IOTA/IOTA-ES occultation update for (2889) Brno / HIP 111779 event on 2012 Sep 30, 08:38 UT Visible from Central America Summary ------- On 2012 Sep 30 UT, the 20 km diameter asteroid (2889) Brno will occult a 9.1 mag star in the constellation Pegasus for observers along a path across Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.4 mag to 15.5 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: UCAC. The event at a glimpse ---------------------- * Rank: 22 * date and approx. time of event: 2012 Sep 30, 08:28 - 2012 Sep 30, 08:48 UT * geocentric midpoint of event [JD]: 2456200.86002083 * magnitude of target star: 9.1 * magnitude drop [mag]: 6.4 * estimated maximum duration [s]: 2.3 * Moon: 100 % sunlit, 28° distance * Sun: 153° distance * rough path description: Central America The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 3.05 * 1 sigma uncertainty interval [seconds]: +/- 8.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .046) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .044", 72° ) * approx speed of asteroid's shadow [km/s]: 8.8116 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 111779 by 2889 Brno on 2012 Sep 30 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 164 0 0 -83 38 51 8 48 1 2 34 0 -83 27 17 -83 50 28 .. .. .. -85 2 27 165 0 0 -83 29 19 8 48 1 2 33 0 -83 17 30 -83 41 11 .. .. .. -84 54 45 166 0 0 -83 19 15 8 48 1 2 32 0 -83 7 11 -83 31 22 -81 54 43 -84 46 36 167 0 0 -83 8 35 8 48 1 2 31 -1 -82 56 14 -83 20 58 -81 42 14 -84 37 57 168 0 0 -82 57 16 8 48 1 3 30 -1 -82 44 39 -83 9 57 -81 29 2 -84 28 45 169 0 0 -82 45 17 8 48 1 3 29 -1 -82 32 22 -82 58 15 -81 15 5 -84 18 57 170 0 0 -82 32 33 8 48 0 3 28 -1 -82 19 20 -82 45 49 -81 0 18 -84 8 32 171 0 0 -82 19 1 8 48 0 3 27 -1 -82 5 29 -82 32 37 -80 44 38 -83 57 24 172 0 0 -82 4 37 8 48 0 4 26 -2 -81 50 46 -82 18 33 -80 28 2 -83 45 32 173 0 0 -81 49 18 8 47 59 4 25 -2 -81 35 6 -82 3 35 -80 10 25 -83 32 50 174 0 0 -81 32 58 8 47 59 4 24 -2 -81 18 25 -81 47 37 -79 51 43 -83 19 15 175 0 0 -81 15 32 8 47 59 5 23 -3 -81 0 37 -81 30 34 -79 31 50 -83 4 41 176 0 0 -80 56 56 8 47 58 5 22 -3 -80 41 38 -81 12 21 -79 10 42 -82 49 3 177 0 0 -80 37 3 8 47 58 5 21 -3 -80 21 22 -80 52 52 -78 48 14 -82 32 15 178 0 0 -80 15 47 8 47 57 6 20 -4 -79 59 42 -80 32 1 -78 24 18 -82 14 11 179 0 0 -79 53 1 8 47 56 6 19 -4 -79 36 31 -80 9 40 -77 58 49 -81 54 42 180 0 0 -79 28 38 8 47 56 7 18 -4 -79 11 43 -79 45 43 -77 31 40 -81 33 42 -179 0 0 -79 2 30 8 47 55 7 17 -5 -78 45 9 -79 20 1 -77 2 44 -81 11 1 -178 0 0 -78 34 28 8 47 54 8 16 -5 -78 16 41 -78 52 26 -76 31 54 -80 46 30 -177 0 0 -78 4 24 8 47 53 8 15 -6 -77 46 11 -78 22 49 -75 59 2 -80 19 58 -176 0 0 -77 32 9 8 47 51 9 15 -6 -77 13 30 -77 51 0 -75 24 1 -79 51 16 -175 0 0 -76 57 33 8 47 50 9 14 -7 -76 38 29 -77 16 51 -74 46 44 -79 20 10 -174 0 0 -76 20 26 8 47 48 10 13 -8 -76 0 58 -76 40 10 -74 7 2 -78 46 30 -173 0 0 -75 40 41 8 47 46 11 12 -8 -75 20 49 -76 0 49 -73 24 48 -78 10 3 -172 0 0 -74 58 7 8 47 44 11 11 -9 -74 37 53 -75 18 37 -72 39 56 -77 30 36 -171 0 0 -74 12 36 8 47 41 12 10 -10 -73 52 2 -74 33 27 -71 52 20 -76 47 57 -170 0 0 -73 