IOTA/IOTA-ES occultation update for (2274) Ehrsson / TYC 1869-00537-1 event on 2012 Nov 20, 08:18 UT Visible from S Canada, N USA Summary ------- On 2012 Nov 20 UT, the 11 km diameter asteroid (2274) Ehrsson will occult a 10.2 mag star in the constellation Taurus for observers along a path across S Canada, N USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.4 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: 18 * date and approx. time of event: 2012 Nov 20, 08:07 - 2012 Nov 20, 08:30 UT * geocentric midpoint of event [JD]: 2456251.84602083 * magnitude of target star: 10.2 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 1.4 * Moon: 47 % sunlit, 119° distance * Sun: 153° distance * rough path description: S Canada, N USA The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 3.68 * 1 sigma uncertainty interval [seconds]: +/- 8.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .067 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .067", .037", 88° ) * approx speed of asteroid's shadow [km/s]: 7.8441 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1869-00537-1 by 2274 Ehrsson on 2012 Nov 20 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 156 0 0 22 8 8 8 30 54 1 61 -23 22 11 46 22 4 30 22 38 32 .. .. .. 157 0 0 22 39 23 8 30 54 2 61 -24 22 43 1 22 35 45 23 9 46 .. .. .. 158 0 0 23 10 30 8 30 53 3 62 -25 23 14 8 23 6 52 23 40 53 22 40 13 159 0 0 23 41 29 8 30 52 4 62 -26 23 45 7 23 37 51 24 11 52 23 11 13 160 0 0 24 12 19 8 30 51 5 63 -27 24 15 56 24 8 41 24 42 41 23 42 3 161 0 0 24 42 58 8 30 49 6 63 -28 24 46 36 24 39 21 25 13 20 24 12 43 162 0 0 25 13 28 8 30 48 7 63 -29 25 17 5 25 9 50 25 43 49 24 43 13 163 0 0 25 43 45 8 30 45 8 64 -30 25 47 23 25 40 8 26 14 5 25 13 32 164 0 0 26 13 51 8 30 43 9 64 -31 26 17 28 26 10 13 26 44 10 25 43 38 165 0 0 26 43 43 8 30 40 10 65 -32 26 47 20 26 40 6 27 14 1 26 13 32 166 0 0 27 13 22 8 30 38 11 65 -32 27 16 59 27 9 45 27 43 39 26 43 12 167 0 0 27 42 47 8 30 34 12 66 -33 27 46 24 27 39 10 28 13 2 27 12 39 168 0 0 28 11 57 8 30 31 13 66 -34 28 15 33 28 8 20 28 42 10 27 41 50 169 0 0 28 40 51 8 30 28 14 67 -35 28 44 28 28 37 15 29 11 3 28 10 46 170 0 0 29 9 30 8 30 24 15 67 -36 29 13 6 29 5 54 29 39 40 28 39 27 171 0 0 29 37 52 8 30 20 16 68 -37 29 41 28 29 34 16 30 8 0 29 7 51 172 0 0 30 5 57 8 30 15 17 68 -38 30 9 33 30 2 22 30 36 3 29 35 58 173 0 0 30 33 45 8 30 11 18 69 -39 30 37 20 30 30 9 31 3 48 30 3 48 174 0 0 31 1 14 8 30 6 19 69 -40 31 4 49 30 57 39 31 31 15 30 31 20 175 0 0 31 28 25 8 30 2 20 70 -40 31 32 0 31 24 50 31 58 24 30 58 33 176 0 0 31 55 17 8 29 57 21 70 -41 31 58 52 31 51 43 32 25 13 31 25 28 177 0 0 32 21 50 8 29 51 22 71 -42 32 25 24 32 18 16 32 51 43 31 52 3 178 0 0 32 48 3 8 29 46 23 72 -43 32 51 37 32 44 29 33 17 54 32 18 19 179 0 0 33 13 56 8 29 40 24 72 -44 33 17 30 33 10 23 33 43 44 32 44 15 180 0 0 33 39 29 8 29 35 25 73 -44 33 43 2 33 35 56 34 9 14 33 9 51 -179 0 0 34 4 41 8 29 29 25 73 -45 34 8 14 34 1 9 34 34 23 33 35 6 -178 0 0 34 29 33 8 29 23 26 74 -46 34 33 5 34 26 0 34 59 11 34 0 0 -177 0 0 34 54 3 8 29 17 27 75 -47 34 57 35 34 50 31 35 23 38 34 24 34 -176 0 0 35 18 12 8 29 10 28 75 -47 35 21 43 35 14 40 