IOTA/IOTA-ES occultation update for (104) Klymene / TYC 6831-00139-1 event on 2012 Oct 09, 21:13 UT Visible from Brazil, Africa Summary ------- On 2012 Oct 09 UT, the 127 km diameter asteroid (104) Klymene will occult a 10.1 mag star in the constellation Ophiuchus for observers along a path across Brazil, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 14.8 mag (the magnitude of the asteroid) for at most 5.1 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: 68 * date and approx. time of event: 2012 Oct 09, 21:15 - 2012 Oct 09, 21:17 UT * geocentric midpoint of event [JD]: 2456210.38443333 * magnitude of target star: 10.1 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 5.1 * Moon: 35 % sunlit, 142° distance * Sun: 69° distance * rough path description: Brazil, Africa The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.87 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .040", 90° ) * approx speed of asteroid's shadow [km/s]: 24.8796 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6831-00139-1 by 104 Klymene on 2012 Oct 9 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 - 50 0 0 -11 36 26 21 15 8 65 233 -1 -12 12 7 -11 0 41 -13 14 1 - 9 58 14 - 49 0 0 -11 26 34 21 15 13 64 233 -2 -12 2 17 -10 50 45 -13 4 16 - 9 48 14 - 48 0 0 -11 16 13 21 15 17 63 234 -3 -11 52 0 -10 40 22 -12 54 3 - 9 37 46 - 47 0 0 -11 5 25 21 15 21 62 235 -4 -11 41 14 -10 29 31 -12 43 22 - 9 26 50 - 46 0 0 -10 54 9 21 15 25 61 235 -5 -11 30 1 -10 18 12 -12 32 15 - 9 15 26 - 45 0 0 -10 42 26 21 15 29 60 236 -6 -11 18 21 -10 6 26 -12 20 40 - 9 3 34 - 44 0 0 -10 30 15 21 15 33 59 236 -7 -11 6 13 - 9 54 12 -12 8 38 - 8 51 14 - 43 0 0 -10 17 37 21 15 37 58 237 -8 -10 53 38 - 9 41 30 -11 56 8 - 8 38 27 - 42 0 0 -10 4 31 21 15 41 57 237 -9 -10 40 36 - 9 28 21 -11 43 12 - 8 25 12 - 41 0 0 - 9 50 58 21 15 45 57 238 -10 -10 27 7 - 9 14 45 -11 29 49 - 8 11 29 - 40 0 0 - 9 36 59 21 15 49 56 238 -11 -10 13 11 - 9 0 41 -11 15 58 - 7 57 20 - 39 0 0 - 9 22 32 21 15 53 55 238 -12 - 9 58 47 - 8 46 11 -11 1 41 - 7 42 43 - 38 0 0 - 9 7 38 21 15 57 54 239 -13 - 9 43 57 - 8 31 13 -10 46 58 - 7 27 39 - 37 0 0 - 8 52 18 21 16 0 53 239 -14 - 9 28 41 - 8 15 49 -10 31 48 - 7 12 8 - 36 0 0 - 8 36 31 21 16 4 52 239 -15 - 9 12 58 - 7 59 58 -10 16 11 - 6 56 10 - 35 0 0 - 8 20 17 21 16 8 51 239 -16 - 8 56 48 - 7 43 41 -10 0 9 - 6 39 46 - 34 0 0 - 8 3 38 21 16 12 50 239 -17 - 8 40 13 - 7 26 58 - 9 43 40 - 6 22 56 - 33 0 0 - 7 46 33 21 16 15 49 240 -18 - 8 23 12 - 7 9 48 - 9 26 46 - 6 5 39 - 32 0 0 - 7 29 1 21 16 19 48 240 -19 - 8 5 44 - 6 52 13 - 9 9 26 - 5 47 56 - 31 0 0 - 7 11 5 21 16 22 47 240 -20 - 7 47 52 - 6 34 12 - 8 51 40 - 5 29 48 - 30 0 0 - 6 52 42 21 16 26 46 240 -21 - 7 29 34 - 6 15 46 - 8 33 30 - 5 11 14 - 29 0 0 - 6 33 55 21 16 29 45 240 -22 - 7 10 51 - 5 56 54 - 8 14 54 - 4 52 15 - 28 0 0 - 6 14 43 21 16 33 43 240 -23 - 6 51 43 - 5 37 38 - 7 55 53 - 4 32 51 - 27 0 0 - 5 55 6 21 16 36 42 240 -24 - 6 32 10 - 5 17 57 - 7 36 28 - 4 13 3 - 26 0 0 - 5 35 5 21 16 39 41 240 -25 - 6 12 14 - 4 57 51 - 7 16 39 - 3 52 50 - 25 0 0 - 5 14 40 21 16 42 40 240 -26 - 5 51 53 - 4 37 22 - 6 56 26 - 3 32 13 - 24 0 0 - 4 53 52 21 16 45 39 241 -27 - 5 31 9 - 4 16 29 - 6 35 49 - 3 11 12 - 23 0 0 - 4 32 40 21 16 48 38 241 -29 - 5 10 1 - 3 55 13 - 6 14 49 - 2 49 48 - 22 0 0 - 4 11 5 21 16 51 37 241 -30 - 4 48 31 - 3 33 33 - 5 53 26 - 2 28 1 - 21 0 0 - 3 49 7 21 16 54 36 241 -31 - 4 26 37 - 3 11 31 - 5 31 40 - 2 5 52 - 20 0 0 - 3 26 47 21 16 57 35 241 -32 - 4 4 22 - 2 49 7 - 5 9 32 - 1 43 20 - 19 0 0 - 3 4 6 21 17 0 34 241 -33 - 3 41 45 - 2 26 21 - 4 47 2 - 1 20 27 - 18 0 0 - 2 41 3 21 17 3 33 241 -34 - 