IOTA/IOTA-ES occultation update for (331) Etheridgea / TYC 6375-00933-1 event on 2009 Aug 06, 07:35 UT Visible from Summary ------- On 2009 Aug 06 UT, the 75 km diameter asteroid (331) Etheridgea will occult a 11.0 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 13.4 mag (the magnitude of the asteroid) for at most 7.2 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: 82 * date and approx. time of event: 2009 Aug 06, 07:26 - 2009 Aug 06, 07:43 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 7.2 * Moon: 100 % sunlit, 12° distance * Sun: 168° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 90 * 1 sigma uncertainty interval [path widths]: +/- 0.64 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .038", 72° ) * approx speed of asteroid's shadow [km/s]: 10.4595 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6375-00933-1 by 331 Etheridgea on 2009 Aug 6 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 173 0 0 14 51 43 7 43 45 0 113 -12 15 18 35 14 25 0 .. .. .. .. .. .. 174 0 0 14 27 23 7 43 45 1 113 -13 14 54 10 14 0 46 15 28 40 .. .. .. 175 0 0 14 3 35 7 43 44 2 113 -14 14 30 16 13 37 3 15 4 38 .. .. .. 176 0 0 13 40 18 7 43 44 3 114 -15 14 6 53 13 13 51 14 41 8 12 40 14 177 0 0 13 17 32 7 43 43 4 114 -16 13 44 2 12 51 11 14 18 10 12 17 40 178 0 0 12 55 19 7 43 42 5 114 -17 13 21 43 12 29 3 13 55 44 11 55 39 179 0 0 12 33 37 7 43 40 6 114 -18 12 59 56 12 7 27 13 33 51 11 34 10 180 0 0 12 12 29 7 43 39 8 115 -19 12 38 42 11 46 24 13 12 30 11 13 12 -179 0 0 11 51 53 7 43 37 9 115 -20 12 18 1 11 25 52 12 51 42 10 52 48 -178 0 0 11 31 49 7 43 35 10 115 -21 11 57 53 11 5 54 12 31 27 10 32 55 -177 0 0 11 12 19 7 43 32 11 115 -22 11 38 18 10 46 29 12 11 46 10 13 36 -176 0 0 10 53 22 7 43 30 12 116 -23 11 19 16 10 27 36 11 52 38 9 54 49 -175 0 0 10 34 58 7 43 27 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34 30 47 7 27 41 21 221 -19 35 0 29 34 1 18 35 38 49 33 23 51 - 57 0 0 35 3 37 7 27 37 20 222 -18 35 33 22 34 34 6 36 11 45 33 56 35 - 56 0 0 35 36 22 7 27 33 19 222 -17 36 6 9 35 6 49 36 44 35 34 29 16 - 55 0 0 36 9 1 7 27 29 18 223 -16 36 38 50 35 39 26 37 17 18 35 1 50 - 54 0 0 36 41 33 7 27 25 17 224 -15 37 11 23 36 11 56 37 49 54 35 34 18 - 53 0 0 37 13 57 7 27 21 16 224 -14 37 43 49 36 44 18 38 22 21 36 6 39 - 52 0 0 37 46 12 7 27 18 16 225 -13 38 16 4 37 16 31 38 54 38 36 38 51 - 51 0 0 38 18 16 7 27 15 15 226 -12 38 48 10 37 48 35 39 26 45 37 10 53 - 50 0 0 38 50 9 7 27 12 14 226 -11 39 20 4 38 20 28 39 58 39 37 42 45 - 49 0 0 39 21 51 7 27 9 13 227 -10 39 51 45 38 52 9 40 30 21 38 14 25 - 48 0 0 39 53 19 7 27 7 12 228 -9 40 23 13 39 23 37 41 1 50 38 45 53 - 47 0 0 40 24 33 7 27 5 11 228 -8 40 54 27 39 54 51 41 33 4 39 17 8 - 46 0 0 40 55 32 7 27 2 10 229 -7 41 25 26 40 25 51 42 4 2 39 48 8 - 45 0 0 41 26 16 7 27 1 9 230 -6 41 56 9 40 56 35 42 34 44 40 18 53 - 44 0 0 41 56 43 7 26 59 8 230 -6 42 26 35 41 27 3 43 5 9 40 49 22 - 43 0 0 42 26 53 7 26 57 7 231 -5 42 56 44 41 57 14 43 35 16 41 19 35 - 42 0 0 42 56 44 7 26 56 6 232 -4 43 26 34 42 27 7 44 5 4 41 49 30 - 41 0 0 43 26 17 7 26 55 6 232 -3 43 56 5 42 56 42 44 34 32 42 19 7 - 40 0 0 43 55 30 7 26 54 5 233 -2 44 25 16 43 25 57 45 3 41 42 48 24 - 39 0 0 44 24 23 7 26 53 4 234 -1 44 54 7 43 54 52 45 32 28 43 17 22 - 38 0 0 44 52 56 7 26 52 3 234 0 45 22 37 44 23 27 46 0 55 43 46 0 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6375-00933-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 49 22.0573 DE: -22 10 08.362 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .032 ) * V mag [mag]: 11.0 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (331) Etheridgea approx. diameter [km]: 75 approx. diameter ["]: .059 distance from Earth [AU]: 1.76600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 866 number of rejected observations: 85 time covered by the observations: 1904 Sep 10 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.043, 0.021, 67° remarks: * orbital elements for (331) Etheridgea : Mean anomaly = 329.70173425 deg Arg. of pericenter = 333.81231786 deg Long. of node = 22.08709692 deg Inclination = 6.05063566 deg Eccentricity = 0.10333624 Semimajor axis = 3.02684128 AU Perihelion dist = 2.71405887 AU Mag: H = 9.61, G = 0.15 Epoch of elements : MJD 55049.31600000 TDT (2009 Aug 06.316) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 6 331 Etheridgea 7h 35.3m UT 11.0 21 49 22.057-22 10 8.36TYC 6375-00933-1 11.8 13.4 75 7.2 1.766 -2.018 -8.89 -101.4583 -22.166 67.66 16.63 7.5882 -0.16757 0.52856 -5.62701 -1.78591 -0.00102 0.00049 2000 327.9581252009 728.00000333.812318 22.087097 6.0506360.10333624 3.0268413 2.7140589 9.6 5.00.15 RATE 1.8716280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.038 72 1.64 0.038 0 54545.5020090806_0933-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org