35 47 44 34 48 46 -175 0 0 35 41 59 8 29 4 29 76 -48 35 45 30 35 38 28 36 11 28 35 12 36 -174 0 0 36 5 24 8 28 57 30 77 -49 36 8 55 36 1 54 36 34 50 35 36 5 -173 0 0 36 28 28 8 28 50 31 77 -50 36 31 58 36 24 58 36 57 50 35 59 12 -172 0 0 36 51 9 8 28 44 31 78 -50 36 54 39 36 47 39 37 20 28 36 21 57 -171 0 0 37 13 29 8 28 37 32 79 -51 37 16 58 37 9 59 37 42 44 36 44 19 -170 0 0 37 35 25 8 28 30 33 79 -52 37 38 55 37 31 56 38 4 37 37 6 20 -169 0 0 37 57 0 8 28 23 34 80 -52 38 0 28 37 53 31 38 26 8 37 27 58 -168 0 0 38 18 11 8 28 15 35 81 -53 38 21 40 38 14 43 38 47 16 37 49 13 -167 0 0 38 39 1 8 28 8 36 82 -53 38 42 28 38 35 33 39 8 1 38 10 6 -166 0 0 38 59 27 8 28 1 36 83 -54 39 2 54 38 56 0 39 28 24 38 30 36 -165 0 0 39 19 31 8 27 53 37 83 -55 39 22 58 39 16 4 39 48 24 38 50 43 -164 0 0 39 39 12 8 27 45 38 84 -55 39 42 38 39 35 45 40 8 2 39 10 28 -163 0 0 39 58 30 8 27 38 39 85 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92 0 0 47 49 12 8 17 19 68 199 -50 47 52 25 47 46 0 48 16 5 47 22 25 - 91 0 0 47 44 3 8 17 10 68 202 -49 47 47 16 47 40 51 48 10 57 47 17 15 - 90 0 0 47 38 35 8 17 1 68 204 -49 47 41 48 47 35 22 48 5 30 47 11 44 - 89 0 0 47 32 46 8 16 51 68 206 -48 47 36 0 47 29 33 47 59 43 47 5 54 - 88 0 0 47 26 39 8 16 42 68 208 -48 47 29 52 47 23 25 47 53 37 46 59 45 - 87 0 0 47 20 11 8 16 33 67 211 -47 47 23 25 47 16 57 47 47 12 46 53 15 - 86 0 0 47 13 24 8 16 23 67 213 -47 47 16 37 47 10 10 47 40 26 46 46 26 - 85 0 0 47 6 16 8 16 14 67 215 -46 47 9 30 47 3 2 47 33 21 46 39 16 - 84 0 0 46 58 49 8 16 5 67 217 -45 47 2 3 46 55 35 47 25 56 46 31 47 - 83 0 0 46 51 2 8 15 55 66 219 -45 46 54 17 46 47 47 47 18 11 46 23 58 - 82 0 0 46 42 55 8 15 46 66 221 -44 46 46 9 46 39 40 47 10 6 46 15 48 - 81 0 0 46 34 27 8 15 37 66 223 -44 46 37 42 46 31 12 47 1 41 46 7 18 - 80 0 0 46 25 39 8 15 27 65 225 -43 46 28 55 46 22 24 46 52 56 45 58 28 - 79 0 0 46 16 31 8 15 18 65 227 -43 46 19 47 46 13 15 46 43 50 45 49 17 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43 17 38 8 12 55 58 252 -33 43 20 59 43 14 17 43 45 43 42 49 39 - 63 0 0 43 2 51 8 12 46 57 253 -32 43 6 13 42 59 30 43 30 59 42 34 49 - 62 0 0 42 47 42 8 12 36 56 254 -32 42 51 4 42 44 20 43 15 54 42 19 37 - 61 0 0 42 32 11 8 12 27 56 256 -31 42 35 34 42 28 49 43 0 26 42 4 2 - 60 0 0 42 16 19 8 12 17 55 257 -30 42 19 41 42 12 56 42 44 37 41 48 6 - 59 0 0 42 0 4 8 12 8 55 258 -29 42 3 27 41 56 40 42 28 26 41 31 47 - 58 0 0 41 43 27 8 11 58 54 259 -29 41 46 50 41 40 3 42 11 52 41 15 7 - 57 0 0 41 26 27 8 11 49 53 260 -28 41 29 51 41 23 3 41 54 56 40 58 4 - 56 0 0 41 9 6 8 11 39 53 262 -27 41 12 30 41 5 41 41 37 38 40 40 39 - 55 0 0 40 51 22 8 11 30 52 263 -27 40 54 47 40 47 57 41 19 58 40 22 52 - 54 0 0 40 33 16 8 11 20 51 264 -26 40 36 42 40 29 51 41 1 56 40 4 42 - 53 0 0 40 14 48 8 11 11 50 265 -25 40 18 14 40 11 22 40 43 31 39 46 11 - 52 0 0 39 55 57 8 11 2 50 266 -24 39 59 24 39 52 31 40 24 44 39 27 17 - 51 0 0 39 36 45 8 10 52 49 267 -24 39 40 11 39 33 18 40 5 35 39 8 0 - 50 0 0 39 17 10 8 10 43 48 268 -23 39 20 37 39 13 43 39 46 4 38 48 22 - 49 0 0 38 57 13 8 10 34 48 269 -22 39 0 40 38 53 45 39 26 10 38 28 21 - 48 0 0 38 36 53 8 10 25 47 270 -21 38 