IOTA/IOTA-ES occultation update for (702) Alauda / TYC 7367-00378-1 event on 2012 Jul 11, 23:35 UT Visible from NE Brazil Summary ------- On 2012 Jul 11 UT, the 219 km diameter asteroid (702) Alauda will occult a 10.9 mag star in the constellation Scorpius for observers along a path across NE Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 12.2 mag (the magnitude of the asteroid) for at most 18.6 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: 2012 Jul 11, 23:26 - 2012 Jul 11, 23:43 UT * geocentric midpoint of event [JD]: 2456120.4829125 * magnitude of target star: 10.9 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 18.6 * Moon: 41 % sunlit, 133° distance * Sun: 145° distance * rough path description: NE Brazil The occultation path -------------------- * approximate projected width [km]: 226 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .027", 87° ) * approx speed of asteroid's shadow [km/s]: 11.7982 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7367-00378-1 by 702 Alauda on 2012 Jul 11 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 - 64 49 37 40 0 0 23 43 58 10 153 0 - 63 17 34 - 66 21 56 - 62 37 8 - 67 2 40 - 64 5 33 39 0 0 23 43 56 11 154 -1 - 62 34 54 - 65 36 26 - 61 55 5 - 66 16 31 - 63 22 19 38 0 0 23 43 54 12 154 -2 - 61 52 59 - 64 51 50 - 61 13 44 - 65 31 19 - 62 39 51 37 0 0 23 43 52 13 154 -3 - 61 11 45 - 64 8 6 - 60 33 2 - 64 46 59 - 61 58 4 36 0 0 23 43 49 14 155 -4 - 60 31 9 - 63 25 7 - 59 52 56 - 64 3 29 - 61 16 56 35 0 0 23 43 46 16 155 -5 - 59 51 7 - 62 42 51 - 59 13 23 - 63 20 42 - 60 36 23 34 0 0 23 43 43 17 156 -6 - 59 11 36 - 62 1 14 - 58 34 19 - 62 38 37 - 59 56 22 33 0 0 23 43 40 18 156 -7 - 58 32 34 - 61 20 13 - 57 55 41 - 61 57 9 - 59 16 50 32 0 0 23 43 36 19 156 -8 - 57 53 57 - 60 39 45 - 57 17 28 - 61 16 15 - 58 37 44 31 0 0 23 43 33 20 157 -9 - 57 15 43 - 59 59 46 - 56 39 37 - 60 35 53 - 57 59 3 30 0 0 23 43 29 21 157 -10 - 56 37 50 - 59 20 14 - 56 2 5 - 59 55 58 - 57 20 42 29 0 0 23 43 25 22 158 -11 - 56 0 15 - 58 41 7 - 55 24 50 - 59 16 30 - 56 42 41 28 0 0 23 43 20 23 158 -12 - 55 22 57 - 58 2 22 - 54 47 50 - 58 37 25 - 56 4 57 27 0 0 23 43 16 25 158 -13 - 54 45 53 - 57 23 56 - 54 11 3 - 57 58 41 - 55 27 27 26 0 0 23 43 11 26 159 -14 - 54 9 1 - 56 45 48 - 53 34 27 - 57 20 16 - 54 50 10 25 0 0 23 43 6 27 159 -15 - 53 32 19 - 56 7 56 - 52 58 1 - 56 42 7 - 54 13 5 24 0 0 23 43 1 28 159 -16 - 52 55 46 - 55 30 16 - 52 21 41 - 56 4 13 - 53 36 8 23 0 0 23 42 56 29 160 -17 - 52 19 19 - 54 52 49 - 51 45 28 - 55 26 31 - 52 59 19 22 0 0 23 42 51 30 160 -18 - 51 42 58 - 54 15 30 - 51 9 18 - 54 49 0 - 52 22 35 21 