IOTA/IOTA-ES occultation update for (2810) Lev Tolstoj / TYC 0097-01073-1 event on 2012 Nov 07, 22:29 UT Visible from Russia, SW Asia, Arabia, Africa Summary ------- On 2012 Nov 07 UT, the 10 km diameter asteroid (2810) Lev Tolstoj will occult a 10.5 mag star in the constellation Orion for observers along a path across Russia, SW Asia, Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.8 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 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: 7 * date and approx. time of event: 2012 Nov 07, 22:16 - 2012 Nov 07, 22:41 UT * geocentric midpoint of event [JD]: 2456239.43684583 * magnitude of target star: 10.5 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.2 * Moon: 41 % sunlit, 71° distance * Sun: 147° distance * rough path description: Russia, SW Asia, Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 8.74 * 1 sigma uncertainty interval [seconds]: +/- 9.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .099 +/- .066) * 1 sigma uncertainty ellipse (major, minor, PA): ( .099", .066", 89° ) * approx speed of asteroid's shadow [km/s]: 8.1921 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0097-01073-1 by 2810 Lev Tolstoj on 2012 Nov 7 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 - 35 33 20 -42 0 0 22 41 49 1 80 -15 - 35 55 5 - 35 12 11 ... .. .. - 30 6 55 - 29 25 46 -41 0 0 22 41 46 6 76 -19 - 29 40 9 - 29 11 34 - 34 30 24 - 25 26 9 Latitude Latitude Latitude Latitude - 29 0 0 -40 54 50 22 41 45 6 76 -19 -40 52 1 -40 57 40 -40 2 29 -41 47 4 - 28 0 0 -40 42 20 22 41 44 7 75 -20 -40 39 30 -40 45 11 -39 49 47 -41 34 45 - 27 0 0 -40 29 8 22 41 43 8 75 -21 -40 26 17 -40 31 59 -39 36 23 -41 21 45 - 26 0 0 -40 15 13 22 41 41 8 74 -21 -40 12 21 -40 18 5 -39 22 15 -41 8 3 - 25 0 0 -40 0 35 22 41 39 9 73 -22 -39 57 43 -40 3 28 -39 7 24 -40 53 38 - 24 0 0 -39 45 13 22 41 38 10 73 -23 -39 42 20 -39 48 7 -38 51 48 -40 38 30 - 23 0 0 -39 29 8 22 41 36 11 72 -23 -39 26 14 -39 32 2 -38 35 28 -40 22 39 - 22 0 0 -39 12 17 22 41 33 12 72 -24 -39 9 22 -39 15 12 -38 18 22 -40 6 3 - 21 0 0 -38 54 40 22 41 31 13 71 -25 -38 51 45 -38 57 36 -38 0 30 -39 48 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60 52 20 60 46 40 61 41 59 59 57 9 120 0 0 60 57 17 22 16 52 17 252 -10 61 0 7 60 54 28 61 49 35 60 5 8 121 0 0 61 4 38 22 16 50 16 253 -10 61 7 27 61 1 49 61 56 45 60 12 40 122 0 0 61 11 32 22 16 48 16 254 -10 61 14 21 61 8 44 62 3 29 60 19 44 123 0 0 61 18 0 22 16 46 15 255 -9 61 20 48 61 15 12 62 9 47 60 26 22 124 0 0 61 24 2 22 16 44 15 256 -9 61 26 50 61 21 15 62 15 40 60 32 33 125 0 0 61 29 39 22 16 43 14 257 -8 61 32 26 61 26 52 62 21 8 60 38 18 126 0 0 61 34 50 22 16 41 14 258 -8 61 37 37 61 32 4 62 26 12 60 43 37 127 0 0 61 39 37 22 16 40 13 259 -8 61 42 23 61 36 51 62 30 51 60 48 30 128 0 0 61 43 58 22 16 38 13 259 -7 61 46 44 61 41 13 62 35 6 60 52 59 129 0 0 61 47 56 22 16 37 13 260 -7 61 50 41 61 45 10 62 38 57 60 57 2 130 0 0 61 51 29 22 16 35 12 261 -6 61 54 14 61 48 43 62 42 24 61 0 40 131 0 0 61 54 37 22 16 34 12 262 -6 61 57 22 61 51 52 62 45 28 61 3 54 132 0 0 61 57 22 22 16 33 11 263 -5 62 0 7 61 54 37 62 48 9 61 6 43 133 0 0 61 59 43 22 16 31 11 264 -5 62 2 28 61 56 59 62 50 26 61 9 8 134 0 0 62 1 40 22 16 30 10 265 -5 62 4 25 61 58 56 62 52 20 61 11 8 135 0 0 62 3 14 22 16 29 10 266 -4 62 5 58 62 0 30 62 53 51 61 12 44 136 0 0 62 4 24 22 16 28 9 266 -4 62 7 8 62 1 40 62 54 59 61 13 56 137 0 0 62 5 11 22 16 27 9 267 -3 62 7 55 62 2 27 62 55 45 61 14 44 138 0 0 62 5 34 22 16 26 8 268 -3 62 8 18 62 2 50 62 56 7 61 15 8 139 0 0 62 5 34 22 16 25 8 269 -3 62 8 18 62 2 50 62 56 7 61 15 8 140 0 0 62 5 10 22 16 24 7 270 -2 62 7 54 62 2 26 62 55 43 61 14 44 141 0 0 62 4 23 22 16 23 7 271 -2 62 7 7 62 1 39 62 54 57 61 13 56 142 0 0 62 3 12 22 16 23 6 272 -1 62 5 56 62 0 28 62 53 48 61 12 43 143 0 0 62 1 37 22 16 22 6 273 -1 62 4 22 61 58 53 62 52 15 61 11 7 144 0 0 61 59 39 22 16 21 5 273 -1 62 2 23 61 56 55 62 50 20 61 9 6 145 0 0 61 57 17 22 16 21 5 274 0 62 0 2 61 54 32 62 48 1 61 6 40 Uncertainty in time = +/- 12 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 0097-01073-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 59 52.0523 DE: +06 27 30.532 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .035 ) * V mag [mag]: 10.5 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2810) Lev Tolstoj approx. diameter [km]: 10 approx. diameter ["]: .010 distance from Earth [AU]: 1.34700 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 838 number of rejected observations: 19 time covered by the observations: 1953 Oct 10 - 2012 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.096, 0.056, 89° remarks: * orbital elements for (2810) Lev Tolstoj : Mean anomaly = 338.39928314 deg Arg. of pericenter = 258.79054206 deg Long. of node = 193.38950925 deg Inclination = 12.71912504 deg Eccentricity = 0.15350267 Semimajor axis = 2.60761547 AU Perihelion dist = 2.20733954 AU Mag: H = 12.36, G = 0.15 Epoch of elements : MJD 56238.93700000 TDT (2012 Nov 07.937) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 7 2810 Lev Tolstoj 22h 29.1m UT 10.5 4 59 52.052 6 27 30.53TYC 0097-01073-1 11.7 15.8 10 1.2 1.347 -1.249 -23.78 50.1788 6.465 -161.33 -16.60 22.4843 -0.13209 0.10292 -2.84827 -3.64246 -0.00286 0.00107 2000 336.30743320121030.00000258.790542193.389509 12.7191250.15350267 2.6076155 2.207339512.6 5.00.15 RATE 2.3406620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.099 0.066 89 9.74 0.090 0 0 3 2 056226.0020121107_1073-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org