IOTA/IOTA-ES occultation update for (770) Bali / TYC 5816-00292-1 event on 2012 Nov 26, 04:59 UT Visible from W USA Summary ------- On 2012 Nov 26 UT, the 16 km diameter asteroid (770) Bali will occult a 9.2 mag star in the constellation Aquarius for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 14.7 mag (the magnitude of the asteroid) for at most 1.1 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: 35 * date and approx. time of event: 2012 Nov 26, 04:59 - 2012 Nov 26, 05:06 UT * geocentric midpoint of event [JD]: 2456257.70793333 * magnitude of target star: 9.2 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.1 * Moon: 95 % sunlit, 59° distance * Sun: 96° distance * rough path description: W USA The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 1.88 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .026", 81° ) * approx speed of asteroid's shadow [km/s]: 15.1192 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5816-00292-1 by 770 Bali on 2012 Nov 26 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 -169 0 0 3 56 53 4 59 4 71 140 0 3 51 32 4 2 15 3 31 25 4 22 25 -168 0 0 4 33 44 4 59 13 71 143 -2 4 28 22 4 39 7 4 8 11 4 59 22 -167 0 0 5 11 2 4 59 21 72 147 -3 5 5 38 5 16 26 4 45 24 5 36 45 -166 0 0 5 48 45 4 59 30 72 151 -4 5 43 21 5 54 10 5 23 2 6 14 33 -165 0 0 6 26 53 4 59 39 71 155 -5 6 21 27 6 32 18 6 1 4 6 52 45 -164 0 0 7 5 23 4 59 48 71 158 -6 6 59 57 7 10 50 6 39 30 7 31 21 -163 0 0 7 44 16 4 59 57 71 162 -8 7 38 48 7 49 44 7 18 18 8 10 18 -162 0 0 8 23 29 5 0 6 71 165 -9 8 18 0 8 28 58 7 57 27 8 49 36 -161 0 0 9 3 1 5 0 15 70 169 -10 8 57 32 9 8 31 8 36 55 9 29 12 -160 0 0 9 42 51 5 0 24 70 172 -11 9 37 21 9 48 22 9 16 40 10 9 7 -159 0 0 10 22 58 5 0 33 69 175 -12 10 17 26 10 28 29 9 56 43 10 49 17 -158 0 0 11 3 19 5 0 41 69 178 -13 10 57 47 11 8 51 10 37 0 11 29 42 -157 0 0 11 43 53 5 0 50 68 181 -15 11 38 21 11 49 26 11 17 31 12 10 20 -156 0 0 12 24 40 5 0 59 67 183 -16 12 19 6 12 30 13 11 58 14 12 51 10 -155 0 0 13 5 36 5 1 8 66 186 -17 13 0 2 13 11 11 12 39 7 13 32 10 -154 0 0 13 46 41 5 1 16 66 188 -18 13 41 7 13 52 16 13 20 10 14 13 18 -153 0 0 14 27 53 5 1 25 65 190 -19 14 22 18 14 33 29 14 1 19 14 54 33 -152 0 0 15 9 11 5 1 33 64 192 -20 15 3 35 15 14 47 14 42 34 15 35 52 -151 0 0 15 50 32 5 1 42 63 194 -22 15 44 56 15 56 8 15 23 53 16 17 16 -150 0 0 16 31 55 5 1 50 62 196 -23 16 26 18 16 37 32 16 5 14 16 58 41 -149 0 0 17 13 18 5 1 58 61 198 -24 17 7 41 17 18 56 16 46 36 17 40 6 -148 0 0 17 54 41 5 2 6 60 199 -25 17 49 3 18 0 18 17 27 57 18 21 29 -147 0 0 18 36 0 5 2 14 59 201 -26 18 30 22 18 41 38 18 9 15 19 2 50 -146 0 0 19 17 14 5 2 22 58 202 -27 19 11 37 19 22 52 18 50 29 19 44 5 -145 0 0 19 58 23 5 2 30 57 204 -28 19 52 45 20 4 1 19 31 36 20 25 14 -144 0 0 20 39 23 5 2 38 56 205 -29 20 33 45 20 45 1 20 12 37 21 6 15 -143 0 0 21 20 14 5 2 45 55 206 -31 21 14 37 21 25 53 20 53 28 21 47 6 -142 0 0 22 