IOTA/IOTA-ES occultation update for (217) Eudora / TYC 0097-00055-1 event on 2012 Nov 22, 13:01 UT Visible from New Zealand Summary ------- On 2012 Nov 22 UT, the 68 km diameter asteroid (217) Eudora will occult a 11.3 mag star in the constellation Orion for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.2 mag (the magnitude of the asteroid) for at most 5.0 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: 61 * date and approx. time of event: 2012 Nov 22, 12:57 - 2012 Nov 22, 13:06 UT * geocentric midpoint of event [JD]: 2456254.04275 * magnitude of target star: 11.3 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 5.0 * Moon: 70 % sunlit, 82° distance * Sun: 159° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 1.00 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .043", 359° ) * approx speed of asteroid's shadow [km/s]: 13.5481 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0097-00055-1 by 217 Eudora on 2012 Nov 22 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 106 0 0 -57 55 28 13 6 44 4 69 0 -57 26 47 -58 24 25 .. .. .. -59 23 12 107 0 0 -57 46 20 13 6 44 5 69 -1 -57 17 37 -58 15 19 -56 21 1 -59 14 10 108 0 0 -57 37 1 13 6 43 5 68 -1 -57 8 17 -58 6 2 -56 11 37 -59 4 58 109 0 0 -57 27 33 13 6 42 6 67 -2 -56 58 47 -57 56 36 -56 2 3 -58 55 36 110 0 0 -57 17 55 13 6 42 6 66 -2 -56 49 6 -57 47 0 -55 52 19 -58 46 4 111 0 0 -57 8 6 13 6 41 7 65 -3 -56 39 16 -57 37 13 -55 42 25 -58 36 21 112 0 0 -56 58 8 13 6 40 8 64 -3 -56 29 16 -57 27 17 -55 32 22 -58 26 29 113 0 0 -56 48 0 13 6 39 8 64 -4 -56 19 6 -57 17 11 -55 22 8 -58 16 27 114 0 0 -56 37 42 13 6 38 9 63 -4 -56 8 47 -57 6 55 -55 11 45 -58 6 15 115 0 0 -56 27 15 13 6 37 9 62 -5 -55 58 18 -56 56 30 -55 1 13 -57 55 53 116 0 0 -56 16 38 13 6 36 10 61 -5 -55 47 39 -56 45 55 -54 50 31 -57 45 22 117 0 0 -56 5 52 13 6 34 10 60 -6 -55 36 51 -56 35 10 -54 39 40 -57 34 41 118 0 0 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29 10 -33 39 22 -36 25 34 Uncertainty in time = +/- 5 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0097-00055-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 58 18.5783 DE: +07 07 15.536 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .037, .045 ) * V mag [mag]: 11.3 * B mag [mag]: 12.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (217) Eudora approx. diameter [km]: 68 approx. diameter ["]: .047 distance from Earth [AU]: 1.99900 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1190 number of rejected observations: 55 time covered by the observations: 1904 Jun 14 - 2012 Nov 13 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 82° remarks: * orbital elements for (217) Eudora : Mean anomaly = 76.97792676 deg Arg. of pericenter = 154.79421986 deg Long. of node = 162.97725911 deg Inclination = 10.45515429 deg Eccentricity = 0.30391731 Semimajor axis = 2.87837260 AU Perihelion dist = 2.00358535 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 56253.54200000 TDT (2012 Nov 22.542) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 22 217 Eudora 13h 1.6m UT 11.3 4 58 18.578 7 7 15.54TYC 0097-00055-1 12.0 14.2 68 5.0 1.999 -2.216 -6.60 177.2676 7.122 -18.82 -20.28 13.0260 0.14615 -0.73017 -7.49823 -1.50078 -0.00153 0.00138 2000 76.26304920121119.00000154.794220162.977259 10.4551540.30391731 2.8783726 2.0035853 9.8 5.00.15 RATE 2.0182900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.043 359 2.00 0.047 0 0 3-4 056247.0020121122_0055-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org