IOTA/IOTA-ES occultation update for (185) Eunike / 2UCAC 32192143 event on 2008 Oct 13, 19:45 UT Visible from E Russia Summary ------- On 2008 Oct 13 UT, the 158 km diameter asteroid (185) Eunike will occult a 13.4 mag star in the constellation Hydra for observers along a path across E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.9 mag (the magnitude of the asteroid) for at most 7.1 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: 78 * date and approx. time of event: 2008 Oct 13, 19:41 - 2008 Oct 13, 19:43 UT * midpoint of event [JD]: 2454753.3228875 * magnitude of target star: 13.4 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 7.1 * Moon: 98 % sunlit, 118° distance * Sun: 76° distance * rough path description: E Russia The occultation path -------------------- * approximate projected width [km]: 207 * 1 sigma uncertainty interval [path widths]: +/- 0.70 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .058) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .052", 360° ) * approx speed of asteroid's shadow [km/s]: 22.3066 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 32192143 by 185 Eunike on 2008 Oct 13 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 74 0 0 59 56 45 19 41 20 0 88 -37 59 1 10 60 53 6 .. .. .. 62 13 24 75 0 0 59 57 49 19 41 20 1 89 -37 59 2 15 60 54 10 .. .. .. 62 14 25 76 0 0 59 58 40 19 41 20 1 90 -37 59 3 7 60 54 59 .. .. .. 62 15 14 77 0 0 59 59 17 19 41 20 2 91 -37 59 3 44 60 55 35 .. .. .. 62 15 49 78 0 0 59 59 40 19 41 20 2 92 -37 59 4 8 60 55 58 .. .. .. 62 16 10 79 0 0 59 59 49 19 41 20 3 92 -36 59 4 17 60 56 7 .. .. .. 62 16 19 80 0 0 59 59 44 19 41 20 3 93 -36 59 4 12 60 56 2 .. .. .. 62 16 13 81 0 0 59 59 25 19 41 21 4 94 -36 59 3 54 60 55 43 .. .. .. 62 15 55 82 0 0 59 58 53 19 41 21 4 95 -36 59 3 21 60 55 11 .. .. .. 62 15 23 83 0 0 59 58 6 19 41 21 5 96 -36 59 2 34 60 54 25 57 46 1 62 14 38 84 0 0 59 57 6 19 41 21 5 97 -35 59 1 33 60 53 25 57 44 59 62 13 40 85 0 0 59 55 52 19 41 22 6 98 -35 59 0 18 60 52 12 57 43 42 62 12 28 86 0 0 59 54 23 19 41 22 6 98 -35 58 58 48 60 50 45 57 42 12 62 11 2 87 0 0 59 52 41 19 41 22 7 99 -35 58 57 5 60 49 4 57 40 27 62 9 23 88 0 0 59 50 45 19 41 23 7 100 -35 58 55 7 60 47 9 57 38 27 62 7 31 89 0 0 59 48 35 19 41 23 8 101 -34 58 52 55 60 45 1 57 36 13 62 5 25 90 0 0 59 46 11 19 41 24 8 102 -34 58 50 29 60 42 39 57 33 44 62 3 5 91 0 0 59 43 32 19 41 24 9 103 -34 58 47 49 60 40 2 57 31 1 62 0 32 92 0 0 59 40 40 19 41 25 9 104 -33 58 44 54 60 37 12 57 28 4 61 57 46 93 0 0 59 37 33 19 41 25 10 105 -33 58 41 45 60 34 8 57 24 51 61 54 45 94 0 0 59 34 12 19 41 26 10 105 -33 58 38 22 60 30 50 57 21 24 61 51 31 95 0 0 59 30 37 19 41 27 11 106 -33 58 34 44 60 27 18 57 17 43 61 48 3 96 0 0 59 26 48 19 41 27 11 107 -32 58 30 51 60 23 31 57 13 46 61 44 21 97 0 0 59 22 44 19 41 28 12 108 -32 58 26 44 60 19 31 57 9 35 61 40 26 98 0 0 59 18 26 19 41 29 13 109 -32 58 22 23 60 15 16 57 5 9 61 36 16 99 0 0 59 13 53 19 41 29 13 110 -31 58 17 47 60 10 47 57 0 28 61 31 52 100 0 0 59 9 