0 55 5 2 53 54 207 -32 21 55 17 22 6 33 21 34 8 22 27 46 -141 0 0 22 41 22 5 3 0 53 208 -33 22 35 45 22 47 0 22 14 37 23 8 13 -140 0 0 23 21 36 5 3 7 52 210 -34 23 15 59 23 27 14 22 54 51 23 48 26 -139 0 0 24 1 35 5 3 14 51 211 -35 23 55 57 24 7 12 23 34 51 24 28 24 -138 0 0 24 41 16 5 3 21 50 212 -36 24 35 39 24 46 54 24 14 34 25 8 4 -137 0 0 25 20 40 5 3 28 49 212 -37 25 15 3 25 26 17 24 53 59 25 47 26 -136 0 0 25 59 44 5 3 34 48 213 -38 25 54 8 26 5 21 25 33 5 26 26 28 -135 0 0 26 38 28 5 3 41 47 214 -39 26 32 52 26 44 4 26 11 51 27 5 10 -134 0 0 27 16 50 5 3 47 46 215 -40 27 11 14 27 22 25 26 50 15 27 43 29 -133 0 0 27 54 49 5 3 53 45 216 -41 27 49 14 28 0 24 27 28 17 28 21 26 -132 0 0 28 32 24 5 3 59 44 217 -42 28 26 49 28 37 58 28 5 54 28 58 58 -131 0 0 29 9 34 5 4 5 43 218 -43 29 4 0 29 15 8 28 43 7 29 36 5 -130 0 0 29 46 18 5 4 10 42 218 -44 29 40 45 29 51 51 29 19 55 30 12 46 -129 0 0 30 22 35 5 4 16 41 219 -44 30 17 3 30 28 7 29 56 15 30 48 59 -128 0 0 30 58 24 5 4 21 40 220 -45 30 52 53 31 3 56 30 32 8 31 24 45 -127 0 0 31 33 46 5 4 26 39 221 -46 31 28 15 31 39 17 31 7 33 32 0 3 -126 0 0 32 8 38 5 4 31 38 222 -47 32 3 8 32 14 8 31 42 29 32 34 51 -125 0 0 32 43 0 5 4 36 37 222 -48 32 37 31 32 48 29 32 16 56 33 9 9 -124 0 0 33 16 52 5 4 41 36 223 -49 33 11 24 33 22 20 32 50 52 33 42 56 -123 0 0 33 50 13 5 4 45 35 224 -49 33 44 45 33 55 40 33 24 17 34 16 12 -122 0 0 34 23 2 5 4 50 34 224 -50 34 17 36 34 28 28 33 57 11 34 48 57 -121 0 0 34 55 20 5 4 54 33 225 -51 34 49 55 35 0 45 34 29 34 35 21 10 -120 0 0 35 27 5 5 4 58 32 226 -52 35 21 41 35 32 30 35 1 24 35 52 51 -119 0 0 35 58 18 5 5 2 31 227 -52 35 52 55 36 3 42 35 32 42 36 23 59 -118 0 0 36 28 58 5 5 6 30 227 -53 36 23 36 36 34 21 36 3 27 36 54 34 -117 0 0 36 59 6 5 5 9 29 228 -54 36 53 45 37 4 27 36 33 39 37 24 36 -116 0 0 37 28 40 5 5 13 28 229 -54 37 23 20 37 34 0 37 3 18 37 54 5 -115 0 0 37 57 40 5 5 16 27 229 -55 37 52 21 38 2 59 37 32 24 38 23 0 -114 0 0 38 26 7 5 5 19 26 230 -56 38 20 50 38 31 25 38 0 57 38 51 22 -113 0 0 38 54 1 5 5 22 25 231 -56 38 48 44 38 59 18 38 28 56 39 19 10 -112 0 0 39 21 21 5 5 25 24 232 -57 39 16 5 39 26 37 38 56 21 39 46 25 -111 0 0 39 48 7 5 5 28 23 232 -57 39 42 53 39 53 22 39 23 13 40 13 6 -110 0 0 40 14 20 5 5 31 23 233 -58 40 9 7 40 19 34 39 49 31 40 39 13 -109 0 0 40 40 0 5 5 33 22 234 -58 40 34 48 40 45 12 40 15 16 41 4 47 -108 0 0 41 5 6 5 5 36 21 234 -59 40 59 55 41 10 17 40 40 28 41 29 48 -107 0 0 41 29 39 5 5 38 20 235 -59 41 24 29 41 34 49 41 5 6 41 54 16 -106 0 0 41 53 39 5 5 40 19 236 -59 41 48 30 41 58 48 41 29 12 42 18 10 -105 0 0 42 17 6 5 5 42 18 236 -60 42 11 58 42 22 13 41 52 44 42 41 31 -104 0 0 42 40 0 5 5 44 17 237 -60 42 34 54 42 45 6 42 15 44 43 4 20 -103 0 0 43 2 22 5 5 46 17 238 -61 42 57 17 43 7 27 42 38 11 43 26 36 -102 0 0 43 24 11 5 5 48 16 239 -61 43 19 7 43 29 15 43 0 5 43 48 20 -101 0 0 43 45 28 5 5 50 15 239 -61 43 40 25 43 50 