24 1 8 47 38 13 9 -11 -73 3 10 -73 45 11 -71 1 55 -76 1 56 -169 0 0 -72 32 15 8 47 35 14 8 -11 -72 11 9 -72 53 41 -70 8 36 -75 12 22 -168 0 0 -71 37 14 8 47 31 15 7 -12 -71 15 56 -71 58 52 -69 12 21 -74 19 8 -167 0 0 -70 38 55 8 47 27 16 6 -13 -70 17 29 -71 0 43 -68 13 10 -73 22 7 -166 0 0 -69 37 18 8 47 22 17 5 -14 -69 15 46 -69 59 11 -67 11 2 -72 21 16 -165 0 0 -68 32 24 8 47 16 18 4 -15 -68 10 51 -68 54 18 -66 6 1 -71 16 36 -164 0 0 -67 24 18 8 47 10 19 3 -17 -67 2 47 -67 46 9 -64 58 10 -70 8 11 -163 0 0 -66 13 5 8 47 4 20 2 -18 -65 51 40 -66 34 50 -63 47 36 -68 56 7 -162 0 0 -64 58 55 8 46 56 22 1 -19 -64 37 40 -65 20 30 -62 34 26 -67 40 36 -161 0 0 -63 41 58 8 46 48 23 360 -20 -63 20 56 -64 3 20 -61 18 51 -66 21 49 -160 0 0 -62 22 28 8 46 39 24 358 -22 -62 1 42 -62 43 34 -60 1 0 -65 0 4 -159 0 0 -61 0 38 8 46 30 26 357 -23 -60 40 10 -61 21 25 -58 41 6 -63 35 37 -158 0 0 -59 36 43 8 46 19 27 356 -25 -59 16 35 -59 57 8 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39 15 -131 0 0 -21 4 58 8 38 39 53 308 -66 -20 53 56 -21 16 3 -19 47 34 -22 24 38 -130 0 0 -19 53 20 8 38 21 53 306 -67 -19 42 30 -20 4 13 -18 37 17 -21 11 32 -129 0 0 -18 43 10 8 38 2 53 303 -68 -18 32 31 -18 53 51 -17 28 23 -19 59 58 -128 0 0 -17 34 26 8 37 44 53 301 -69 -17 23 58 -17 44 57 -16 20 54 -18 49 54 -127 0 0 -16 27 11 8 37 26 53 299 -70 -16 16 53 -16 37 31 -15 14 49 -17 41 21 -126 0 0 -15 21 23 8 37 9 52 297 -71 -15 11 15 -15 31 33 -14 10 9 -16 34 20 -125 0 0 -14 17 3 8 36 51 52 295 -72 -14 7 4 -14 27 3 -13 6 55 -15 28 49 -124 0 0 -13 14 10 8 36 34 52 293 -72 -13 4 21 -13 24 1 -12 5 5 -14 24 49 -123 0 0 -12 12 45 8 36 17 51 291 -73 -12 3 4 -12 22 27 -11 4 40 -13 22 19 -122 0 0 -11 12 46 8 36 1 51 290 -73 -11 3 14 -11 22 20 -10 5 40 -12 21 18 -121 0 0 -10 14 14 8 35 45 50 288 -73 -10 4 50 -10 23 40 - 9 8 3 -11 21 47 -120 0 0 - 9 17 8 8 35 29 50 286 -73 - 9 7 52 - 9 26 26 - 8 11 51 -10 23 44 -119 0 0 - 8 21 27 8 35 13 49 285 -73 - 8 12 19 - 8 30 38 - 7 17 2 - 9 27 8 -118 0 0 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11 11 1 19 43 -104 0 0 2 51 46 8 31 58 36 272 -64 2 59 33 2 43 59 3 46 38 1 56 9 -103 0 0 3 26 30 8 31 48 35 272 -63 3 34 12 3 18 46 4 20 55 2 31 21 -102 0 0 4 0 2 8 31 38 35 271 -62 4 7 41 3 52 23 4 54 1 3 5 21 -101 0 0 4 32 24 8 31 28 34 271 -61 4 39 59 4 24 48 5 25 57 3 38 9 -100 0 0 5 3 36 8 31 19 33 271 -60 5 11 8 4 56 4 5 56 46 4 9 46 - 99 0 0 5 33 40 8 31 10 32 271 -59 5 41 8 5 26 11 6 26 26 4 40 14 - 98 0 0 6 2 36 8 31 1 31 270 -58 6 10 1 5 55 10 6 55 0 5 9 32 - 97 0 0 6 30 24 8 30 53 30 270 -57 6 37 46 6 23 1 7 22 27 5 37 43 - 96 0 0 6 57 6 8 30 44 29 270 -56 7 4 25 6 49 46 7 48 49 6 4 46 - 95 0 0 7 22 42 8 30 37 28 270 -55 7 29 58 7 15 25 8 14 6 6 30 42 - 94 0 0 7 47 13 8 30 29 27 270 -54 7 54 27 7 39 58 8 38 18 6 55 32 - 93 0 0 8 10 40 8 30 22 26 270 -53 8 17 51 8 3 28 9 1 28 7 19 16 - 92 0 0 8 33 3 8 30 15 25 270 -52 8 40 12 8 25 53 9 23 34 7 41 56 - 91 0 0 8 54 22 8 30 8 24 270 -51 9 1 29 8 47 15 9 44 38 8 3 32 - 90 0 0 9 14 40 8 30 2 23 270 -50 9 21 44 9 7 34 10 4 40 8 24 5 - 89 0 0 9 33 55 8 29 56 22 270 -49 9 40 57 9 26 51 10 23 42 8 43 34 - 88 0 0 