40 21 38 33 25 39 5 54 38 7 58 - 47 0 0 38 16 12 8 10 15 46 271 -20 38 19 40 38 12 43 38 45 16 37 47 13 - 46 0 0 37 55 8 8 10 6 45 272 -20 37 58 37 37 51 40 38 24 16 37 26 6 - 45 0 0 37 33 43 8 9 57 45 273 -19 37 37 12 37 30 14 38 2 54 37 4 38 - 44 0 0 37 11 55 8 9 48 44 274 -18 37 15 25 37 8 26 37 41 10 36 42 47 - 43 0 0 36 49 46 8 9 39 43 275 -17 36 53 16 36 46 16 37 19 5 36 20 34 - 42 0 0 36 27 16 8 9 30 42 275 -16 36 30 46 36 23 45 36 56 37 35 58 1 - 41 0 0 36 4 24 8 9 22 41 276 -15 36 7 54 36 0 53 36 33 48 35 35 5 - 40 0 0 35 41 10 8 9 13 41 277 -15 35 44 41 35 37 39 36 10 38 35 11 49 - 39 0 0 35 17 36 8 9 4 40 278 -14 35 21 7 35 14 4 35 47 7 34 48 11 - 38 0 0 34 53 40 8 8 56 39 279 -13 34 57 12 34 50 8 35 23 14 34 24 13 - 37 0 0 34 29 24 8 8 47 38 279 -12 34 32 56 34 25 52 34 59 1 33 59 53 - 36 0 0 34 4 47 8 8 39 37 280 -11 34 8 20 34 1 15 34 34 27 33 35 14 - 35 0 0 33 39 51 8 8 31 36 281 -10 33 43 24 33 36 18 34 9 34 33 10 14 - 34 0 0 33 14 34 8 8 23 35 282 -9 33 18 7 33 11 1 33 44 20 32 44 55 - 33 0 0 32 48 58 8 8 15 35 282 -8 32 52 31 32 45 24 33 18 46 32 19 16 - 32 0 0 32 23 2 8 8 7 34 283 -8 32 26 36 32 19 28 32 52 53 31 53 18 - 31 0 0 31 56 47 8 7 59 33 284 -7 32 0 22 31 53 13 32 26 41 31 27 1 - 30 0 0 31 30 14 8 7 51 32 284 -6 31 33 49 31 26 40 32 0 10 31 0 25 - 29 0 0 31 3 23 8 7 44 31 285 -5 31 6 58 30 59 48 31 33 21 30 33 31 - 28 0 0 30 36 14 8 7 36 30 286 -4 30 39 49 30 32 39 31 6 14 30 6 20 - 27 0 0 30 8 47 8 7 29 29 286 -3 30 12 22 30 5 12 30 38 50 29 38 52 - 26 0 0 29 41 4 8 7 22 28 287 -2 29 44 39 29 37 28 30 11 8 29 11 6 - 25 0 0 29 13 4 8 7 15 27 287 -1 29 16 40 29 9 28 29 43 10 28 43 4 Uncertainty in time = +/- 9 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1869-00537-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 36 27.1183 DE: +26 59 20.850 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .019 ) * V mag [mag]: 10.2 * B mag [mag]: 11.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2274) Ehrsson approx. diameter [km]: 11 approx. diameter ["]: .010 distance from Earth [AU]: 1.46600 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1165 number of rejected observations: 19 time covered by the observations: 1976 Mar 02 - 2012 Nov 05 1 sigma uncertainty ellipse (major, minor, PA): 0.063, 0.031, 88° remarks: * orbital elements for (2274) Ehrsson : Mean anomaly = 285.31586391 deg Arg. of pericenter = 186.89182303 deg Long. of node = 348.33619865 deg Inclination = 2.24775153 deg Eccentricity = 0.22930327 Semimajor axis = 2.41066621 AU Perihelion dist = 1.85789255 AU Mag: H = 12.44, G = 0.15 Epoch of elements : MJD 56251.34600000 TDT (2012 Nov 20.346) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 20 2274 Ehrsson 8h 18.3m UT 10.2 5 36 27.118 26 59 20.85TYC 1869-00537-1 11.0 15.8 11 1.4 1.466 -1.986 1.54 -100.2082 26.989 51.86 -19.81 8.3045 0.02062 0.35862 -4.41993 0.25710 -0.00251 -0.00043 2000 284.96142320121119.00000186.891823348.336199 2.2477520.22930327 2.4106662 1.857892612.4 5.00.15 RATE 2.6332890 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.067 0.037 88 4.68 0.038 0 0 3 0 056247.0020121120_0537-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org