -18 38 41 -16 46 14 168 0 0 -17 55 56 11 9 40 45 279 -52 -18 3 27 -17 48 24 -18 52 2 -16 59 46 169 0 0 -18 8 55 11 9 49 44 279 -53 -18 16 26 -18 1 24 -19 4 56 -17 12 51 170 0 0 -18 21 29 11 9 57 43 279 -53 -18 28 59 -18 13 59 -19 17 24 -17 25 30 171 0 0 -18 33 36 11 10 6 42 278 -53 -18 41 5 -18 26 7 -19 29 26 -17 37 42 172 0 0 -18 45 17 11 10 14 41 278 -54 -18 52 46 -18 37 49 -19 41 3 -17 49 28 173 0 0 -18 56 33 11 10 22 40 278 -54 -19 4 1 -18 49 5 -19 52 13 -18 0 48 174 0 0 -19 7 22 11 10 29 39 278 -54 -19 14 49 -18 59 54 -20 2 58 -18 11 42 175 0 0 -19 17 45 11 10 37 38 277 -54 -19 25 11 -19 10 18 -20 13 16 -18 22 9 176 0 0 -19 27 41 11 10 44 37 277 -55 -19 35 7 -19 20 15 -20 23 8 -18 32 10 177 0 0 -19 37 12 11 10 52 36 277 -55 -19 44 38 -19 29 46 -20 32 35 -18 41 45 178 0 0 -19 46 17 11 10 59 35 276 -55 -19 53 42 -19 38 51 -20 41 36 -18 50 54 179 0 0 -19 54 55 11 11 6 34 276 -55 -20 2 20 -19 47 31 -20 50 10 -18 59 36 180 0 0 -20 3 8 11 11 12 33 276 -55 -20 10 32 -19 55 44 -20 58 19 -19 7 53 -179 0 0 -20 10 54 11 11 19 32 275 -55 -20 18 18 -20 3 31 -21 6 3 -19 15 43 -178 0 0 -20 18 15 11 11 25 31 275 -55 -20 25 38 -20 10 52 -21 13 20 -19 23 7 -177 0 0 -20 25 10 11 11 31 30 275 -55 -20 32 33 -20 17 47 -21 20 12 -19 30 5 -176 0 0 -20 31 39 11 11 37 29 274 -55 -20 39 1 -20 24 17 -21 26 38 -19 36 37 -175 0 0 -20 37 42 11 11 43 28 274 -55 -20 45 4 -20 30 20 -21 32 38 -19 42 43 -174 0 0 -20 43 20 11 11 48 27 274 -55 -20 50 41 -20 35 58 -21 38 13 -19 48 23 -173 0 0 -20 48 32 11 11 53 26 273 -55 -20 55 53 -20 41 10 -21 43 23 -19 53 37 -172 0 0 -20 53 18 11 11 59 25 273 -55 -21 0 39 -20 45 57 -21 48 7 -19 58 25 -171 0 0 -20 57 38 11 12 4 24 273 -55 -21 4 59 -20 50 17 -21 52 26 -20 2 48 -170 0 0 -21 1 33 11 12 8 23 272 -55 -21 8 54 -20 54 13 -21 56 19 -20 6 44 -169 0 0 -21 5 3 11 12 13 22 272 -55 -21 12 23 -20 57 42 -21 59 47 -20 10 16 -168 0 0 -21 8 7 11 12 17 21 272 -55 -21 15 27 -21 0 47 -22 2 50 -20 13 21 -167 0 0 -21 10 46 11 12 21 20 271 -55 -21 18 6 -21 3 26 -22 5 27 -20 16 1 -166 0 0 -21 12 59 11 12 25 19 271 -54 -21 20 19 -21 5 39 -22 7 40 -20 18 16 -165 0 0 -21 14 48 11 12 29 18 271 -54 -21 22 7 -21 7 28 -22 9 27 -20 20 5 -164 0 0 -21 16 11 11 12 33 18 270 -54 -21 23 30 -21 8 51 -22 10 49 -20 21 29 -163 0 0 -21 17 9 11 12 36 17 270 -54 -21 24 28 -21 9 49 -22 11 47 -20 22 27 -162 0 0 -21 17 41 11 12 40 16 269 -53 -21 25 1 -21 10 22 -22 12 19 -20 23 0 -161 0 0 -21 17 49 11 12 43 15 269 -53 -21 25 9 -21 10 30 -22 12 27 -20 23 8 -160 0 0 -21 17 32 11 12 45 14 269 -53 -21 24 52 -21 10 13 -22 12 10 -20 22 51 -159 0 0 -21 16 