0 0 23 42 45 31 160 -19 - 51 6 39 - 53 38 20 - 50 33 11 - 54 11 37 - 51 45 55 20 0 0 23 42 39 32 160 -20 - 50 30 23 - 53 1 16 - 49 57 5 - 53 34 22 - 51 9 18 19 0 0 23 42 33 34 161 -21 - 49 54 7 - 52 24 16 - 49 20 58 - 52 57 12 - 50 32 41 18 0 0 23 42 27 35 161 -22 - 49 17 50 - 51 47 19 - 48 44 49 - 52 20 6 - 49 56 3 17 0 0 23 42 21 36 161 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11 37 - 41 47 13 4 0 0 23 40 41 50 166 -36 - 40 33 29 - 43 0 32 - 40 0 53 - 43 32 40 - 41 7 45 3 0 0 23 40 32 51 167 -37 - 39 53 50 - 42 21 12 - 39 21 10 - 42 53 24 - 40 27 52 2 0 0 23 40 23 53 167 -38 - 39 13 46 - 41 41 30 - 38 41 0 - 42 13 46 - 39 47 34 1 0 0 23 40 14 54 168 -40 - 38 33 14 - 41 1 25 - 38 0 21 - 41 33 45 - 39 6 48 0 0 0 23 40 5 55 169 -41 - 37 52 11 - 40 20 53 - 37 19 11 - 40 53 20 - 38 25 32 - 1 0 0 23 39 55 56 169 -42 - 37 10 37 - 39 39 54 - 36 37 28 - 40 12 28 Latitude Latitude Latitude Latitude - 38 0 0 - 1 36 44 23 39 49 57 170 -42 0 11 22 - 3 23 14 0 59 29 - 4 9 37 - 37 0 0 - 3 1 55 23 39 35 58 171 -44 - 1 15 12 - 4 47 7 - 0 27 42 - 5 32 57 - 36 0 0 - 4 25 26 23 39 21 60 172 -45 - 2 40 4 - 6 9 20 - 1 53 12 - 6 54 37 - 35 0 0 - 5 47 14 23 39 7 61 173 -47 - 4 3 13 - 7 29 50 - 3 16 58 - 8 14 34 - 34 0 0 - 7 7 16 23 38 53 62 174 -48 - 5 24 36 - 8 48 36 - 4 38 57 - 9 32 48 - 33 0 0 - 8 25 32 23 38 40 64 176 -49 - 6 44 11 -10 5 36 - 5 59 9 -10 49 15 - 32 0 0 - 9 42 0 23 38 26 65 177 -51 - 8 1 58 -11 20 49 - 7 17 31 -12 3 56 - 31 0 0 -10 56 39 23 38 12 66 179 -52 - 9 17 54 -12 34 14 - 8 34 3 -13 16 49 - 30 0 0 -12 9 30 23 37 58 68 181 -53 -10 32 1 -13 45 51 - 9 48 44 -14 27 55 - 29 0 0 -13 20 31 23 37 45 69 184 -55 -11 44 17 -14 55 40 -11 1 34 -15 37 14 - 28 0 0 -14 29 43 23 37 31 70 186 -56 -12 54 43 -16 3 42 -12 12 33 -16 44 45 - 27 0 0 -15 37 7 23 37 18 71 189 -57 -14 3 19 -17 9 57 -13 21 42 -17 50 30 - 26 0 0 -16 42 44 23 37 5 72 192 -58 -15 10 6 -18 14 25 -14 29 1 -18 54 29 - 25 0 0 -17 46 34 23 36 52 73 195 -59 -16 15 5 -19 17 8 -15 34 31 -19 56 43 - 24 0 0 -18 48 38 23 36 39 73 198 -61 -17 18 17 -20 18 7 -16 38 13 -20 57 14 - 23 0 0 -19 48 58 23 36 27 74 202 -62 -18 19 43 -21 17 23 -17 40 9 -21 56 3 - 22 0 0 -20 47 36 23 36 15 74 206 -63 -19 19 25 -22 14 58 -18 40 21 -22 53 10 - 21 0 0 -21 44 32 23 36 2 75 210 -64 -20 17 24 -23 10 53 -19 38 48 -23 48 39 - 20 0 0 -22 39 49 23 35 50 75 214 -65 -21 13 43 -24 5 10 -20 35 34 -24 42 30 - 19 0 0 -23 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49 21 23 29 5 42 259 -60 -42 48 8 -44 50 16 -42 21 6 -45 17 0 35 0 0 -43 50 39 23 29 1 41 258 -59 -42 49 27 -44 51 33 -42 22 26 -45 18 16 36 0 0 -43 51 18 23 28 56 40 