IOTA/IOTA-ES occultation update for (412) Elisabetha / TYC 4697-00156-1 event on 2009 Oct 03, 19:42 UT Visible from Summary ------- On 2009 Oct 03 UT, the 91 km diameter asteroid (412) Elisabetha will occult a 10.4 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 13.4 mag (the magnitude of the asteroid) for at most 8.2 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: 96 * date and approx. time of event: 2009 Oct 03, 19:35 - 2009 Oct 03, 19:50 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 8.2 * Moon: 100 % sunlit, 35° distance * Sun: 151° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 105 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .025", 79° ) * approx speed of asteroid's shadow [km/s]: 11.1581 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4697-00156-1 by 412 Elisabetha on 2009 Oct 3 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 - 16 0 0 -60 55 28 19 50 24 0 104 -3 .. .. .. -61 24 41 .. .. .. -61 49 22 - 15 0 0 -61 2 41 19 50 24 1 103 -4 -60 33 41 -61 31 51 -60 9 25 -61 56 27 - 14 0 0 -61 9 35 19 50 24 1 102 -4 -60 40 38 -61 38 40 -60 16 25 -62 3 13 - 13 0 0 -61 16 7 19 50 24 2 102 -5 -60 47 15 -61 45 9 -60 23 5 -62 9 39 - 12 0 0 -61 22 20 19 50 23 2 101 -5 -60 53 31 -61 51 18 -60 29 25 -62 15 44 - 11 0 0 -61 28 13 19 50 23 3 100 -5 -60 59 27 -61 57 7 -60 35 24 -62 21 31 - 10 0 0 -61 33 46 19 50 23 3 99 -6 -61 5 4 -62 2 37 -60 41 3 -62 26 58 - 9 0 0 -61 39 0 19 50 23 4 98 -6 -61 10 20 -62 7 47 -60 46 23 -62 32 5 - 8 0 0 -61 43 54 19 50 22 4 97 -7 -61 15 18 -62 12 39 -60 51 22 -62 36 54 - 7 0 0 -61 48 29 19 50 22 4 96 -7 -61 19 56 -62 17 11 -60 56 2 -62 41 24 - 6 0 0 -61 52 45 19 50 21 5 95 -7 -61 24 14 -62 21 25 -61 0 23 -62 45 36 - 5 0 0 -61 56 43 19 50 21 5 94 -8 -61 28 14 -62 25 20 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29 19 36 17 37 269 -9 - 9 35 57 -10 39 12 - 9 9 36 -11 5 59 144 0 0 - 9 38 7 19 36 9 36 268 -8 - 9 6 42 -10 9 43 - 8 40 27 -10 36 24 145 0 0 - 9 9 16 19 36 2 36 268 -7 - 8 37 58 - 9 40 45 - 8 11 48 -10 7 20 146 0 0 - 8 40 56 19 35 55 35 267 -7 - 8 9 45 - 9 12 18 - 7 43 41 - 9 38 47 147 0 0 - 8 13 8 19 35 48 34 267 -6 - 7 42 3 - 8 44 23 - 7 16 5 - 9 10 46 148 0 0 - 7 45 52 19 35 42 33 267 -5 - 7 14 54 - 8 17 0 - 6 49 1 - 8 43 17 149 0 0 - 7 19 8 19 35 35 32 266 -4 - 6 48 17 - 7 50 10 - 6 22 29 - 8 16 21 150 0 0 - 6 52 57 19 35 29 31 266 -3 - 6 22 12 - 7 23 52 - 5 56 30 - 7 49 58 151 0 0 - 6 27 20 19 35 23 30 266 -2 - 5 56 42 - 6 58 8 - 5 31 5 - 7 24 9 152 0 0 - 6 2 16 19 35 17 29 265 -1 - 5 31 44 - 6 32 58 - 5 6 13 - 6 58 54 153 0 0 - 5 37 47 19 35 11 28 265 0 - 5 7 21 - 6 8 23 - 4 41 55 - 6 34 13 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 4697-00156-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 25 57.5640 DE: -06 58 33.812 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .020 ) * V mag [mag]: 10.4 * B mag [mag]: 11.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (412) Elisabetha approx. diameter [km]: 91 approx. diameter ["]: .064 distance from Earth [AU]: 1.96400 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 781 number of rejected observations: 77 time covered by the observations: 1927 Dec 30 - 2007 Jun 14 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.015, 65° remarks: * orbital elements for (412) Elisabetha : Mean anomaly = 182.89985401 deg Arg. of pericenter = 94.89331390 deg Long. of node = 106.54431782 deg Inclination = 13.77749028 deg Eccentricity = 0.04301944 Semimajor axis = 2.76171865 AU Perihelion dist = 2.64291106 AU Mag: H = 9.07, G = 0.15 Epoch of elements : MJD 55107.82100000 TDT (2009 Oct 03.821) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 3 412 Elisabetha 19h 42.2m UT 10.4 2 25 57.564- 6 58 33.81TYC 4697-00156-1 11.0 13.4 91 8.2 1.964 -1.616 -14.74 88.3064 -6.972 -118.32 -4.25 19.7027 0.26097 -0.42477 -5.36882 -3.29234 -0.00257 0.00104 2000 181.2202872009 926.00000 94.893314106.544318 13.7774900.04301944 2.7617187 2.6429111 9.0 5.00.15 RATE 2.1475090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.025 79 1.42 0.027 0 54545.5020091003_0156-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org