IOTA/IOTA-ES occultation update for (371) Bohemia / TYC 4924-01120-1 event on 2009 Jun 06, 12:02 UT Visible from Summary ------- On 2009 Jun 06 UT, the 55 km diameter asteroid (371) Bohemia will occult a 12.1 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.8 mag (the magnitude of the asteroid) for at most 3.7 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: 60 * date and approx. time of event: 2009 Jun 06, 12:03 - 2009 Jun 06, 12:10 UT * magnitude of target star: 12.1 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 3.7 * Moon: 98 % sunlit, 72° distance * Sun: 94° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 1.02 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .033", 99° ) * approx speed of asteroid's shadow [km/s]: 14.7400 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4924-01120-1 by 371 Bohemia on 2009 Jun 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 89 0 0 - 1 33 45 12 3 3 87 127 -1 - 1 48 59 - 1 18 31 - 2 20 2 - 0 47 27 90 0 0 - 1 45 56 12 3 10 88 139 -2 - 2 1 9 - 1 30 42 - 2 32 13 - 0 59 38 91 0 0 - 1 58 3 12 3 18 88 162 -3 - 2 13 16 - 1 42 49 - 2 44 19 - 1 11 46 92 0 0 - 2 10 6 12 3 26 89 202 -4 - 2 25 19 - 1 54 52 - 2 56 21 - 1 23 49 93 0 0 - 2 22 4 12 3 34 88 234 -5 - 2 37 17 - 2 6 51 - 3 8 19 - 1 35 48 94 0 0 - 2 33 57 12 3 42 87 250 -6 - 2 49 10 - 2 18 45 - 3 20 12 - 1 47 42 95 0 0 - 2 45 46 12 3 50 86 258 -7 - 3 0 58 - 2 30 33 - 3 31 59 - 1 59 31 96 0 0 - 2 57 29 12 3 58 85 263 -8 - 3 12 41 - 2 42 17 - 3 43 42 - 2 11 15 97 0 0 - 3 9 7 12 4 6 84 266 -9 - 3 24 19 - 2 53 55 - 3 55 19 - 2 22 54 98 0 0 - 3 20 39 12 4 14 83 268 -10 - 3 35 51 - 3 5 27 - 4 6 50 - 2 34 27 99 0 0 - 3 32 5 12 4 22 82 270 -11 - 3 47 16 - 3 16 54 - 4 18 15 - 2 45 54 100 0 0 - 3 43 25 12 4 29 81 271 -12 - 3 58 36 - 3 28 14 - 4 29 34 - 2 57 14 101 0 0 - 3 54 38 12 4 37 80 272 -13 - 4 9 49 - 3 39 27 - 4 40 47 - 3 8 29 102 0 0 - 4 5 45 12 4 45 79 273 -14 - 4 20 56 - 3 50 34 - 4 51 53 - 3 19 36 103 0 0 - 4 16 45 12 4 53 78 273 -15 - 4 31 55 - 4 1 35 - 5 2 52 - 3 30 37 104 0 0 - 4 27 38 12 5 1 77 274 -16 - 4 42 48 - 4 12 28 - 5 13 43 - 3 41 31 105 0 0 - 4 38 23 12 5 8 76 274 -17 - 4 53 33 - 4 23 13 - 5 24 28 - 3 52 17 106 0 0 - 4 49 1 12 5 16 75 274 -18 - 5 4 10 - 4 33 52 - 5 35 5 - 4 2 56 107 0 0 - 4 59 31 12 5 23 74 275 -19 - 5 14 40 - 4 44 22 - 5 45 34 - 4 