258 -59 -42 50 7 -44 52 12 -42 23 6 -45 18 54 37 0 0 -43 51 19 23 28 52 40 257 -58 -42 50 8 -44 52 13 -42 23 7 -45 18 56 38 0 0 -43 50 42 23 28 47 39 257 -58 -42 49 29 -44 51 37 -42 22 28 -45 18 20 39 0 0 -43 49 26 23 28 43 38 256 -57 -42 48 11 -44 50 23 -42 21 9 -45 17 6 40 0 0 -43 47 31 23 28 39 38 255 -56 -42 46 14 -44 48 31 -42 19 10 -45 15 16 41 0 0 -43 44 58 23 28 34 37 255 -56 -42 43 37 -44 46 1 -42 16 32 -45 12 48 42 0 0 -43 41 46 23 28 30 36 254 -55 -42 40 21 -44 42 53 -42 13 13 -45 9 42 43 0 0 -43 37 55 23 28 26 35 254 -55 -42 36 24 -44 39 7 -42 9 15 -45 5 58 44 0 0 -43 33 24 23 28 22 35 253 -54 -42 31 48 -44 34 42 -42 4 35 -45 1 36 45 0 0 -43 28 14 23 28 18 34 253 -53 -42 26 30 -44 29 39 -41 59 15 -44 56 35 46 0 0 -43 22 23 23 28 14 33 252 -53 -42 20 32 -44 23 56 -41 53 13 -44 50 56 47 0 0 -43 15 53 23 28 10 33 251 -52 -42 13 53 -44 17 34 -41 46 30 -44 44 37 48 0 0 -43 8 41 23 28 7 32 251 -52 -42 6 32 -44 10 32 -41 39 5 -44 37 40 49 0 0 -43 0 49 23 28 3 31 250 -51 -41 58 29 -44 2 50 -41 30 57 -44 30 2 50 0 0 -42 52 15 23 27 59 30 250 -50 -41 49 44 -43 54 27 -41 22 7 -44 21 44 51 0 0 -42 42 59 23 27 56 30 249 -50 -41 40 15 -43 45 23 -41 12 33 -44 12 45 52 0 0 -42 33 0 23 27 52 29 248 -49 -41 30 3 -43 35 37 -41 2 15 -44 3 4 53 0 0 -42 22 17 23 27 48 28 248 -48 -41 19 7 -43 25 9 -40 51 12 -43 52 42 54 0 0 -42 10 51 23 27 45 28 247 -48 -41 7 25 -43 13 57 -40 39 24 -43 41 37 55 0 0 -41 58 40 23 27 42 27 247 -47 -40 54 58 -43 2 2 -40 26 50 -43 29 49 56 0 0 -41 45 44 23 27 38 26 246 -46 -40 41 45 -42 49 23 -40 13 29 -43 17 17 57 0 0 -41 32 2 23 27 35 25 245 -46 -40 27 45 -42 35 58 -39 59 21 -43 4 0 58 0 0 -41 17 32 23 27 32 24 245 -45 -40 12 56 -42 21 47 -39 44 23 -42 49 57 59 0 0 -41 2 15 23 27 29 24 244 -44 -39 57 19 -42 6 49 -39 28 37 -42 35 8 60 0 0 -40 46 8 23 27 26 23 244 -44 -39 40 51 -41 51 4 -39 12 0 -42 19 32 61 0 0 -40 29 12 23 27 23 22 243 -43 -39 23 33 -41 34 30 -38 54 32 -42 3 7 62 0 0 -40 11 25 23 27 20 21 242 -42 -39 5 22 -41 17 6 -38 36 11 -41 45 53 63 0 0 -39 52 46 23 27 17 20 242 -42 -38 46 19 -40 58 51 -38 16 56 -41 27 49 64 0 0 -39 33 14 23 27 14 20 241 -41 -38 26 21 -40 39 44 -37 56 47 -41 8 53 65 0 0 -39 12 48 23 27 11 19 241 -40 -38 5 27 -40 19 44 -37 35 41 -40 49 4 66 0 0 -38 51 26 23 27 9 18 240 -39 -37 43 37 -39 58 50 -37 13 38 -40 28 22 67 0 0 -38 29 6 23 27 6 17 239 -39 -37 20 48 -39 36 59 -36 50 37 -40 6 44 68 0 0 -38 5 49 23 27 4 16 239 -38 -36 57 0 -39 14 12 -36 26 34 -39 44 9 69 0 0 -37 41 31 23 27 1 15 238 -37 -36 32 10 -38 50 26 -36 1 30 -39 20 37 70 0 0 -37 16 12 23 26 59 15 238 -36 -36 6 17 -38 25 39 -35 35 23 -38 56 5 71 0 0 -36 