IOTA/IOTA-ES occultation update for (2871) Schober / TYC 2403-01341-1 event on 2012 Nov 16, 20:26 UT Visible from Japan, Russia Summary ------- On 2012 Nov 16 UT, the 19 km diameter asteroid (2871) Schober will occult a 9.9 mag star in the constellation Auriga for observers along a path across Japan, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 15.4 mag (the magnitude of the asteroid) for at most 2.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 31 * date and approx. time of event: 2012 Nov 16, 20:16 - 2012 Nov 16, 20:38 UT * geocentric midpoint of event [JD]: 2456248.3517 * magnitude of target star: 9.9 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 2.7 * Moon: 13 % sunlit, 163° distance * Sun: 150° distance * rough path description: Japan, Russia The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 2.16 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .044", 85° ) * approx speed of asteroid's shadow [km/s]: 7.0862 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2403-01341-1 by 2871 Schober on 2012 Nov 16 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 - 47 0 0 45 14 40 20 38 37 1 46 -11 45 23 26 45 5 55 46 1 34 .. .. .. - 46 0 0 45 56 35 20 38 36 2 47 -12 46 5 21 45 47 51 46 43 28 .. .. .. - 45 0 0 46 37 55 20 38 35 3 47 -13 46 46 41 46 29 11 47 24 46 .. .. .. - 44 0 0 47 18 39 20 38 34 4 48 -13 47 27 24 47 9 55 48 5 27 46 32 28 - 43 0 0 47 58 44 20 38 33 5 49 -14 48 7 29 47 50 2 48 45 29 47 12 38 - 42 0 0 48 38 12 20 38 31 6 49 -15 48 46 55 48 29 29 49 24 52 47 52 9 - 41 0 0 49 16 59 20 38 29 7 50 -16 49 25 42 49 8 18 50 3 34 48 31 1 - 40 0 0 49 55 7 20 38 27 7 51 -16 50 3 48 49 46 26 50 41 36 49 9 14 - 39 0 0 50 32 33 20 38 25 8 52 -17 50 41 13 50 23 54 51 18 56 49 46 47 - 38 0 0 51 9 19 20 38 22 9 53 -18 51 17 57 51 0 41 51 55 34 50 23 39 - 37 0 0 51 45 22 20 38 19 10 53 -19 51 54 0 51 36 46 52 31 30 50 59 50 - 36 0 0 52 20 44 20 38 16 11 54 -19 52 29 20 52 12 9 53 6 44 51 35 20 - 35 0 0 52 55 23 20 38 13 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44 12 136 0 0 46 51 7 20 20 33 45 268 -17 46 59 45 46 42 31 47 37 17 46 5 35 137 0 0 46 12 0 20 20 20 45 270 -16 46 20 38 46 3 24 46 58 11 45 26 28 138 0 0 45 32 24 20 20 8 44 271 -16 45 41 2 45 23 48 46 18 34 44 46 52 139 0 0 44 52 20 20 19 55 43 272 -15 45 0 57 44 43 44 45 38 28 44 6 49 140 0 0 44 11 48 20 19 43 43 274 -14 44 20 25 44 3 12 44 57 54 43 26 19 141 0 0 43 30 50 20 19 30 42 275 -13 43 39 27 43 22 15 44 16 54 42 45 23 142 0 0 42 49 27 20 19 18 41 276 -12 42 58 3 42 40 53 43 35 28 42 4 4 143 0 0 42 7 42 20 19 5 40 277 -11 42 16 17 41 59 8 42 53 38 41 22 22 144 0 0 41 25 34 20 18 53 39 278 -11 41 34 8 41 17 1 42 11 26 40 40 18 145 0 0 40 43 6 20 18 40 39 279 -10 40 51 39 40 34 33 41 28 53 39 57 55 146 0 0 40 0 18 20 18 28 38 280 -9 40 8 51 39 51 47 40 46 0 39 15 13 147 0 0 39 17 14 20 18 16 37 281 -8 39 25 45 39 8 44 40 2 49 38 32 14 148 0 0 38 33 54 20 18 4 36 282 -7 38 42 24 38 25 25 39 19 22 37 49 0 149 0 0 37 50 19 20 17 52 35 283 -6 37 58 48 37 41 52 38 35 41 37 5 33 150 0 0 37 6 33 20 17 41 34 284 -5 37 15 0 36 58 6 37 51 46 36 21 54 151 0 0 36 22 35 20 17 29 33 285 -4 36 31 1 36 14 10 37 7 40 35 38 4 152 0 0 35 38 29 20 17 18 32 286 -3 35 46 53 35 30 5 36 23 25 34 54 6 153 0 0 34 54 15 20 17 7 31 287 -2 35 2 37 34 45 53 35 39 2 34 10 0 154 0 0 34 9 55 20 16 56 31 288 -1 34 18 16 34 1 36 34 54 33 33 25 50 155 0 0 33 25 32 20 16 46 30 289 0 33 33 51 33 17 14 34 10 0 32 41 36 Uncertainty in time = +/- 8 secs Prediction of 2012 Sep 25.0 Data for the target star ------------------------ * name: TYC 2403-01341-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 31 13.5738 DE: +30 10 39.103 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .017 ) * V mag [mag]: 9.9 * B mag [mag]: 10.1 * Apparent position with proper motion RA(deg): 83.0231139182 DE(deg): 30.1849842745 * Equation of equinoxes (radians) : 0.000058701241890 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2871) Schober approx. diameter [km]: 19 approx. diameter ["]: .022 distance from Earth [AU]: 1.18300 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1022 number of rejected observations: 6 time covered by the observations: 1954 Oct 25 - 2011 Sep 02 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.040, 85° remarks: * orbital elements for (2871) Schober : Mean anomaly = 52.73864470 deg Arg. of pericenter = 335.45119245 deg Long. of node = 28.39475890 deg Inclination = 5.77344212 deg Eccentricity = 0.13943859 Semimajor axis = 2.25885795 AU Perihelion dist = 1.94388598 AU Mag: H = 12.62, G = 0.15 Epoch of elements : MJD 56247.85200000 TDT (2012 Nov 16.852) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 16 2871 Schober 20h 26.5m UT 9.9 5 31 13.574 30 10 39.10TYC 2403-01341-1 10.1 15.4 19 2.7 1.183 -2.176 9.43 79.8838 30.176 -130.38 -18.99 20.4408 0.18453 0.55194 -3.79269 1.26987 -0.00264 -0.00072 2000 50.459085201211 9.00000335.451192 28.394759 5.7734420.13943859 2.2588580 1.943886012.6 5.00.15 RATE 2.9031580 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.044 85 3.16 0.047 0 0-2 3 056195.0020121116_1341-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 25, 20:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org