6 19 41 30 14 111 -31 58 12 56 60 6 3 56 55 33 61 27 15 101 0 0 59 4 4 19 41 31 14 112 -31 58 7 50 60 1 6 56 50 22 61 22 23 102 0 0 58 58 47 19 41 32 15 113 -31 58 2 29 59 55 53 56 44 56 61 17 17 103 0 0 58 53 16 19 41 33 15 113 -30 57 56 54 59 50 26 56 39 15 61 11 56 104 0 0 58 47 30 19 41 34 16 114 -30 57 51 4 59 44 45 56 33 19 61 6 21 105 0 0 58 41 29 19 41 35 16 115 -29 57 44 58 59 38 49 56 27 7 61 0 32 106 0 0 58 35 13 19 41 36 17 116 -29 57 38 38 59 32 38 56 20 40 60 54 28 107 0 0 58 28 42 19 41 37 17 117 -29 57 32 2 59 26 12 56 13 58 60 48 10 108 0 0 58 21 56 19 41 38 18 118 -28 57 25 11 59 19 31 56 7 1 60 41 37 109 0 0 58 14 55 19 41 39 18 119 -28 57 18 5 59 12 35 55 59 48 60 34 49 110 0 0 58 7 39 19 41 40 19 120 -28 57 10 43 59 5 24 55 52 19 60 27 46 111 0 0 58 0 7 19 41 41 19 121 -27 57 3 6 58 57 58 55 44 35 60 20 28 112 0 0 57 52 20 19 41 42 20 121 -27 56 55 14 58 50 17 55 36 35 60 12 55 113 0 0 57 44 18 19 41 43 20 122 -26 56 47 6 58 42 20 55 28 20 60 5 7 114 0 0 57 36 0 19 41 45 21 123 -26 56 38 42 58 34 8 55 19 48 59 57 4 115 0 0 57 27 26 19 41 46 21 124 -26 56 30 2 58 25 41 55 11 1 59 48 46 116 0 0 57 18 37 19 41 47 22 125 -25 56 21 7 58 16 58 55 1 58 59 40 12 117 0 0 57 9 32 19 41 49 22 126 -25 56 11 56 58 7 59 54 52 39 59 31 23 118 0 0 57 0 11 19 41 50 23 127 -24 56 2 29 57 58 45 54 43 3 59 22 18 119 0 0 56 50 34 19 41 52 23 128 -24 55 52 46 57 49 15 54 33 12 59 12 57 120 0 0 56 40 42 19 41 53 24 129 -24 55 42 47 57 39 29 54 23 5 59 3 21 121 0 0 56 30 33 19 41 55 25 130 -23 55 32 32 57 29 27 54 12 41 58 53 29 122 0 0 56 20 8 19 41 56 25 131 -23 55 22 1 57 19 9 54 2 1 58 43 21 123 0 0 56 9 27 19 41 58 26 132 -22 55 11 13 57 8 34 53 51 5 58 32 57 124 0 0 55 58 30 19 42 0 26 133 -22 55 0 10 56 57 44 53 39 52 58 22 17 125 0 0 55 47 17 19 42 1 27 134 -21 54 48 50 56 46 38 53 28 24 58 11 21 126 0 0 55 35 47 19 42 3 27 135 -21 54 37 13 56 35 15 53 16 38 58 0 9 127 0 0 55 24 1 19 42 5 28 136 -20 54 25 20 56 23 36 53 4 37 57 48 40 128 0 0 55 11 59 19 42 7 28 137 -20 54 13 11 56 11 41 52 52 18 57 36 55 129 0 0 54 59 40 19 42 9 29 137 -19 54 0 46 55 59 29 52 39 44 57 24 54 130 0 0 54 47 5 19 42 11 29 138 -19 53 48 4 55 47 1 52 26 53 57 12 37 131 0 0 54 34 13 19 42 13 30 139 -18 53 35 5 55 34 16 52 13 45 57 0 2 132 0 0 54 21 5 19 42 15 30 140 -18 53 21 50 55 21 15 52 0 21 56 47 12 133 0 0 54 7 40 19 42 17 31 141 -17 53 8 19 55 7 58 51 46 41 56 34 5 134 0 0 53 53 59 19 42 19 32 143 -17 52 54 31 54 54 24 51 32 44 56 20 41 135 0 0 53 40 1 19 42 21 32 144 -16 52 40 27 54 40 33 51 18 31 56 7 1 136 0 0 53 25 47 19 42 24 33 145 -15 52 26 6 54 26 26 51 4 1 55 53 4 137 0 0 53 11 17 19 42 26 33 146 -15 52 11 29 54 12 2 50 49 15 55 38 51 138 0 0 52 56 30 19 42 28 34 147 -14 51 56 35 53 57 22 50 34 13 55 24 21 139 0 0 52 41 27 19 42 31 34 148 -14 51 41 25 53 42 26 50 18 54 55 9 35 140 0 0 52 26 7 19 42 33 35 149 -13 51 25 59 53 27 13 50 3 20 54 54 32 141 0 0 52 10 31 19 42 36 35 150 -12 51 10 17 53 11 44 49 47 29 54 39 13 142 0 0 51 54 39 19 42 38 36 151 -12 50 54 19 52 55 59 