IOTA/IOTA-ES occultation update for (1048) Feodosia / UCAC2 18746728 event on 2008 May 02, 06:00 UT Visible from Peru, Brazil, Venezuela, Caribbean, SE USA Summary ------- On 2008 May 02 UT, the 60 km diameter asteroid (1048) Feodosia will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across Peru, Brazil, Venezuela, Caribbean, SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.3 mag (the magnitude of the asteroid) for at most 7.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 56 * date and approx. time of event: 2008 May 02, 05:48 - 2008 May 02, 06:11 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 7.8 * Moon: 14 % sunlit, 86° distance * Sun: 130° distance * rough path description: Peru, Brazil, Venezuela, Caribbean, SE USA The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 1.11 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .062 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .053", 95° ) * approx speed of asteroid's shadow [km/s]: 7.6805 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 18746728 by 1048 Feodosia on 2008 May 2 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude - 81 0 17 37 53 31 5 48 12 9 142 -36 - 80 7 49 37 22 18 - 81 57 53 38 28 43 - 78 24 6 36 22 52 - 84 38 3 40 11 35 - 77 44 56 33 12 30 5 48 30 14 144 -40 - 77 8 33 32 53 54 - 78 22 40 33 32 9 - 75 51 48 32 15 49 - 79 52 12 34 20 15 - 75 49 39 29 42 2 5 48 48 18 145 -43 - 75 19 0 29 27 57 - 76 20 59 29 56 40 - 74 13 11 28 58 30 - 77 33 23 30 31 23 - 74 28 15 26 43 42 5 49 6 21 145 -46 - 74 0 44 26 32 5 - 74 56 13 26 55 41 - 73 1 8 26 7 32 - 76 0 6 27 23 45 - 73 26 24 24 5 0 5 49 24 24 145 -48 - 73 0 54 23 54 58 - 73 52 14 24 15 19 - 72 5 24 23 33 38 - 74 50 51 24 39 16 - 72 37 29 21 39 55 5 49 42 27 145 -50 - 72 13 25 21 31 0 - 73 1 49 21 49 3 - 71 20 51 21 11 58 - 73 56 50 22 10 12 - 71 57 51 19 25 0 5 50 0 29 145 -52 - 71 34 51 19 16 55 - 72 21 5 19 33 16 - 70 44 29 18 59 37 - 73 13 26 19 52 21 - 71 25 15 17 18 3 5 50 18 31 145 -53 - 71 3 4 17 10 37 - 71 47 37 17 25 39 - 70 14 25 16 54 40 - 72 37 57 17 43 8 - 70 58 11 15 17 33 5 50 37 33 145 -55 - 70 36 39 15 10 38 - 71 19 53 15 24 36 - 69 49 23 14 55 46 - 72 8 36 15 40 49 - 70 35 38 13 22 24 5 50 55 35 144 -56 - 70 14 37 13 15 54 - 70 56 46 13 29 1 - 69 28 28 13 1 57 - 71 44 12 13 44 13 - 70 16 49 11 31 47 5 51 13 36 144 -58 - 69 56 15 11 25 39 - 70 37 30 11 38 3 - 69 11 0 11 12 26 - 71 23 53 11 52 23 - 70 1 11 9 45 4 5 51 31 38 143 -59 - 69 40 59 9 39 13 - 70 21 30 9 51 1 - 68 56 30 9 26 38 - 71 7 1 10 4 39 - 69 48 19 8 1 44 5 51 49 39 143 -60 - 69 28 24 7 56 9 - 70 8 19 8 7 26 - 68 44 33 7 44 6 - 70 53 7 8 20 27 - 69 37 51 6 21 23 5 52 7 41 142 -61 - 69 18 12 6 16 1 - 69 57 36 6 26 51 - 68 34 52 6 4 25 - 70 41 48 6 39 21 - 69 29 33 4 43 40 5 52 25 42 141 -62 - 69 10 6 4 38 29 - 69 49 5 4 48 57 - 68 27 13 4 27 18 - 70 32 46 5 1 0 - 69 23 10 3 8 19 5 52 43 44 141 -63 - 69 3 53 3 3 17 - 69 42 32 3 13 25 - 68 21 22 2 52 27 - 70 25 48 3 25 5 - 69 18 33 1 35 4 5 53 2 45 140 -64 - 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79 21 13 -42 20 38 - 80 9 54 -42 9 50 - 78 27 16 -42 32 15 - 81 4 4 -41 57 28 - 80 36 6 -43 26 12 6 3 36 56 84 -61 - 80 11 18 -43 31 43 - 81 0 55 -43 20 36 - 79 16 20 -43 43 41 - 81 56 6 -43 7 52 - 81 30 12 -44 36 55 6 3 54 55 83 -60 - 81 4 55 -44 42 37 - 81 55 30 -44 31 9 - 80 8 51 -44 54 57 - 82 51 45 -44 18 1 - 82 28 11 -45 47 25 6 4 12 54 82 -59 - 82 2 23 -45 53 18 - 82 54 0 -45 41 27 - 81 5 10 -46 6 3 - 83 51 22 -45 27 53 - 83 30 24 -46 57 38 6 4 30 53 81 -58 - 83 4 4 -47 3 44 - 83 56 45 -46 51 28 - 82 5 38 -47 16 56 - 84 55 19 -46 37 26 - 84 37 18 -48 7 34 6 4 48 52 80 -57 - 84 10 23 -48 13 52 - 85 4 13 -48 1 9 - 83 10 40 -48 27 34 - 86 4 2 -47 46 36 - 85 49 21 -49 17 7 6 5 6 51 80 -56 - 85 21 50 -49 23 41 - 86 16 52 -49 10 27 - 84 20 46 -49 37 55 - 87 17 59 -48 55 20 - 87 7 6 -50 26 13 6 5 24 50 80 -55 - 86 38 57 -50 33 4 - 87 35 14 -50 19 17 - 85 36 28 -50 47 54 - 88 37 44 -50 3 33 - 88 31 9 -51 34 48 6 5 42 49 79 -54 - 88 2 21 -51 41 56 - 88 59 57 -51 27 34 - 86 58 23 -51 57 26 - 90 3 53 -51 11 8 - 90 2 14 -52 42 43 6 6 1 48 80 -53 - 89 32 45 -52 50 12 - 90 31 43 -52 35 9 - 88 27 13 -53 6 25 - 91 37 8 -52 17 57 - 91 41 8 -53 49 51 6 6 19 47 80 -52 - 91 10 56 -53 57 41 - 92 11 19 -53 41 54 - 90 3 48 -54 14 42 - 93 18 16 -53 23 52 - 93 28 45 -54 55 59 6 6 37 46 80 -51 - 92 57 49 -55 4 14 - 93 59 40 -54 47 38 - 91 49 2 -55 22 8 - 95 8 11 -54 28 41 - 95 26 8 -56 0 55 6 6 55 45 81 -49 - 94 54 27 -56 9 36 - 95 57 46 -55 52 6 - 93 43 58 -56 28 29 - 97 7 54 -55 32 8 - 97 34 25 -57 4 20 6 7 13 43 82 -48 - 97 1 59 -57 13 32 - 98 6 48 -56 55 2 - 95 49 48 -57 33 30 - 99 18 32 -56 33 55 - 99 54 56 -58 5 55 6 7 31 42 83 -47 - 99 21 45 -58 15 39 -100 28 2 -57 56 3 - 98 7 53 -58 36 50 -101 41 20 -57 33 40 -102 29 6 -59 5 12 6 7 49 41 84 -46 -101 55 14 -59 15 33 -103 2 54 -58 54 42 -100 39 44 -59 38 5 -104 17 42 -58 30 56 -105 18 32 -60 1 39 6 8 7 39 86 -45 -104 44 1 -60 12 41 -105 52 59 -59 50 28 -103 27 1 -60 36 43 -107 9 8 -59 25 8 -108 24 57 -60 54 34 6 8 25 38 88 -43 -107 49 52 -61 6 23 -108 59 57 -60 42 37 -106 31 34 -61 32 5 -110 17 17 -60 15 32 -111 50 9 -61 43 7 6 8 44 36 90 -42 -111 14 37 -61 55 47 -112 25 33 -61 30 18 -109 55 18 -62 23 22 -113 43 47 -61 1 17 -115 35 56 -62 26 15 6 9 2 34 93 -40 -115 0 9 -62 39 52 -116 11 35 -62 12 28 -113 40 14 -63 9 32 -117 30 21 -61 41 16 -119 44 2 -63 2 38 6 9 20 33 96 -39 -119 8 13 -63 17 20 -120 19 43 -62 47 46 -117 48 14 -63 49 20 -121 38 32 -62 14 8 -124 15 57 -63 30 39 6 9 38 31 99 -37 -123 40 23 -63 46 32 -124 51 23 -63 14 34 -122 20 59 -64 21 10 -126 9 44 -62 38 11 -129 12 46 -63 48 13 6 9 56 29 103 -36 -128 37 46 -64 5 28 -129 47 41 -63 30 46 -127 19 41 -64 43 3 -131 4 59 -62 51 14 -134 35 5 -63 52 45 6 10 14 26 108 -34 -134 0 56 -64 11 34 -135 9 13 -63 33 43 -132 44 55 -64 52 30 -136 24 58 -62 50 32 -140 22 58 -63 40 49 6 10 32 24 113 -32 -139 49 51 -64 1 28 -140 56 9 -63 19 53 -138 36 28 -64 46 20 -142 10 12 -62 32 17 -146 36 23 -63 7 38 6 10 50 21 118 -30 -146 4 15 -63 30 35 -147 8 45 -62 44 18 -144 53 35 -64 20 16 -148 21 39 -61 51 0 -153 16 37 -62 5 44 6 11 8 18 123 -28 -152 44 49 -62 31 52 -153 48 56 -61 39 2 -151 35 50 -63 28 0 -155 2 56 -60 37 27 -160 30 44 -60 20 51 6 11 27 14 129 -25 -159 57 6 -60 52 16 -161 5 33 -59 48 20 -158 46 3 -61 58 41 -162 28 6 -58 31 25 -168 53 6 -57 11 36 6 11 45 9 136 -21 -168 8 27 -57 56 45 -169 42 25 -56 22 20 -166 41 0 -59 26 40 -172 0 20 -54 7 58 Uncertainty in time = +/- 9 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: UCAC2 18746728 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 06 36.9113 DE: -31 22 09.886 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .050, .050 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1048) Feodosia approx. diameter [km]: 60 approx. diameter ["]: .056 distance from Earth [AU]: 1.46600 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 805 number of rejected observations: 55 time covered by the observations: 1924 Nov 29 - 2008 Apr 16 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.020, 103° remarks: * orbital elements for (1048) Feodosia : Mean anomaly = 10.25547621 deg Arg. of pericenter = 184.30556609 deg Long. of node = 52.90277104 deg Inclination = 15.80474055 deg Eccentricity = 0.18038863 Semimajor axis = 2.73295141 AU Perihelion dist = 2.23995803 AU Mag: H = 9.64, G = 0.15 Epoch of elements : MJD 54588.25000000 TDT (2008 May 02.250) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 2 1048 Feodosia 5h 60.0m UT 11.9 18 6 36.911-31 22 9.89UCAC2 18746728 0.0 13.3 60 7.8 1.466 0.151 -25.95 -38.8651 -31.362 89.25 15.50 5.9995 -0.49661 -0.03716 0.32731 -4.32269 -0.00414 0.00044 2000 8.4557342008 424.00000184.305566 52.902771 15.8047410.18038863 2.7329514 2.2399580 9.8 5.00.15 RATE 2.1815050 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.053 95 2.11 0.063 0 54579.5020080502_746728 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 03:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org