13 27 108 0 0 - 5 9 53 12 5 31 73 275 -20 - 5 25 2 - 4 54 45 - 5 55 55 - 4 23 50 109 0 0 - 5 20 7 12 5 38 72 275 -21 - 5 35 15 - 5 4 59 - 6 6 8 - 4 34 5 110 0 0 - 5 30 13 12 5 46 71 275 -22 - 5 45 21 - 5 15 5 - 6 16 12 - 4 44 12 111 0 0 - 5 40 10 12 5 53 70 275 -23 - 5 55 17 - 5 25 2 - 6 26 8 - 4 54 10 112 0 0 - 5 49 58 12 6 1 69 275 -24 - 6 5 5 - 5 34 51 - 6 35 56 - 5 4 0 113 0 0 - 5 59 38 12 6 8 68 275 -25 - 6 14 44 - 5 44 31 - 6 45 34 - 5 13 40 114 0 0 - 6 9 8 12 6 15 67 275 -26 - 6 24 14 - 5 54 1 - 6 55 3 - 5 23 12 115 0 0 - 6 18 29 12 6 22 66 275 -27 - 6 33 35 - 6 3 23 - 7 4 23 - 5 32 34 116 0 0 - 6 27 41 12 6 29 65 275 -28 - 6 42 46 - 6 12 35 - 7 13 34 - 5 41 46 117 0 0 - 6 36 43 12 6 36 64 275 -29 - 6 51 48 - 6 21 37 - 7 22 35 - 5 50 49 118 0 0 - 6 45 35 12 6 43 63 275 -30 - 7 0 40 - 6 30 30 - 7 31 26 - 5 59 43 119 0 0 - 6 54 17 12 6 50 62 275 -31 - 7 9 22 - 6 39 12 - 7 40 7 - 6 8 26 120 0 0 - 7 2 49 12 6 57 61 275 -32 - 7 17 54 - 6 47 45 - 7 48 38 - 6 16 59 121 0 0 - 7 11 11 12 7 4 59 275 -33 - 7 26 15 - 6 56 7 - 7 56 59 - 6 25 23 122 0 0 - 7 19 23 12 7 10 58 275 -34 - 7 34 27 - 7 4 19 - 8 5 10 - 6 33 35 123 0 0 - 7 27 24 12 7 17 57 275 -35 - 7 42 27 - 7 12 21 - 8 13 10 - 6 41 37 124 0 0 - 7 35 15 12 7 23 56 275 -36 - 7 50 18 - 7 20 12 - 8 20 59 - 6 49 29 125 0 0 - 7 42 54 12 7 30 55 275 -37 - 7 57 57 - 7 27 52 - 8 28 38 - 6 57 10 126 0 0 - 7 50 23 12 7 36 54 275 -38 - 8 5 25 - 7 35 21 - 8 36 6 - 7 4 40 127 0 0 - 7 57 41 12 7 42 53 275 -39 - 8 12 43 - 7 42 39 - 8 43 23 - 7 11 59 128 0 0 - 8 4 48 12 7 49 52 275 -40 - 8 19 49 - 7 49 46 - 8 50 28 - 7 19 6 129 0 0 - 8 11 43 12 7 55 51 275 -41 - 8 26 44 - 7 56 42 - 8 57 23 - 7 26 3 130 0 0 - 8 18 27 12 8 1 50 274 -42 - 8 33 28 - 8 3 26 - 9 4 6 - 7 32 48 131 0 0 - 8 25 0 12 8 7 49 274 -43 - 8 40 1 - 8 9 59 - 9 10 38 - 7 39 21 132 0 0 - 8 31 21 12 8 12 48 274 -44 - 8 46 22 - 8 16 21 - 9 16 58 - 7 45 44 133 0 0 - 8 37 31 12 8 18 47 274 -45 - 8 52 31 - 8 22 31 - 9 23 6 - 7 51 54 134 0 0 - 8 43 29 12 8 24 46 274 -46 - 8 58 28 - 8 28 29 - 9 29 3 - 7 57 53 135 0 0 - 8 49 15 12 8 29 45 274 -47 - 9 4 14 - 8 34 15 - 9 34 48 - 8 3 40 136 0 0 - 8 54 49 12 8 34 44 274 -48 - 9 9 48 - 8 39 49 - 9 40 22 - 8 9 15 137 0 0 - 9 0 11 12 8 40 43 274 -49 - 9 15 10 - 8 45 12 - 9 45 43 - 8 14 38 138 0 0 - 9 5 21 12 8 45 42 273 -50 - 9 20 20 - 8 50 22 - 9 