3 18 46 - 2 3 14 - 4 24 11 - 0 57 12 - 17 0 0 - 2 17 39 21 17 5 32 241 -35 - 2 55 26 - 1 39 46 - 4 0 58 - 0 33 36 - 16 0 0 - 1 53 54 21 17 8 31 241 -36 - 2 31 46 - 1 15 57 - 3 37 25 - 0 9 40 - 15 0 0 - 1 29 50 21 17 11 30 241 -37 - 2 7 46 - 0 51 49 - 3 13 32 0 14 36 - 14 0 0 - 1 5 26 21 17 13 29 241 -38 - 1 43 26 - 0 27 20 - 2 49 19 0 39 11 - 13 0 0 - 0 40 43 21 17 15 28 241 -39 - 1 18 47 - 0 2 33 - 2 24 47 1 4 6 - 12 0 0 - 0 15 42 21 17 18 26 241 -40 - 0 53 49 0 22 32 - 1 59 57 1 29 18 - 11 0 0 0 9 38 21 17 20 25 241 -41 - 0 28 34 0 47 55 - 1 34 48 1 54 48 - 10 0 0 0 35 15 21 17 22 24 241 -42 - 0 3 1 1 13 36 - 1 9 22 2 20 36 - 9 0 0 1 1 8 21 17 24 23 241 -43 0 22 49 1 39 33 - 0 43 39 2 46 40 - 8 0 0 1 27 18 21 17 26 22 241 -44 0 48 55 2 5 47 - 0 17 39 3 13 0 - 7 0 0 1 53 43 21 17 28 21 242 -45 1 15 16 2 32 16 0 8 36 3 39 35 - 6 0 0 2 20 23 21 17 29 20 242 -47 1 41 53 2 58 59 0 35 7 4 6 25 - 5 0 0 2 47 18 21 17 31 19 242 -48 2 8 44 3 25 57 1 1 52 4 33 29 - 4 0 0 3 14 26 21 17 33 18 242 -49 2 35 49 3 53 9 1 28 51 5 0 46 - 3 0 0 3 41 47 21 17 34 17 242 -50 3 3 7 4 20 33 1 56 4 5 28 16 - 2 0 0 4 9 20 21 17 36 16 242 -51 3 30 37 4 48 9 2 23 28 5 55 57 - 1 0 0 4 37 5 21 17 37 14 242 -52 3 58 19 5 15 57 2 51 5 6 23 50 0 0 0 5 5 0 21 17 38 13 242 -53 4 26 11 5 43 55 3 18 53 6 51 54 1 0 0 5 33 6 21 17 39 12 242 -54 4 54 14 6 12 3 3 46 51 7 20 7 2 0 0 6 1 21 21 17 40 11 242 -55 5 22 27 6 40 21 4 14 59 7 48 29 3 0 0 6 29 44 21 17 41 10 242 -56 5 50 48 7 8 47 4 43 16 8 16 59 4 0 0 6 58 16 21 17 42 9 243 -57 6 19 17 7 37 20 5 11 42 8 45 36 5 0 0 7 26 54 21 17 43 8 243 -58 6 47 53 8 6 1 5 40 14 9 14 21 6 0 0 7 55 39 21 17 43 7 243 -59 7 16 36 8 34 47 6 8 54 9 43 11 7 0 0 8 24 29 21 17 44 6 243 -60 7 45 24 9 3 39 6 37 39 10 12 6 8 0 0 8 53 23 21 17 44 5 243 -61 8 14 17 9 32 36 7 6 29 10 41 5 9 0 0 9 22 22 21 17 45 3 243 -62 8 43 15 10 1 36 7 35 24 11 10 8 10 0 0 9 51 24 21 17 45 2 243 -63 9 12 15 10 30 39 8 4 22 11 39 13 11 0 0 10 20 28 21 17 45 1 244 -64 9 41 18 10 59 44 8 33 23 12 8 20 12 0 0 10 49 34 21 17 45 0 244 -65 10 10 23 .. .. .. 9 2 26 .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6831-00139-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 42 03.1971 DE: -25 37 48.278 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .041, .039 ) * V mag [mag]: 10.1 * B mag [mag]: 11.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (104) Klymene approx. diameter [km]: 127 approx. diameter ["]: .046 distance from Earth [AU]: 3.79600 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1192 number of rejected observations: 138 time covered by the observations: 1910 Mar 06 - 2012 Aug 12 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.009, 94° remarks: * orbital elements for (104) Klymene : Mean anomaly = 217.03133049 deg Arg. of pericenter = 31.60619110 deg Long. of node = 41.78949684 deg Inclination = 2.78889320 deg Eccentricity = 0.15572324 Semimajor axis = 3.15081061 AU Perihelion dist = 2.66015617 AU Mag: H = 8.20, G = 0.15 Epoch of elements : MJD 56209.88400000 TDT (2012 Oct 09.884) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 9 104 Klymene 21h 13.6m UT 10.1 17 42 3.197-25 37 48.28TYC 6831-00139-1 11.6 14.8 127 5.1 3.796 2.406 -0.25 -71.7706 -25.630 -141.63 -6.67 21.2264 0.00209 0.21572 14.04234 -0.10962 0.00554 -0.00025 2000 215.2895102012 930.00000 31.606191 41.789497 2.7888930.15572324 3.1508106 2.6601562 8.3 5.00.15 RATE 1.7622620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.040 90 1.87 0.040 0 0 1 2 056165.0020121009_0139-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 23:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org