IOTA/IOTA-ES occultation update for (1146) Biarmia / UCAC2 27124725 event on 2009 Apr 11, 16:07 UT Visible from Summary ------- On 2009 Apr 11 UT, the 31 km diameter asteroid (1146) Biarmia will occult a 11.8 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.8 mag (the magnitude of the asteroid) for at most 3.3 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: 20 * date and approx. time of event: 2009 Apr 11, 15:58 - 2009 Apr 11, 16:14 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 3.3 * Moon: 95 % sunlit, 33° distance * Sun: 125° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 3.37 * 1 sigma uncertainty interval [seconds]: +/- 10.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .086 +/- .079) * 1 sigma uncertainty ellipse (major, minor, PA): ( .086", .079", 89° ) * approx speed of asteroid's shadow [km/s]: 9.3151 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 27124725 by 1146 Biarmia on 2009 Apr 11 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 120 9 29 67 0 0 16 14 20 1 129 -15 120 54 53 119 23 3 ... .. .. ... .. .. 122 54 2 66 0 0 16 14 20 3 132 -15 123 34 31 122 12 48 ... .. .. 117 11 13 125 13 4 65 0 0 16 14 18 4 134 -16 125 49 52 124 35 43 ... .. .. 120 6 37 127 12 34 64 0 0 16 14 17 5 136 -17 127 46 27 126 38 14 ... .. .. 122 33 29 128 56 31 63 0 0 16 14 14 7 137 -18 129 28 2 128 24 37 132 52 12 124 39 1 130 27 45 62 0 0 16 14 12 8 139 -19 130 57 19 129 57 53 134 9 33 126 27 50 131 48 23 61 0 0 16 14 9 9 140 -20 132 16 17 131 20 14 135 18 17 128 3 8 133 0 2 60 0 0 16 14 6 10 141 -20 133 26 29 132 33 21 136 19 35 129 27 15 134 3 57 59 0 0 16 14 2 11 142 -21 134 29 9 133 38 33 137 14 26 130 41 55 135 1 10 58 0 0 16 13 58 12 142 -22 135 25 16 134 36 54 138 3 36 131 48 32 135 52 30 57 0 0 16 13 54 13 143 -23 136 15 37 135 29 14 138 47 45 132 48 8 136 38 38 56 0 0 16 13 50 14 143 -24 137 0 52 136 16 16 139 27 25 133 41 38 137 20 8 55 0 0 16 13 45 16 144 -24 137 41 34 136 58 34 140 3 5 134 29 44 137 57 28 54 0 0 16 13 40 17 144 -25 138 18 12 137 36 38 140 35 7 135 13 1 138 31 4 53 0 0 16 13 35 18 145 -26 138 51 9 138 10 54 141 3 53 135 52 0 139 1 16 52 0 0 16 13 30 19 145 -27 139 20 45 138 41 42 141 29 39 136 27 6 139 28 23 51 0 0 16 13 24 20 145 -27 139 47 19 139 9 22 141 52 41 136 58 41 139 52 39 50 0 0 16 13 18 20 145 -28 140 11 5 139 34 9 142 13 13 137 27 3 140 14 20 49 0 0 16 13 12 21 145 -29 140 32 18 139 56 17 142 31 25 137 52 30 140 33 36 48 0 0 16 13 6 22 145 -30 140 51 8 140 16 0 142 47 30 138 15 15 140 50 39 47 0 0 16 12 59 23 146 -31 141 7 48 140 33 27 143 1 34 138 35 31 141 5 38 46 0 0 16 12 52 24 145 -31 141 22 24 140 48 48 143 13 47 138 53 28 141 18 41 45 0 0 16 12 45 25 145 -32 141 35 7 141 2 11 143 24 16 139 9 16 141 29 55 44 0 0 16 12 38 26 145 -33 141 46 2 141 13 45 143 33 7 