50 52 - 8 19 48 139 0 0 - 9 10 19 12 8 50 41 273 -51 - 9 25 17 - 8 55 21 - 9 55 50 - 8 24 47 140 0 0 - 9 15 5 12 8 55 40 273 -52 - 9 30 3 - 9 0 7 -10 0 35 - 8 29 34 141 0 0 - 9 19 38 12 9 0 39 273 -53 - 9 34 36 - 9 4 40 -10 5 8 - 8 34 8 142 0 0 - 9 24 0 12 9 5 38 273 -54 - 9 38 57 - 9 9 2 -10 9 28 - 8 38 30 143 0 0 - 9 28 9 12 9 9 37 273 -54 - 9 43 6 - 9 13 11 -10 13 37 - 8 42 40 144 0 0 - 9 32 5 12 9 14 36 273 -55 - 9 47 3 - 9 17 8 -10 17 33 - 8 46 37 145 0 0 - 9 35 50 12 9 18 35 272 -56 - 9 50 47 - 9 20 52 -10 21 16 - 8 50 22 146 0 0 - 9 39 21 12 9 23 34 272 -57 - 9 54 18 - 9 24 24 -10 24 47 - 8 53 54 147 0 0 - 9 42 41 12 9 27 33 272 -58 - 9 57 37 - 9 27 44 -10 28 6 - 8 57 14 148 0 0 - 9 45 47 12 9 31 32 272 -59 -10 0 44 - 9 30 51 -10 31 12 - 9 0 21 149 0 0 - 9 48 41 12 9 35 31 272 -60 -10 3 38 - 9 33 45 -10 34 6 - 9 3 16 150 0 0 - 9 51 23 12 9 39 30 272 -61 -10 6 19 - 9 36 27 -10 36 47 - 9 5 58 151 0 0 - 9 53 52 12 9 42 29 271 -62 -10 8 48 - 9 38 56 -10 39 15 - 9 8 27 152 0 0 - 9 56 8 12 9 46 28 271 -63 -10 11 4 - 9 41 12 -10 41 31 - 9 10 44 153 0 0 - 9 58 12 12 9 49 27 271 -64 -10 13 7 - 9 43 16 -10 43 34 - 9 12 48 154 0 0 -10 0 3 12 9 53 26 271 -64 -10 14 58 - 9 45 7 -10 45 25 - 9 14 39 155 0 0 -10 1 41 12 9 56 25 271 -65 -10 16 36 - 9 46 45 -10 47 3 - 9 16 17 156 0 0 -10 3 6 12 9 59 24 271 -66 -10 18 2 - 9 48 11 -10 48 28 - 9 17 43 157 0 0 -10 4 19 12 10 2 23 270 -67 -10 19 15 - 9 49 24 -10 49 41 - 9 18 56 158 0 0 -10 5 19 12 10 5 22 270 -68 -10 20 15 - 9 50 24 -10 50 41 - 9 19 57 159 0 0 -10 6 7 12 10 8 21 270 -68 -10 21 2 - 9 51 12 -10 51 29 - 9 20 44 160 0 0 -10 6 42 12 10 11 20 270 -69 -10 21 37 - 9 51 47 -10 52 3 - 9 21 19 161 0 0 -10 7 4 12 10 13 19 270 -70 -10 21 59 - 9 52 9 -10 52 26 - 9 21 42 162 0 0 -10 7 14 12 10 15 18 270 -71 -10 22 9 - 9 52 18 -10 52 35 - 9 21 51 163 0 0 -10 7 11 12 10 18 17 269 -71 -10 22 6 - 9 52 15 -10 52 32 - 9 21 48 164 0 0 -10 6 55 12 10 20 16 269 -72 -10 21 50 - 9 52 0 -10 52 16 - 9 21 33 165 0 0 -10 6 27 12 10 22 15 269 -73 -10 21 22 - 9 51 31 -10 51 48 - 9 21 4 166 0 0 -10 5 46 12 10 24 14 269 -73 -10 20 41 - 9 50 51 -10 51 8 - 9 20 23 167 0 0 -10 4 53 12 10 25 13 269 -74 -10 19 48 - 9 49 57 -10 50 14 - 9 19 30 168 0 0 -10 3 47 12 10 27 12 269 -75 -10 18 42 - 9 48 51 -10 49 9 - 9 18 24 169 0 0 -10 2 29 12 10 29 11 268 -75 -10 17 24 - 9 