49 50 23 26 57 14 237 -35 -35 39 20 -37 59 51 -35 8 10 -38 30 31 72 0 0 -36 22 22 23 26 55 13 236 -35 -35 11 17 -37 32 59 -34 39 50 -38 3 55 73 0 0 -35 53 49 23 26 53 12 236 -34 -34 42 5 -37 5 3 -34 10 22 -37 36 14 74 0 0 -35 24 6 23 26 51 11 235 -33 -34 11 44 -36 35 59 -33 39 42 -37 7 27 75 0 0 -34 53 14 23 26 49 10 235 -32 -33 40 10 -36 5 46 -33 7 50 -36 37 32 76 0 0 -34 21 9 23 26 48 9 234 -31 -33 7 22 -35 34 23 -32 34 44 -36 6 27 77 0 0 -33 47 49 23 26 46 8 234 -30 -32 33 18 -35 1 46 -32 0 20 -35 34 9 78 0 0 -33 13 12 23 26 45 7 233 -29 -31 57 56 -34 27 55 -31 24 37 -35 0 37 79 0 0 -32 37 17 23 26 44 6 233 -28 -31 21 13 -33 52 46 -30 47 32 -34 25 48 80 0 0 -32 0 0 23 26 43 5 232 -28 -30 43 6 -33 16 17 -30 9 4 -33 49 40 81 0 0 -31 21 19 23 26 42 4 232 -27 -30 3 34 -32 38 27 -29 29 8 -33 12 12 82 0 0 -30 41 12 23 26 42 3 231 -26 -29 22 33 -31 59 12 -28 47 44 -32 33 19 83 0 0 -29 59 36 23 26 41 2 231 -25 -28 40 2 -31 18 30 -28 4 47 -31 53 1 84 0 0 -29 16 29 23 26 41 0 230 -24 .. .. .. -30 36 18 .. .. .. -31 11 13 Uncertainty in time = +/- 4 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 7367-00378-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 55 45.9303 DE: -34 24 04.100 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .025 ) * V mag [mag]: 10.9 * B mag [mag]: 12.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (702) Alauda approx. diameter [km]: 219 approx. diameter ["]: .135 distance from Earth [AU]: 2.24500 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1235 number of rejected observations: 73 time covered by the observations: 1910 Jul 17 - 2012 Jul 03 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.009, 79° remarks: * orbital elements for (702) Alauda : Mean anomaly = 343.10367279 deg Arg. of pericenter = 353.18251372 deg Long. of node = 289.93321855 deg Inclination = 20.60747763 deg Eccentricity = 0.02052383 Semimajor axis = 3.19437345 AU Perihelion dist = 3.12881267 AU Mag: H = 7.26, G = 0.15 Epoch of elements : MJD 56119.98300000 TDT (2012 Jul 11.983) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 11 702 Alauda 23h 35.4m UT 10.9 16 55 45.930-34 24 4.10TYC 7367-00378-1 12.4 12.2 219 18.6 2.245 -1.345 20.07 -30.1850 -34.407 -172.44 21.94 23.5899 0.19323 0.15980 -4.25254 5.12456 0.00316 0.00061 2000 341.3802712012 7 2.00000353.182514289.933219 20.6074780.02052383 3.1943735 3.1288127 7.3 5.00.15 RATE 1.7263370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.027 87 1.22 0.029 1 6 900 0 3 0 056116.0020120711_0378-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 21:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org