50 11 12 48 13 268 -52 -21 24 10 -21 9 31 -22 11 28 -20 22 9 -158 0 0 -21 15 43 11 12 51 12 268 -52 -21 23 3 -21 8 24 -22 10 22 -20 21 2 -157 0 0 -21 14 12 11 12 53 11 268 -52 -21 21 31 -21 6 52 -22 8 51 -20 19 29 -156 0 0 -21 12 15 11 12 55 10 267 -51 -21 19 35 -21 4 56 -22 6 55 -20 17 32 -155 0 0 -21 9 54 11 12 57 9 267 -51 -21 17 14 -21 2 34 -22 4 35 -20 15 10 -154 0 0 -21 7 9 11 12 59 8 267 -51 -21 14 29 -20 59 49 -22 1 51 -20 12 24 -153 0 0 -21 3 59 11 13 0 7 266 -50 -21 11 19 -20 56 38 -21 58 42 -20 9 12 -152 0 0 -21 0 24 11 13 2 6 266 -50 -21 7 45 -20 53 3 -21 55 9 -20 5 36 -151 0 0 -20 56 25 11 13 3 5 265 -49 -21 3 46 -20 49 4 -21 51 11 -20 1 36 -150 0 0 -20 52 2 11 13 4 4 265 -49 -20 59 23 -20 44 41 -21 46 50 -19 57 10 -149 0 0 -20 47 14 11 13 5 3 265 -48 -20 54 35 -20 39 53 -21 42 4 -19 52 21 -148 0 0 -20 42 2 11 13 5 2 264 -48 -20 49 24 -20 34 40 -21 36 54 -19 47 7 -147 0 0 -20 36 26 11 13 6 2 264 -47 -20 43 48 -20 29 4 -21 31 21 -19 41 28 -146 0 0 -20 30 26 11 13 6 1 264 -47 -20 37 48 -20 23 4 -21 25 23 -19 35 26 Uncertainty in time = +/- 12 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 5223-00631-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 58 24.6874 DE: -06 09 20.931 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .028 ) * V mag [mag]: 9.4 * B mag [mag]: 9.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4609) Pizarro approx. diameter [km]: 27 approx. diameter ["]: .016 distance from Earth [AU]: 2.32100 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 929 number of rejected observations: 17 time covered by the observations: 1978 May 06 - 2012 Oct 09 1 sigma uncertainty ellipse (major, minor, PA): 0.060, 0.036, 81° remarks: * orbital elements for (4609) Pizarro : Mean anomaly = 34.97806245 deg Arg. of pericenter = 116.09734572 deg Long. of node = 188.95233915 deg Inclination = 13.34647638 deg Eccentricity = 0.10721933 Semimajor axis = 3.10816484 AU Perihelion dist = 2.77490949 AU Mag: H = 11.65, G = 0.15 Epoch of elements : MJD 56230.45900000 TDT (2012 Oct 30.459) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 30 4609 Pizarro 11h 1.3m UT 9.4 21 58 24.687- 6 9 20.93TYC 5223-00631-1 9.9 16.6 27 3.0 2.321 1.181 -7.71 125.1120 -6.154 10.59 -13.99 11.0216 0.02263 0.05158 4.64606 -2.03734 0.00513 0.00165 2000 34.89550420121030.00000116.097346188.952339 13.3464760.10721933 3.1081648 2.774909511.5 5.00.15 RATE 1.7986550 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.046 82 4.23 0.052 0 0 4-1 056226.0020121030_0631-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org