IOTA/IOTA-ES occultation update for (3482) Lesnaya / TYC 0640-00549-1 event on 2012 Oct 25, 23:57 UT Visible from Africa Summary ------- On 2012 Oct 25 UT, the 12 km diameter asteroid (3482) Lesnaya will occult a 9.8 mag star in the constellation Cetus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.1 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: 14 * date and approx. time of event: 2012 Oct 25, 23:49 - 2012 Oct 26, 00:06 UT * geocentric midpoint of event [JD]: 2456226.49870833 * magnitude of target star: 9.8 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.4 * Moon: 86 % sunlit, 54° distance * Sun: 168° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 4.87 * 1 sigma uncertainty interval [seconds]: +/- 11.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .102 +/- .064) * 1 sigma uncertainty ellipse (major, minor, PA): ( .105", .058", 73° ) * approx speed of asteroid's shadow [km/s]: 8.7698 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0640-00549-1 by 3482 Lesnaya on 2012 Oct 25 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 - 68 0 0 -63 34 34 24 6 42 0 72 -1 -63 29 45 -63 39 23 .. .. .. -64 26 45 - 67 0 0 -63 25 51 24 6 42 1 71 -1 -63 21 1 -63 30 41 .. .. .. -64 18 10 - 66 0 0 -63 16 53 24 6 42 1 70 -1 -63 12 2 -63 21 44 .. .. .. -64 9 20 - 65 0 0 -63 7 39 24 6 42 2 69 -2 -63 2 47 -63 12 30 .. .. .. -64 0 14 - 64 0 0 -62 58 8 24 6 41 2 68 -2 -62 53 16 -63 3 1 .. .. .. -63 50 53 - 63 0 0 -62 48 22 24 6 41 3 68 -3 -62 43 29 -62 53 15 .. .. .. -63 41 15 - 62 0 0 -62 38 19 24 6 41 3 67 -3 -62 33 26 -62 43 13 .. .. .. -63 31 21 - 61 0 0 -62 28 1 24 6 40 4 66 -4 -62 23 6 -62 32 55 .. .. .. -63 21 11 - 60 0 0 -62 17 25 24 6 39 4 65 -4 -62 12 30 -62 22 21 .. .. .. -63 10 44 - 59 0 0 -62 6 33 24 6 39 5 64 -5 -62 1 37 -62 11 30 -61 13 58 -63 0 1 - 58 0 0 -61 55 25 24 6 38 5 63 -5 -61 50 28 -62 0 22 -61 2 41 -62 49 1 - 57 0 0 -61 44 0 24 6 37 6 62 -6 -61 39 2 -61 48 58 -60 51 7 -62 37 45 - 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33 -23 49 47 -25 28 47 65 0 0 -24 32 8 23 51 31 27 293 -15 -24 27 31 -24 36 44 -23 43 1 -25 21 56 66 0 0 -24 25 46 23 51 24 26 293 -14 -24 21 10 -24 30 22 -23 36 42 -25 15 32 67 0 0 -24 19 51 23 51 17 25 292 -13 -24 15 15 -24 24 27 -23 30 49 -25 9 35 68 0 0 -24 14 23 23 51 10 25 292 -13 -24 9 48 -24 18 59 -23 25 23 -25 4 6 69 0 0 -24 9 22 23 51 4 24 291 -12 -24 4 47 -24 13 58 -23 20 24 -24 59 3 70 0 0 -24 4 49 23 50 57 23 290 -11 -24 0 14 -24 9 24 -23 15 52 -24 54 28 71 0 0 -24 0 43 23 50 51 22 290 -10 -23 56 7 -24 5 18 -23 11 47 -24 50 21 72 0 0 -23 57 4 23 50 45 21 289 -9 -23 52 29 -24 1 39 -23 8 9 -24 46 41 73 0 0 -23 53 53 23 50 40 21 289 -9 -23 49 18 -23 58 28 -23 4 58 -24 43 29 74 0 0 -23 51 9 23 50 34 20 288 -8 -23 46 34 -23 55 45 -23 2 16 -24 40 45 75 0 0 -23 48 54 23 50 29 19 288 -7 -23 44 19 -23 53 29 -23 0 0 -24 38 29 76 0 0 -23 47 6 23 50 24 18 287 -6 -23 42 31 -23 51 42 -22 58 13 -24 36 42 77 0 0 -23 45 47 23 50 19 17 287 -5 -23 41 12 -23 50 22 -22 56 53 -24 35 22 78 0 0 -23 44 56 23 50 14 16 286 -4 -23 40 21 -23 49 31 -22 56 2 -24 34 31 79 0 0 -23 44 33 23 50 10 16 286 -3 -23 39 58 -23 49 8 -22 55 38 -24 34 9 80 0 0 -23 44 38 23 50 5 15 285 -3 -23 40 3 -23 49 13 -22 55 42 -24 34 15 81 0 0 -23 45 12 23 50 1 14 285 -2 -23 40 36 -23 49 47 -22 56 15 -24 34 50 82 0 0 -23 46 14 23 49 58 13 284 -1 -23 41 39 -23 50 50 -22 57 16 -24 35 54 Uncertainty in time = +/- 12 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 0640-00549-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 47 28.0612 DE: +07 37 39.529 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .025 ) * V mag [mag]: 9.8 * B mag [mag]: 10.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3482) Lesnaya approx. diameter [km]: 12 approx. diameter ["]: .012 distance from Earth [AU]: 1.34800 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 976 number of rejected observations: 18 time covered by the observations: 1942 Sep 11 - 2012 Sep 18 1 sigma uncertainty ellipse (major, minor, PA): 0.102, 0.053, 72° remarks: * orbital elements for (3482) Lesnaya : Mean anomaly = 14.65183157 deg Arg. of pericenter = 248.29719223 deg Long. of node = 128.80522414 deg Inclination = 4.69377729 deg Eccentricity = 0.17068310 Semimajor axis = 2.78194068 AU Perihelion dist = 2.30711042 AU Mag: H = 12.17, G = 0.15 Epoch of elements : MJD 56225.99800000 TDT (2012 Oct 25.998) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 25 3482 Lesnaya 23h 58.1m UT 9.8 2 47 28.061 7 37 39.53TYC 0640-00549-1 10.8 15.1 12 1.4 1.348 -2.045 -10.90 7.5612 7.629 176.47 -12.50 23.9690 0.23689 -0.66223 -4.65916 -1.67156 -0.00105 0.00049 2000 13.37777520121020.00000248.297192128.805224 4.6937770.17068310 2.7819407 2.307110412.2 5.00.15 RATE 2.1241360 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.105 0.058 73 5.87 0.060 0 0 2-1 056197.0020121025_0549-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 22:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org