9 52 8 8 29 50 21 270 -48 9 59 9 9 45 7 10 41 42 9 2 1 - 87 0 0 10 9 21 8 29 44 20 270 -47 10 16 20 10 2 21 10 58 43 9 19 27 - 86 0 0 10 25 33 8 29 39 19 270 -46 10 32 31 10 18 35 11 14 43 9 35 51 - 85 0 0 10 40 45 8 29 34 18 270 -45 10 47 41 10 33 49 11 29 45 9 51 14 - 84 0 0 10 54 57 8 29 29 17 270 -44 11 1 52 10 48 2 11 43 47 10 5 36 - 83 0 0 11 8 10 8 29 24 16 270 -43 11 15 4 11 1 17 11 56 51 10 18 58 - 82 0 0 11 20 24 8 29 20 15 270 -42 11 27 16 11 13 32 12 8 56 10 31 21 - 81 0 0 11 31 40 8 29 16 14 271 -41 11 38 31 11 24 48 12 20 4 10 42 44 - 80 0 0 11 41 56 8 29 13 13 271 -40 11 48 46 11 35 6 12 30 14 10 53 8 - 79 0 0 11 51 15 8 29 9 12 271 -39 11 58 4 11 44 25 12 39 27 11 2 32 - 78 0 0 11 59 35 8 29 6 11 271 -38 12 6 24 11 52 46 12 47 42 11 10 58 - 77 0 0 12 6 58 8 29 3 11 271 -37 12 13 46 12 0 10 12 55 0 11 18 25 - 76 0 0 12 13 23 8 29 0 10 271 -36 12 20 10 12 6 35 13 1 21 11 24 54 - 75 0 0 12 18 50 8 28 58 9 272 -35 12 25 37 12 12 3 13 6 45 11 30 24 - 74 0 0 12 23 19 8 28 56 8 272 -34 12 30 6 12 16 32 13 11 13 11 34 56 - 73 0 0 12 26 51 8 28 54 7 272 -33 12 33 38 12 20 4 13 14 43 11 38 29 - 72 0 0 12 29 25 8 28 52 6 272 -32 12 36 12 12 22 39 13 17 17 11 41 4 - 71 0 0 12 31 2 8 28 51 5 272 -31 12 37 48 12 24 15 .. .. .. 11 42 40 - 70 0 0 12 31 40 8 28 50 4 273 -30 12 38 26 12 24 53 .. .. .. 11 43 17 - 69 0 0 12 31 20 8 28 49 3 273 -29 12 38 7 12 24 33 .. .. .. 11 42 56 - 68 0 0 12 30 3 8 28 48 2 273 -28 12 36 50 12 23 15 .. .. .. 11 41 35 - 67 0 0 12 27 46 8 28 48 1 273 -27 12 34 34 12 20 58 .. .. .. 11 39 16 Uncertainty in time = +/- 9 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: HIP 111779 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 38 29.7330 DE: +03 20 32.760 * position source: Pos: UCAC2, pm: UCAC2, pi:HIP2 * standard error: RA,DE ["]: ( .015, .017 ) * V mag [mag]: 9.1 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2889) Brno approx. diameter [km]: 20 approx. diameter ["]: .016 distance from Earth [AU]: 1.75500 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 893 number of rejected observations: 6 time covered by the observations: 1953 May 07 - 2012 Sep 13 1 sigma uncertainty ellipse (major, minor, PA): 0.057, 0.041, 71° remarks: * orbital elements for (2889) Brno : Mean anomaly = 6.48190307 deg Arg. of pericenter = 122.39975692 deg Long. of node = 220.62813508 deg Inclination = 9.49567955 deg Eccentricity = 0.11245687 Semimajor axis = 3.02227439 AU Perihelion dist = 2.68239887 AU Mag: H = 11.35, G = 0.15 Epoch of elements : MJD 56200.36000000 TDT (2012 Sep 30.360) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 30 2889 Brno 8h 38.4m UT 9.1 22 38 29.733 3 20 32.76HIP 111779 10.6 15.5 20 2.3 1.755 -1.084 -18.89 -159.4834 3.347 47.87 -3.01 8.6405 0.45580 -0.39149 -3.24321 -3.77063 0.00258 -0.00001 2000 6.4143722012 930.00000122.399757220.628135 9.4956800.11245687 3.0222744 2.682398911.5 5.00.15 RATE 1.8758720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.044 72 4.05 0.048 0 0 0 0 056197.0020120930_111779 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 21:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org