IOTA/IOTA-ES occultation update for (4164) Shilov / TYC 0714-00254-1 event on 2012 Nov 28, 22:50 UT Visible from Russia, Europe, N Africa Summary ------- On 2012 Nov 28 UT, the 16 km diameter asteroid (4164) Shilov will occult a 8.8 mag star in the constellation Orion for observers along a path across Russia, Europe, N Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.1 mag to 14.9 mag (the magnitude of the asteroid) for at most 1.7 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: 16 * date and approx. time of event: 2012 Nov 28, 22:42 - 2012 Nov 28, 22:58 UT * geocentric midpoint of event [JD]: 2456260.4517 * magnitude of target star: 8.8 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 1.7 * Moon: 100 % sunlit, 19° distance * Sun: 158° distance * rough path description: Russia, Europe, N Africa The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 4.17 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .086 +/- .058) * 1 sigma uncertainty ellipse (major, minor, PA): ( .086", .058", 95° ) * approx speed of asteroid's shadow [km/s]: 9.4738 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0714-00254-1 by 4164 Shilov on 2012 Nov 28 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 - 54 48 51 7 0 0 22 58 49 5 81 -24 - 55 15 3 - 54 23 19 - 59 28 58 - 51 10 21 - 50 53 7 8 0 0 22 58 42 9 82 -28 - 51 14 28 - 50 32 7 - 54 29 1 - 47 48 23 Latitude Latitude Latitude Latitude - 50 0 0 8 15 16 22 58 40 9 82 -29 8 21 14 8 9 18 9 11 29 7 19 52 - 49 0 0 8 33 16 22 58 37 11 82 -30 8 39 16 8 27 17 9 29 41 7 37 41 - 48 0 0 8 52 6 22 58 34 12 82 -31 8 58 7 8 46 5 9 48 43 7 56 18 - 47 0 0 9 11 44 22 58 30 13 82 -32 9 17 47 9 5 42 10 8 35 8 15 44 - 46 0 0 9 32 11 22 58 27 14 83 -33 9 38 15 9 26 7 10 29 16 8 35 57 - 45 0 0 9 53 27 22 58 23 15 83 -34 9 59 33 9 47 22 10 50 46 8 56 59 - 44 0 0 10 15 31 22 58 19 16 83 -35 10 21 39 10 9 25 11 13 6 9 18 49 - 43 0 0 10 38 24 22 58 14 17 83 -36 10 44 33 10 32 16 11 36 15 9 41 27 - 42 0 0 11 2 5 22 58 9 18 84 -37 11 8 16 10 55 55 12 0 13 10 4 52 - 41 0 0 11 26 35 22 58 4 19 84 -38 11 32 47 11 20 23 12 24 59 10 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44 75 22 14 144 0 0 76 13 46 22 42 6 5 290 -13 76 20 3 76 7 30 77 12 50 .. .. .. 145 0 0 76 7 15 22 42 6 4 291 -12 76 13 34 76 0 57 77 6 40 .. .. .. 146 0 0 76 0 28 22 42 6 4 292 -12 76 6 49 75 54 8 77 0 15 .. .. .. 147 0 0 75 53 24 22 42 5 4 293 -12 75 59 47 75 47 2 76 53 33 .. .. .. 148 0 0 75 46 2 22 42 5 4 294 -12 75 52 28 75 39 38 76 46 34 .. .. .. 149 0 0 75 38 23 22 42 5 3 295 -11 75 44 51 75 31 55 76 39 18 .. .. .. 150 0 0 75 30 25 22 42 5 3 296 -11 75 36 55 75 23 55 76 31 45 .. .. .. 151 0 0 75 22 7 22 42 4 3 297 -11 75 28 41 75 15 35 76 23 53 .. .. .. 152 0 0 75 13 31 22 42 4 3 298 -11 75 20 7 75 6 55 76 15 42 .. .. .. 153 0 0 75 4 34 22 42 4 2 298 -10 75 11 13 74 57 56 76 7 12 .. .. .. 154 0 0 74 55 16 22 42 4 2 299 -10 75 1 58 74 48 35 75 58 22 .. .. .. 155 0 0 74 45 37 22 42 4 2 300 -10 74 52 21 74 38 53 75 49 11 .. .. .. 156 0 0 74 35 35 22 42 3 1 301 -9 74 42 23 74 28 48 75 39 39 .. .. .. 157 0 0 74 25 11 22 42 3 1 302 -9 74 32 2 74 18 21 75 29 45 .. .. .. 158 0 0 74 14 24 22 42 3 1 303 -9 74 21 18 74 7 30 75 19 28 .. .. .. 159 0 0 74 3 12 22 42 3 0 304 -9 74 10 9 73 56 15 75 8 48 .. .. .. Uncertainty in time = +/- 9 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0714-00254-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 37 27.3456 DE: +09 16 52.345 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .028 ) * V mag [mag]: 8.8 * B mag [mag]: 9.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4164) Shilov approx. diameter [km]: 16 approx. diameter ["]: .017 distance from Earth [AU]: 1.29200 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 912 number of rejected observations: 12 time covered by the observations: 1969 Oct 16 - 2012 Oct 27 1 sigma uncertainty ellipse (major, minor, PA): 0.081, 0.051, 96° remarks: * orbital elements for (4164) Shilov : Mean anomaly = 359.29808708 deg Arg. of pericenter = 220.09641097 deg Long. of node = 218.22086192 deg Inclination = 12.83343845 deg Eccentricity = 0.15181079 Semimajor axis = 2.63632279 AU Perihelion dist = 2.23610054 AU Mag: H = 12.00, G = 0.15 Epoch of elements : MJD 56259.95200000 TDT (2012 Nov 28.952) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 28 4164 Shilov 22h 50.4m UT 8.8 5 37 27.346 9 16 52.35TYC 0714-00254-1 9.4 14.9 16 1.7 1.292 -2.012 -20.96 33.5158 9.288 -165.54 -21.50 22.8408 -0.38096 0.53894 -4.37144 -3.07961 -0.00173 0.00124 2000 357.00660420121119.00000220.096411218.220862 12.8334380.15181079 2.6363228 2.236100512.0 5.00.15 RATE 2.3025350 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.086 0.058 95 5.17 0.071 0 0-4-5 056247.0020121128_0254-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 09:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org