139 23 3 141 39 27 43 0 0 16 12 31 27 145 -34 141 55 16 141 23 35 143 40 26 139 34 58 141 47 24 42 0 0 16 12 23 28 145 -35 142 2 56 141 31 48 143 46 17 139 45 7 141 53 49 41 0 0 16 12 15 29 145 -36 142 9 6 141 38 29 143 50 46 139 53 36 141 58 48 40 0 0 16 12 7 29 144 -36 142 13 51 141 43 42 143 53 57 140 0 30 142 2 25 39 0 0 16 11 59 30 144 -37 142 17 15 141 47 33 143 55 53 140 5 54 142 4 44 38 0 0 16 11 50 31 144 -38 142 19 21 141 50 4 143 56 37 140 9 52 142 5 47 37 0 0 16 11 41 32 143 -39 142 20 13 141 51 19 143 56 13 140 12 28 142 5 39 36 0 0 16 11 32 33 143 -40 142 19 53 141 51 21 143 54 42 140 13 45 142 4 20 35 0 0 16 11 23 33 143 -41 142 18 25 141 50 13 143 52 8 140 13 46 142 1 55 34 0 0 16 11 14 34 142 -42 142 15 50 141 47 57 143 48 32 140 12 35 141 58 25 33 0 0 16 11 4 35 142 -42 142 12 11 141 44 35 143 43 56 140 10 13 141 53 51 32 0 0 16 10 55 36 141 -43 142 7 30 141 40 10 143 38 22 140 6 42 141 48 15 31 0 0 16 10 45 36 140 -44 142 1 47 141 34 41 143 31 50 140 2 4 141 41 39 30 0 0 16 10 35 37 140 -45 141 55 4 141 28 12 143 24 23 139 56 21 141 34 4 29 0 0 16 10 25 38 139 -46 141 47 23 141 20 43 143 16 1 139 49 34 141 25 31 28 0 0 16 10 14 38 138 -47 141 38 43 141 12 15 143 6 45 139 41 45 141 15 59 27 0 0 16 10 4 39 138 -48 141 29 7 141 2 49 142 56 35 139 32 53 141 5 31 26 0 0 16 9 53 39 137 -49 141 18 34 140 52 25 142 45 32 139 22 59 140 54 6 25 0 0 16 9 42 40 136 -50 141 7 5 140 41 4 142 33 37 139 12 5 140 41 45 24 0 0 16 9 31 41 135 -51 140 54 41 140 28 46 142 20 49 139 0 10 140 28 27 23 0 0 16 9 19 41 134 -52 140 41 20 140 15 31 142 7 8 138 47 15 140 14 13 22 0 0 16 9 8 42 134 -53 140 27 4 140 1 20 141 52 35 138 33 19 139 59 2 21 0 0 16 8 56 42 133 -53 140 11 51 139 46 11 141 37 9 138 18 22 139 42 54 20 0 0 16 8 45 43 132 -54 139 55 42 139 30 4 141 20 50 138 2 25 139 25 49 19 0 0 16 8 33 43 131 -55 139 38 36 139 13 0 141 3 37 137 45 25 139 7 45 18 0 0 16 8 21 43 130 -56 139 20 31 138 54 56 140 45 30 137 27 24 138 48 42 17 0 0 16 8 8 44 129 -57 139 1 29 138 35 53 140 26 27 137 8 18 138 28 39 16 0 0 16 7 56 44 127 -58 138 41 26 138 15 49 140 6 28 136 48 8 138 7 34 15 0 0 16 7 44 44 126 -59 138 20 23 137 54 43 139 45 32 136 26 53 137 45 27 14 0 0 16 7 31 45 125 -60 137 58 17 137 32 34 139 23 36 136 4 29 137 22 14 13 0 0 16 7 18 45 124 -61 137 35 6 137 9 19 139 0 41 135 40 56 136 57 55 12 0 0 16 7 5 45 123 -62 137 10 51 136 44 57 138 36 43 135 16 12 136 32 28 11 0 0 16 6 52 45 122 -64 136 45 27 136 19 26 138 11 41 134 50 14 136 5 49 10 0 0 16 6 39 45 121 -65 136 18 52 135 52 43 137 45 33 134 23 0 135 37 57 9 0 0 16 6 25 45 119 -66 135 51 5 135 24 46 137 18 17 133 54 27 135 8 49 8 0 0 16 6 12 45 118 -67 135 22 3 134 55 32 136 49 50 133 24 31 134 38 21 7 0 0 16 5 58 45 117 -68 134 51 41 134 24 57 136 20 8 132 53 8 134 6 29 6 0 0 16 