IOTA/IOTA-ES occultation update for (3471) Amelin / HIP 59803 event on 2009 Apr 12, 02:44 UT Visible from Venezuela, Colombia, Central America, Mexico Summary ------- On 2009 Apr 12 UT, the 30 km diameter asteroid (3471) Amelin will occult a 2.5 mag star in the constellation Corvus for observers along a path across Venezuela, Colombia, Central America, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 13.3 mag to 15.8 mag (the magnitude of the asteroid) for at most 2.3 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: . The event at a glimpse ---------------------- * Rank: 20 * date and approx. time of event: 2009 Apr 12, 02:36 - 2009 Apr 12, 02:52 UT * magnitude of target star: 2.5 * magnitude drop [mag]: 13.3 * estimated maximum duration [s]: 2.3 * Moon: 94 % sunlit, 41° distance * Sun: 162° distance * rough path description: Venezuela, Colombia, Central America, Mexico The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 3.39 * 1 sigma uncertainty interval [seconds]: +/- 11.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .090 +/- .079) * 1 sigma uncertainty ellipse (major, minor, PA): ( .106", .056", 128° ) * approx speed of asteroid's shadow [km/s]: 12.6097 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 59803 by 3471 Amelin on 2009 Apr 12 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 -127 0 0 30 34 53 2 52 16 9 117 -1 30 44 29 30 25 18 31 49 51 29 20 39 -126 0 0 30 12 56 2 52 15 10 117 -2 30 22 32 30 3 20 31 27 58 28 58 38 -125 0 0 29 50 47 2 52 13 11 118 -2 30 0 24 29 41 11 31 5 53 28 36 26 -124 0 0 29 28 28 2 52 11 12 118 -3 29 38 5 29 18 51 30 43 36 28 14 3 -123 0 0 29 5 58 2 52 9 13 119 -4 29 15 35 28 56 21 30 21 10 27 51 31 -122 0 0 28 43 18 2 52 7 14 119 -5 28 52 56 28 33 41 29 58 33 27 28 48 -121 0 0 28 20 29 2 52 5 15 120 -6 28 30 7 28 10 52 29 35 46 27 5 57 -120 0 0 27 57 31 2 52 3 16 120 -7 28 7 9 27 47 54 29 12 50 26 42 57 -119 0 0 27 34 25 2 52 0 17 121 -8 27 44 3 27 24 47 28 49 46 26 19 49 -118 0 0 27 11 10 2 51 57 18 121 -9 27 20 49 27 1 32 28 26 33 25 56 33 -117 0 0 26 47 49 2 51 55 19 122 -10 26 57 27 26 38 10 28 3 12 25 33 10 -116 0 0 26 24 20 2 51 52 20 122 -11 26 33 59 26 14 42 27 39 45 25 9 40 -115 0 0 26 0 45 2 51 48 21 123 -12 26 10 24 25 51 7 27 16 11 24 46 5 -114 0 0 25 37 4 2 51 45 22 123 -13 25 46 43 25 27 26 26 52 30 24 22 23 -113 0 0 25 13 18 2 51 42 23 124 -14 25 22 57 25 3 40 26 28 45 23 58 37 -112 0 0 24 49 28 2 51 38 23 124 -15 24 59 7 24 39 49 26 4 54 23 34 47 -111 0 0 24 25 33 2 51 34 24 125 -16 24 35 12 24 15 54 25 40 59 23 10 52 -110 0 0 24 1 34 2 51 30 25 125 -17 24 11 13 23 51 56 25 17 0 22 46 54 -109 0 0 23 37 33 2 51 26 26 126 -18 23 47 12 23 27 55 24 52 57 22 22 54 -108 0 0 23 13 29 2 51 22 27 126 -19 23 23 8 23 3 51 24 28 52 21 58 51 -107 0 0 22 49 24 2 51 17 28 127 -20 22 59 2 22 39 46 24 4 45 21 34 47 -106 0 0 22 25 17 2 51 13 29 127 -21 22 34 55 22 15 39 23 40 37 21 10 42 -105 0 0 22 1 9 2 51 8 30 128 -22 22 10 47 21 51 32 23 16 27 20 46 36 -104 0 0 21 37 1 2 51 3 31 128 -23 21 46 39 21 27 24 22 52 17 20 22 30 -103 0 0 21 12 54 2 50 58 32 129 -24 21 22 32 21 3 17 22 28 7 19 58 26 -102 0 0 20 48 48 2 50 53 33 129 -25 20 58 25 20 39 11 22 3 58 19 34 22 -101 0 0 20 24 43 2 50 48 34 130 -26 20 34 20 20 15 7 21 39 51 19 10 20 -100 0 0 20 0 41 2 50 43 35 130 -27 20 10 17 19 51 5 21 15 46 18 46 21 - 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Uncertainty in time = +/- 13 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 59803 * constellation : Corvus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 15 48.2675 DE: -17 32 30.750 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .003, .002 ) * V mag [mag]: 2.5 * B mag [mag]: 2.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3471) Amelin approx. diameter [km]: 30 approx. diameter ["]: .020 distance from Earth [AU]: 2.11900 * orbital information: orbit source: Preston date of fit: 2008 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 622 number of rejected observations: 3 time covered by the observations: 1958 Apr 19 - 2008 May 14 1 sigma uncertainty ellipse (major, minor, PA): 0.106, 0.056, 128° remarks: * orbital elements for (3471) Amelin : Mean anomaly = 52.16645471 deg Arg. of pericenter = 162.90493959 deg Long. of node = 335.12806487 deg Inclination = 15.38443518 deg Eccentricity = 0.05632562 Semimajor axis = 3.18974841 AU Perihelion dist = 3.01008387 AU Mag: H = 11.29, G = 0.15 Epoch of elements : MJD 54933.11400000 TDT (2009 Apr 12.114) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 12 3471 Amelin 2h 44.6m UT 2.5 12 15 48.268-17 32 30.75HIP 59803 2.5 15.8 30 2.3 2.119 -2.009 6.82 -57.6448 -17.543 139.06 8.70 2.7435 0.08791 0.37170 -6.92500 1.64315 0.00161 0.00083 2000 51.6277042009 4 9.00000162.904940335.128065 15.3844350.05632562 3.1897484 3.010083911.3 5.00.15 RATE 1.7300930 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.106 0.056 128 4.39 0.066 0 54786.5020090412__59803 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 16:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org