IOTA/IOTA-ES occultation update for (1098) Hakone / TYC 1181-00217-1 event on 2012 Oct 27, 20:07 UT Visible from Europe Summary ------- On 2012 Oct 27 UT, the 25 km diameter asteroid (1098) Hakone will occult a 12.0 mag star in the constellation Pegasus for observers along a path across Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.9 mag (the magnitude of the asteroid) for at most 3.2 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: 54 * date and approx. time of event: 2012 Oct 27, 19:57 - 2012 Oct 27, 20:15 UT * geocentric midpoint of event [JD]: 2456228.33847917 * magnitude of target star: 12.0 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 3.2 * Moon: 96 % sunlit, 14° distance * Sun: 151° distance * rough path description: Europe The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 1.17 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .027", 68° ) * approx speed of asteroid's shadow [km/s]: 7.7345 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1181-00217-1 by 1098 Hakone on 2012 Oct 27 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 - 46 0 0 32 40 20 20 15 15 28 83 0 32 51 16 32 29 26 33 17 0 32 4 5 - 45 0 0 33 15 33 20 15 6 29 84 -1 33 26 32 33 4 36 33 52 23 32 39 8 - 44 0 0 33 50 58 20 14 57 30 85 -2 34 1 59 33 39 58 34 27 57 33 14 24 - 43 0 0 34 26 34 20 14 47 31 86 -3 34 37 38 34 15 32 35 3 43 33 49 51 - 42 0 0 35 2 20 20 14 37 32 87 -4 35 13 28 34 51 15 35 39 39 34 25 28 - 41 0 0 35 38 15 20 14 27 33 88 -5 35 49 25 35 27 7 36 15 44 35 1 14 - 40 0 0 36 14 18 20 14 16 33 89 -6 36 25 31 36 3 7 36 51 56 35 37 7 - 39 0 0 36 50 27 20 14 6 34 90 -7 37 1 43 36 39 14 37 28 14 36 13 8 - 38 0 0 37 26 41 20 13 55 35 91 -8 37 38 0 37 15 25 38 4 37 36 49 13 - 37 0 0 38 2 59 20 13 44 36 92 -8 38 14 20 37 51 40 38 41 4 37 25 22 - 36 0 0 38 39 20 20 13 33 36 93 -9 38 50 43 38 27 58 39 17 33 38 1 35 - 35 0 0 39 15 41 20 13 22 37 94 -10 39 27 8 39 4 18 39 54 4 38 37 48 - 34 0 0 39 52 3 20 13 11 38 95 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58 7 49 152 0 0 58 20 17 19 57 13 0 310 -8 58 32 0 58 8 36 58 59 37 .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 1181-00217-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 09 58.4021 DE: +19 48 20.017 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .023 ) * V mag [mag]: 12.0 * B mag [mag]: 13.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1098) Hakone approx. diameter [km]: 25 approx. diameter ["]: .023 distance from Earth [AU]: 1.48600 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 940 number of rejected observations: 55 time covered by the observations: 1926 Mar 12 - 2012 Sep 29 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.015, 53° remarks: * orbital elements for (1098) Hakone : Mean anomaly = 336.67881816 deg Arg. of pericenter = 81.57143137 deg Long. of node = 329.07094792 deg Inclination = 13.37003880 deg Eccentricity = 0.11870858 Semimajor axis = 2.68819764 AU Perihelion dist = 2.36908551 AU Mag: H = 10.36, G = 0.15 Epoch of elements : MJD 56227.83900000 TDT (2012 Oct 27.839) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 27 1098 Hakone 20h 7.4m UT 12.0 0 9 58.402 19 48 20.02TYC 1181-00217-1 13.2 13.9 25 3.2 1.486 -1.690 -9.87 24.0571 19.809 -125.89 -13.13 20.1235 -0.25509 0.61690 -4.03406 -1.66866 0.00275 -0.00041 2000 334.92585420121020.00000 81.571431329.070948 13.3700390.11870858 2.6881976 2.369085510.4 5.00.15 RATE 2.2362090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.027 68 2.17 0.027 0 0 1-3 056208.0020121027_0217-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org