5 45 45 116 -69 134 19 57 133 52 58 135 49 10 132 20 16 133 33 10 5 0 0 16 5 31 45 114 -70 133 46 46 133 19 31 135 16 50 131 45 48 132 58 19 4 0 0 16 5 17 45 113 -71 133 12 4 132 44 31 134 43 6 131 9 40 132 21 52 3 0 0 16 5 3 45 112 -72 132 35 46 132 7 53 134 7 52 130 31 47 131 43 41 2 0 0 16 4 48 44 111 -74 131 57 47 131 29 31 133 31 5 129 52 0 131 3 42 1 0 0 16 4 34 44 110 -75 131 18 1 130 49 18 132 52 37 129 10 14 130 21 46 0 0 0 16 4 19 44 108 -76 130 36 19 130 7 8 132 12 24 128 26 19 129 37 46 - 1 0 0 16 4 5 43 107 -77 129 52 35 129 22 53 131 30 18 127 40 6 Latitude Latitude Latitude Latitude 128 0 0 - 3 3 31 16 3 34 42 105 -80 - 3 22 2 - 2 44 51 - 5 22 56 - 0 34 33 127 0 0 - 4 13 16 16 3 16 41 104 -81 - 4 31 10 - 3 55 14 - 6 28 16 - 1 49 38 126 0 0 - 5 18 52 16 3 0 40 103 -83 - 5 36 13 - 5 1 24 - 7 29 53 - 2 59 59 125 0 0 - 6 20 38 16 2 44 40 102 -84 - 6 37 29 - 6 3 41 - 8 28 3 - 4 6 0 124 0 0 - 7 18 50 16 2 28 39 101 -85 - 7 35 14 - 7 2 20 - 9 22 58 - 5 8 3 123 0 0 - 8 13 43 16 2 14 38 101 -87 - 8 29 41 - 7 57 38 -10 14 52 - 6 6 24 122 0 0 - 9 5 28 16 2 0 37 100 -88 - 9 21 5 - 8 49 47 -11 3 53 - 7 1 19 121 0 0 - 9 54 18 16 1 47 36 99 -88 -10 9 34 - 9 38 58 -11 50 13 - 7 53 1 120 0 0 -10 40 23 16 1 34 35 99 -88 -10 55 20 -10 25 21 -12 33 59 - 8 41 44 119 0 0 -11 23 50 16 1 22 34 98 -87 -11 38 30 -11 9 6 -13 15 19 - 9 27 36 118 0 0 -12 4 49 16 1 11 33 98 -86 -12 19 13 -11 50 22 -13 54 21 -10 10 48 117 0 0 -12 43 27 16 1 0 33 98 -85 -12 57 36 -12 29 14 -14 31 10 -10 51 28 116 0 0 -13 19 50 16 0 49 32 98 -84 -13 33 45 -13 5 51 -15 5 52 -11 29 43 115 0 0 -13 54 4 16 0 39 31 97 -83 -14 7 46 -13 40 17 -15 38 33 -12 5 41 114 0 0 -14 26 14 16 0 29 30 97 -82 -14 39 45 -14 12 40 -16 9 18 -12 39 27 113 0 0 -14 56 26 16 0 20 29 97 -80 -15 9 46 -14 43 3 -16 38 10 -13 11 8 112 0 0 -15 24 44 16 0 11 28 97 -79 -15 37 55 -15 11 31 -17 5 15 -13 40 48 111 0 0 -15 51 13 16 0 3 27 97 -78 -16 4 14 -15 38 8 -17 30 35 -14 8 31 110 0 0 -16 15 55 15 59 55 26 97 -77 -16 28 47 -16 2 59 -17 54 14 -14 34 23 109 0 0 -16 38 54 15 59 47 25 97 -76 -16 51 39 -16 26 6 -18 16 15 -14 58 26 108 0 0 -17 0 14 15 59 40 24 97 -75 -17 12 51 -16 47 33 -18 36 41 -15 20 45 107 0 0 -17 19 57 15 59 33 23 97 -74 -17 32 28 -17 7 23 -18 55 35 -15 41 22 106 0 0 -17 38 6 15 59 26 22 98 -73 -17 50 31 -17 25 38 -19 12 59 -16 0 20 105 0 0 -17 54 43 15 59 20 21 98 -72 -18 7 2 -17 42 21 -19 28 55 -16 17 43 104 0 0 -18 9 50 15 59 14 20 98 -71 -18 22 5 -17 57 33 -19 43 25 -16 33 31 103 0 0 -18 23 30 15 59 8 19 98 -70 -18 35 40 -18 11 18 -19 56 31 -16 47 48 102 0 0 -18 35 44 15 59 2 19 98 -69 -18 47 49 -18 23 36 -20 8 14 -17 0 35 101 0 0 -18 46 33 15 58 57 18 98 -68 -18 58 35 -18 34 29 -20 18 36 -17 11 55 100 0 0 -18 56 0 15 58 53 17 99 -68 -19 7 58 -18 43 59 -20 27 38 -17 21 48 99 0 0 -19 