49 31 23 54 23 37 143 0 0 51 38 31 19 42 41 36 152 -11 50 38 5 52 39 57 49 15 1 54 7 45 144 0 0 51 22 7 19 42 44 37 153 -11 50 21 35 52 23 39 48 58 23 53 51 36 145 0 0 51 5 28 19 42 46 38 154 -10 50 4 49 52 7 6 48 41 29 53 35 12 146 0 0 50 48 32 19 42 49 38 155 -9 49 47 48 51 50 16 48 24 21 53 18 31 147 0 0 50 31 21 19 42 52 39 157 -9 49 30 32 51 33 11 48 6 56 53 1 35 148 0 0 50 13 55 19 42 55 39 158 -8 49 13 0 51 15 50 47 49 17 52 44 23 149 0 0 49 56 13 19 42 58 40 159 -7 48 55 13 50 58 14 47 31 23 52 26 55 150 0 0 49 38 16 19 43 1 40 160 -7 48 37 11 50 40 23 47 13 15 52 9 11 151 0 0 49 20 5 19 43 4 41 161 -6 48 18 55 50 22 16 46 54 52 51 51 13 152 0 0 49 1 39 19 43 7 41 163 -5 48 0 24 50 3 55 46 36 15 51 32 59 153 0 0 48 42 58 19 43 10 42 164 -5 47 41 39 49 45 19 46 17 24 51 14 30 154 0 0 48 24 3 19 43 14 42 165 -4 47 22 40 49 26 29 45 58 19 50 55 47 155 0 0 48 4 55 19 43 17 43 166 -3 47 3 27 49 7 25 45 39 1 50 36 49 156 0 0 47 45 33 19 43 20 43 168 -2 46 44 1 48 48 7 45 19 30 50 17 37 157 0 0 47 25 58 19 43 24 43 169 -2 46 24 22 48 28 36 44 59 46 49 58 11 158 0 0 47 6 9 19 43 27 44 170 -1 46 4 30 48 8 51 44 39 49 49 38 32 159 0 0 46 46 8 19 43 31 44 172 0 45 44 26 47 48 53 44 19 41 49 18 39 Uncertainty in time = +/- 5 secs [Prediction of 2008 Sep 11.0] Data for the target star ------------------------ * name: 2UCAC 32192143 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 13 28.2163 DE: +01 21 02.800 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .050, .057 ) * V mag [mag]: 13.4 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 123.4829338666 DE(deg): 1.3268082802 * Equation of equinoxes (radians) : 0.000047733752546 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (185) Eunike approx. diameter [km]: 158 approx. diameter ["]: .081 distance from Earth [AU]: 2.70600 * orbital information: orbit source: Preston date of fit: 2008 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1293 number of rejected observations: 142 time covered by the observations: 1905 Mar 13 - 2008 Jan 11 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.007, 80° remarks: * orbital elements for (185) Eunike : Mean anomaly = 67.93490627 deg Arg. of pericenter = 224.29749743 deg Long. of node = 153.92970393 deg Inclination = 23.22282405 deg Eccentricity = 0.12750783 Semimajor axis = 2.73966921 AU Perihelion dist = 2.39033993 AU Mag: H = 7.62, G = 0.15 Epoch of elements : MJD 54752.82300000 TDT (2008 Oct 13.823) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 13 185 Eunike 19h 45.0m UT 13.4 8 13 28.216 1 21 2.802UCAC 32192143 0.0 12.9 158 7.1 2.706 2.572 -13.67 164.3893 1.355 -119.72 -8.14 19.7493 0.21624 0.60755 11.86770 -4.20449 -0.00547 0.00083 2000 67.32133120081011.00000224.297497153.929704 23.2228240.12750783 2.7396692 2.3903399 7.6 5.00.15 RATE 2.1734860 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.052 360 1.70 0.057 0 54720.5020081013_192143 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 17:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org