IOTA/IOTA-ES occultation update for (1632) Siebohme / TYC 5234-01854-1 event on 2012 Sep 24, 11:21 UT Visible from SW USA, Hawaii, E Australia Summary ------- On 2012 Sep 24 UT, the 28 km diameter asteroid (1632) Siebohme will occult a 11.0 mag star in the constellation Aquarius for observers along a path across SW USA, Hawaii, E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.4 mag (the magnitude of the asteroid) for at most 3.6 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: 42 * date and approx. time of event: 2012 Sep 24, 11:08 - 2012 Sep 24, 11:35 UT * geocentric midpoint of event [JD]: 2456194.97400417 * magnitude of target star: 11.0 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 3.6 * Moon: 68 % sunlit, 49° distance * Sun: 161° distance * rough path description: SW USA, Hawaii, E Australia The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 1.57 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .042) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .040", 76° ) * approx speed of asteroid's shadow [km/s]: 7.7333 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5234-01854-1 by 1632 Siebohme on 2012 Sep 24 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 -102 54 37 36 0 0 11 8 54 2 266 -19 -104 38 50 -100 34 39 -108 39 57 ... .. .. -112 8 54 35 0 0 11 9 5 10 260 -27 -112 58 33 -111 16 41 -115 21 26 -108 10 1 Latitude Latitude Latitude Latitude -114 0 0 34 42 10 11 9 9 11 259 -28 34 49 55 34 34 25 35 14 14 34 10 4 -115 0 0 34 31 43 11 9 12 12 259 -29 34 39 28 34 23 57 35 3 51 33 59 33 -116 0 0 34 20 41 11 9 14 13 258 -30 34 28 28 34 12 54 34 52 54 33 48 26 -117 0 0 34 9 4 11 9 17 14 258 -31 34 16 52 34 1 16 34 41 22 33 36 45 -118 0 0 33 56 52 11 9 20 15 257 -32 34 4 42 33 49 3 34 29 15 33 24 28 -119 0 0 33 44 5 11 9 23 16 257 -33 33 51 56 33 36 14 34 16 33 33 11 36 -120 0 0 33 30 43 11 9 27 16 256 -33 33 38 35 33 22 51 34 3 16 32 58 8 -121 0 0 33 16 45 11 9 30 17 255 -34 33 24 38 33 8 51 33 49 23 32 44 4 -122 0 0 33 2 11 11 9 34 18 255 -35 33 10 5 32 54 16 33 34 55 32 29 24 -123 0 0 32 47 0 11 9 38 19 254 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-39 56 39 -40 13 6 -39 30 52 -40 38 55 113 0 0 -40 23 29 11 34 27 30 65 -14 -40 15 18 -40 31 40 -39 49 36 -40 57 23 112 0 0 -40 41 30 11 34 33 29 66 -13 -40 33 21 -40 49 39 -40 7 45 -41 15 17 111 0 0 -40 58 57 11 34 38 28 66 -12 -40 50 49 -41 7 4 -40 25 20 -41 32 36 110 0 0 -41 15 49 11 34 43 27 67 -11 -41 7 43 -41 23 55 -40 42 19 -41 49 21 109 0 0 -41 32 7 11 34 48 26 68 -11 -41 24 3 -41 40 11 -40 58 45 -42 5 32 108 0 0 -41 47 52 11 34 53 26 68 -10 -41 39 50 -41 55 54 -41 14 36 -42 21 9 107 0 0 -42 3 3 11 34 58 25 69 -9 -41 55 2 -42 11 3 -41 29 54 -42 36 13 106 0 0 -42 17 41 11 35 3 24 70 -8 -42 9 42 -42 25 40 -41 44 38 -42 50 45 105 0 0 -42 31 46 11 35 7 23 70 -7 -42 23 48 -42 39 43 -41 58 50 -43 4 43 104 0 0 -42 45 18 11 35 11 23 71 -7 -42 37 22 -42 53 14 -42 12 28 -43 18 9 103 0 0 -42 58 18 11 35 15 22 72 -6 -42 50 24 -43 6 13 -42 25 35 -43 31 3 102 0 0 -43 10 46 11 35 19 21 72 -5 -43 2 53 -43 18 39 -42 38 9 -43 43 25 101 0 0 -43 22 42 11 35 23 20 73 -5 -43 14 51 -43 30 34 -42 50 11 -43 55 16 100 0 0 -43 34 7 11 35 27 20 74 -4 -43 26 17 -43 41 58 -43 1 41 -44 6 35 99 0 0 -43 45 1 11 35 30 19 74 -3 -43 37 12 -43 52 50 -43 12 40 -44 17 24 98 0 0 -43 55 23 11 35 34 18 75 -2 -43 47 36 -44 3 11 -43 23 7 -44 27 41 97 0 0 -44 5 15 11 35 37 17 76 -2 -43 57 29 -44 13 2 -43 33 4 -44 37 28 96 0 0 -44 14 37 11 35 40 17 77 -1 -44 6 51 -44 22 22 -43 42 30 -44 46 45 95 0 0 -44 23 28 11 35 43 16 77 0 -44 15 43 -44 31 12 -43 51 25 -44 55 32 Uncertainty in time = +/- 8 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: TYC 5234-01854-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 48 53.0656 DE: -02 20 18.968 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .031 ) * V mag [mag]: 11.0 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1632) Siebohme approx. diameter [km]: 28 approx. diameter ["]: .029 distance from Earth [AU]: 1.35300 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1142 number of rejected observations: 39 time covered by the observations: 1917 Sep 25 - 2012 Sep 03 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.026, 72° remarks: * orbital elements for (1632) Siebohme : Mean anomaly = 18.66531303 deg Arg. of pericenter = 126.07483378 deg Long. of node = 200.05857277 deg Inclination = 5.71347564 deg Eccentricity = 0.13463942 Semimajor axis = 2.65534684 AU Perihelion dist = 2.29783248 AU Mag: H = 11.73, G = 0.15 Epoch of elements : MJD 56194.47400000 TDT (2012 Sep 24.474) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 24 1632 Siebohme 11h 22.6m UT 11.0 22 48 53.066- 2 20 18.97TYC 5234-01854-1 11.7 14.4 28 3.6 1.353 -1.434 -18.49 167.8806 -2.334 7.33 -0.72 11.3761 0.05362 -0.06189 -3.30922 -2.84626 0.00184 0.00028 2000 17.6462102012 920.00000126.074834200.058573 5.7134760.13463942 2.6553468 2.297832511.3 5.00.15 RATE 2.2778340 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.040 76 2.57 0.045 0 0-4 2 056178.0020120924_1854-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 23:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org