31 43 21 28 44 9 32 -100 0 0 44 6 13 5 5 51 14 240 -61 44 1 12 44 11 15 43 42 18 44 30 12 - 99 0 0 44 26 27 5 5 53 13 241 -62 44 21 26 44 31 28 44 2 37 44 50 20 - 98 0 0 44 46 9 5 5 54 13 241 -62 44 41 10 44 51 9 44 22 25 45 9 58 - 97 0 0 45 5 21 5 5 55 12 242 -62 45 0 22 45 10 19 44 41 41 45 29 4 - 96 0 0 45 24 1 5 5 57 11 243 -62 45 19 4 45 28 59 45 0 26 45 47 39 - 95 0 0 45 42 11 5 5 58 10 244 -62 45 37 14 45 47 8 45 18 41 46 5 44 - 94 0 0 45 59 51 5 5 59 9 244 -62 45 54 55 46 4 46 45 36 26 46 23 19 - 93 0 0 46 17 0 5 6 0 9 245 -62 46 12 6 46 21 55 45 53 40 46 40 24 - 92 0 0 46 33 40 5 6 0 8 246 -63 46 28 47 46 38 34 46 10 25 46 56 59 - 91 0 0 46 49 51 5 6 1 7 247 -63 46 44 59 46 54 44 46 26 40 47 13 5 - 90 0 0 47 5 33 5 6 2 7 247 -63 47 0 41 47 10 24 46 42 26 47 28 42 - 89 0 0 47 20 45 5 6 3 6 248 -63 47 15 55 47 25 36 46 57 44 47 43 50 - 88 0 0 47 35 30 5 6 3 5 249 -63 47 30 40 47 40 20 47 12 32 47 58 30 - 87 0 0 47 49 46 5 6 3 4 249 -63 47 44 57 47 54 35 47 26 53 48 12 42 - 86 0 0 48 3 34 5 6 4 4 250 -62 47 58 46 48 8 22 47 40 45 48 26 27 - 85 0 0 48 16 55 5 6 4 3 251 -62 48 12 8 48 21 42 47 54 10 48 39 43 - 84 0 0 48 29 48 5 6 4 2 252 -62 48 25 2 48 34 35 48 7 7 48 52 32 - 83 0 0 48 42 15 5 6 5 2 252 -62 48 37 29 48 47 0 48 19 37 49 4 55 - 82 0 0 48 54 14 5 6 5 1 253 -62 48 49 29 48 58 59 48 31 40 49 16 51 - 81 0 0 49 5 47 5 6 5 0 254 -62 49 1 3 49 10 31 48 43 17 49 28 20 Uncertainty in time = +/- 2 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 5816-00292-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 53 00.3758 DE: -10 25 50.876 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .024 ) * V mag [mag]: 9.2 * B mag [mag]: 9.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (770) Bali approx. diameter [km]: 16 approx. diameter ["]: .014 distance from Earth [AU]: 1.62000 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1180 number of rejected observations: 89 time covered by the observations: 1903 Oct 20 - 2012 Oct 27 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.010, 65° remarks: * orbital elements for (770) Bali : Mean anomaly = 320.05527381 deg Arg. of pericenter = 18.13122091 deg Long. of node = 44.72699544 deg Inclination = 4.38642509 deg Eccentricity = 0.15073972 Semimajor axis = 2.22074014 AU Perihelion dist = 1.88598639 AU Mag: H = 10.87, G = 0.15 Epoch of elements : MJD 56257.20800000 TDT (2012 Nov 26.208) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 26 770 Bali 4h 59.4m UT 9.2 22 53 0.376-10 25 50.88TYC 5816-00292-1 9.7 14.7 16 1.1 1.620 2.676 24.25 -157.1364 -10.437 101.99 -21.01 4.9904 -0.16569 0.26966 7.27086 4.46751 0.00495 0.00208 2000 317.90857020121119.00000 18.131221 44.726995 4.3864250.15073972 2.2207401 1.885986410.9 5.00.15 RATE 2.9782240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.026 81 2.88 0.026 0 0-2 4 056247.0020121126_0292-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org