4 4 15 58 48 16 99 -67 -19 16 0 -18 52 6 -20 35 22 -17 30 15 98 0 0 -19 10 49 15 58 44 15 99 -66 -19 22 42 -18 58 53 -20 41 48 -17 37 19 97 0 0 -19 16 13 15 58 40 14 99 -65 -19 28 4 -19 4 19 -20 46 57 -17 43 0 96 0 0 -19 20 18 15 58 36 13 100 -64 -19 32 8 -19 8 26 -20 50 50 -17 47 19 95 0 0 -19 23 5 15 58 32 12 100 -63 -19 34 54 -19 11 14 -20 53 27 -17 50 17 94 0 0 -19 24 35 15 58 29 11 100 -62 -19 36 22 -19 12 45 -20 54 50 -17 51 54 93 0 0 -19 24 47 15 58 26 10 101 -61 -19 36 33 -19 12 57 -20 54 58 -17 52 10 92 0 0 -19 23 41 15 58 24 9 101 -60 -19 35 28 -19 11 52 -20 53 51 -17 51 7 91 0 0 -19 21 19 15 58 21 8 101 -59 -19 33 6 -19 9 30 -20 51 30 -17 48 44 90 0 0 -19 17 40 15 58 19 7 102 -58 -19 29 28 -19 5 50 .. .. .. -17 45 1 89 0 0 -19 12 44 15 58 17 6 102 -58 -19 24 32 -19 0 54 .. .. .. -17 39 58 88 0 0 -19 6 31 15 58 15 5 102 -57 -19 18 20 -18 54 39 .. .. .. -17 33 35 87 0 0 -18 59 0 15 58 14 4 103 -56 -19 10 51 -18 47 7 .. .. .. -17 25 52 86 0 0 -18 50 11 15 58 13 3 103 -55 -19 2 4 -18 38 16 .. .. .. -17 16 47 85 0 0 -18 40 4 15 58 12 3 103 -54 -18 51 59 -18 28 6 .. .. .. -17 6 21 84 0 0 -18 28 37 15 58 11 2 103 -53 -18 40 35 -18 16 37 .. .. .. -16 54 33 83 0 0 -18 15 50 15 58 11 1 104 -52 -18 27 51 -18 3 47 .. .. .. -16 41 22 Uncertainty in time = +/- 11 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 27124725 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 04 52.3300 DE: -13 16 26.726 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .075, .075 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1146) Biarmia approx. diameter [km]: 31 approx. diameter ["]: .025 distance from Earth [AU]: 1.68800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 837 number of rejected observations: 44 time covered by the observations: 1929 May 07 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.025, 84° remarks: * orbital elements for (1146) Biarmia : Mean anomaly = 335.33321856 deg Arg. of pericenter = 64.43295960 deg Long. of node = 213.97709687 deg Inclination = 17.03225502 deg Eccentricity = 0.25075043 Semimajor axis = 3.05093557 AU Perihelion dist = 2.28591216 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 54932.67200000 TDT (2009 Apr 11.672) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 11 1146 Biarmia 16h 6.3m UT 11.8 17 4 52.330-13 16 26.73UCAC2 27124725 0.0 13.8 31 3.3 1.688 0.842 24.48 174.6424 -13.280 -61.33 8.53 16.1047 -0.62873 0.31626 2.36381 4.69635 -0.00455 -0.00009 2000 334.8390322009 4 9.00000 64.432960213.977097 17.0322550.25075043 3.0509356 2.2859122 9.8 5.00.15 RATE 1.8495010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.086 0.079 89 4.37 0.085 0 54545.5020090411_124725 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 07:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org