47 33 -10 47 51 - 9 17 6 170 0 0 -10 0 58 12 10 30 10 268 -76 -10 15 54 - 9 46 2 -10 46 20 - 9 15 35 171 0 0 - 9 59 15 12 10 31 9 268 -76 -10 14 11 - 9 44 19 -10 44 37 - 9 13 51 172 0 0 - 9 57 19 12 10 32 8 268 -76 -10 12 15 - 9 42 24 -10 42 42 - 9 11 56 173 0 0 - 9 55 12 12 10 33 7 268 -77 -10 10 8 - 9 40 16 -10 40 35 - 9 9 48 174 0 0 - 9 52 52 12 10 34 6 268 -77 -10 7 48 - 9 37 56 -10 38 15 - 9 7 27 175 0 0 - 9 50 20 12 10 35 5 267 -77 -10 5 16 - 9 35 24 -10 35 44 - 9 4 55 176 0 0 - 9 47 36 12 10 36 4 267 -77 -10 2 32 - 9 32 39 -10 33 0 - 9 2 10 177 0 0 - 9 44 39 12 10 36 3 267 -77 - 9 59 36 - 9 29 43 -10 30 4 - 8 59 13 178 0 0 - 9 41 31 12 10 36 2 267 -77 - 9 56 28 - 9 26 34 -10 26 56 - 8 56 5 179 0 0 - 9 38 11 12 10 37 1 267 -77 - 9 53 8 - 9 23 14 -10 23 37 - 8 52 44 180 0 0 - 9 34 39 12 10 37 0 267 -76 - 9 49 36 - 9 19 42 -10 20 5 - 8 49 11 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 4924-01120-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 08 57.0661 DE: -03 26 12.850 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .030 ) * V mag [mag]: 12.1 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (371) Bohemia approx. diameter [km]: 55 approx. diameter ["]: .032 distance from Earth [AU]: 2.40300 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 787 number of rejected observations: 95 time covered by the observations: 1903 Oct 23 - 2008 Feb 07 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.012, 116° remarks: * orbital elements for (371) Bohemia : Mean anomaly = 293.50040711 deg Arg. of pericenter = 341.48697715 deg Long. of node = 283.71129157 deg Inclination = 7.38364168 deg Eccentricity = 0.06089574 Semimajor axis = 2.72697126 AU Perihelion dist = 2.56091032 AU Mag: H = 8.56, G = 0.15 Epoch of elements : MJD 54988.50200000 TDT (2009 Jun 06.502) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 6 371 Bohemia 12h 3.4m UT 12.1 11 8 57.066- 3 26 12.85TYC 4924-01120-1 12.4 13.8 55 3.7 2.403 1.997 -5.78 91.3510 -3.435 -1.17 22.70 12.0567 0.00431 0.02429 8.16878 -1.57745 0.00507 -0.00210 2000 291.6395872009 529.00000341.486977283.711292 7.3836420.06089574 2.7269713 2.5609103 8.7 5.00.15 RATE 2.1886850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.033 99 2.02 0.032 0 54545.5020090606_1120-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org