IOTA/IOTA-ES occultation update for (163) Erigone / TYC 1265-00021-1 event on 2009 Sep 05, 20:14 UT Visible from Summary ------- On 2009 Sep 05 UT, the 73 km diameter asteroid (163) Erigone will occult a 10.4 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 13.9 mag (the magnitude of the asteroid) for at most 4.2 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: 96 * date and approx. time of event: 2009 Sep 05, 20:08 - 2009 Sep 05, 20:14 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 4.2 * Moon: 99 % sunlit, 72° distance * Sun: 95° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .024", 86° ) * approx speed of asteroid's shadow [km/s]: 17.4893 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1265-00021-1 by 163 Erigone on 2009 Sep 5 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 49 0 0 4 3 47 20 8 13 0 73 -76 3 43 1 4 24 34 3 26 0 4 41 36 50 0 0 4 21 59 20 8 13 1 73 -77 4 1 13 4 42 46 3 44 12 4 59 48 51 0 0 4 40 11 20 8 13 2 73 -77 4 19 25 5 0 58 4 2 24 5 18 1 52 0 0 4 58 24 20 8 13 3 73 -77 4 37 38 5 19 11 4 20 36 5 36 14 53 0 0 5 16 37 20 8 14 4 74 -77 4 55 50 5 37 23 4 38 49 5 54 26 54 0 0 5 34 49 20 8 14 5 74 -77 5 14 3 5 55 35 4 57 1 6 12 38 55 0 0 5 53 0 20 8 15 7 74 -77 5 32 14 6 13 47 5 15 13 6 30 50 56 0 0 6 11 10 20 8 16 8 74 -77 5 50 24 6 31 57 5 33 23 6 48 59 57 0 0 6 29 18 20 8 17 9 74 -77 6 8 32 6 50 5 5 51 31 7 7 8 58 0 0 6 47 25 20 8 18 10 74 -77 6 26 39 7 8 11 6 9 38 7 25 14 59 0 0 7 5 28 20 8 19 11 74 -76 6 44 43 7 26 15 6 27 42 7 43 17 60 0 0 7 23 29 20 8 20 12 74 -76 7 2 44 7 44 15 6 45 44 8 1 18 61 0 0 7 41 27 20 8 22 13 74 -75 7 20 42 8 2 13 7 3 42 8 19 15 62 0 0 7 59 21 20 8 23 14 75 -75 7 38 37 8 20 7 7 21 37 8 37 8 63 0 0 8 17 11 20 8 25 15 75 -74 7 56 27 8 37 56 7 39 27 8 54 58 64 0 0 8 34 57 20 8 27 16 75 -74 8 14 13 8 55 42 7 57 14 9 12 43 65 0 0 8 52 38 20 8 28 17 75 -73 8 31 54 9 13 22 8 14 55 9 30 23 66 0 0 9 10 14 20 8 30 18 75 -72 8 49 31 9 30 57 8 32 32 9 47 58 67 0 0 9 27 44 20 8 33 19 75 -71 9 7 1 9 48 27 8 50 3 10 5 27 68 0 0 9 45 8 20 8 35 20 76 -71 9 24 26 10 5 51 9 7 28 10 22 50 69 0 0 10 2 26 20 8 37 21 76 -70 9 41 45 10 23 8 9 24 47 10 40 7 70 0 0 10 19 37 20 8 40 22 76 -69 9 58 56 10 40 19 9 41 59 10 57 18 71 0 0 10 36 42 20 8 42 23 76 -68 10 16 1 10 57 23 9 59 5 11 14 21 72 0 0 10 53 39 20 8 45 24 76 -67 10 32 59 11 14 19 10 16 3 11 31 17 73 0 0 11 10 28 20 8 47 25 77 -67 10 49 49 11 31 8 10 32 53 11 48 5 74 0 0 11 27 9 20 8 50 26 77 -66 11 6 31 11 47 48 10 49 36 12 4 44 75 0 0 11 43 42 20 8 53 27 77 -65 11 23 4 12 4 20 11 6 10 12 21 16 76 0 0 12 0 6 20 8 56 28 77 -64 11 39 29 12 20 43 11 22 35 12 37 38 77 0 0 12 16 21 20 8 59 29 77 -63 11 55 44 12 36 57 11 38 51 12 53 52 78 0 0 12 32 26 20 9 3 30 78 -62 12 11 51 12 53 2 11 54 58 13 9 56 79 0 0 12 48 22 20 9 6 31 78 -61 12 27 47 13 8 57 12 10 55 13 25 50 80 0 0 13 4 8 20 9 10 32 78 -60 12 43 34 13 24 42 12 26 43 13 41 34 81 0 0 13 19 43 20 9 13 33 78 -59 12 59 10 13 40 16 12 42 20 13 57 8 82 0 0 13 35 8 20 9 17 34 79 -58 13 14 36 13 55 40 12 57 46 14 12 32 83 0 0 13 50 22 20 9 20 35 79 -57 13 29 50 14 10 53 13 13 1 14 27 44 84 0 0 14 5 24 20 9 24 36 79 -56 13 44 54 14 25 55 13 28 6 14 42 45 85 0 0 14 20 15 20 9 28 37 80 -56 13 59 46 14 40 45 13 42 59 14 57 34 86 0 0 14 34 55 20 9 32 38 80 -55 14 14 26 14 55 24 13 57 40 15 12 12 87 0 0 14 49 22 20 9 36 39 80 -54 14 28 55 15 9 50 14 12 9 15 26 37 88 0 0 15 3 37 20 9 40 40 81 -53 14 43 11 15 24 4 14 26 26 15 40 51 89 0 0 15 17 40 20 9 45 41 81 -52 14 57 14 15 38 6 14 40 30 15 54 51 90 0 0 15 31 29 20 9 49 42 81 -51 15 11 5 15 51 54 14 54 21 16 8 39 91 0 0 15 45 6 20 9 53 43 82 -50 15 24 43 16 5 30 15 8 0 16 22 14 92 0 0 15 58 29 20 9 58 44 82 -49 15 38 7 16 18 53 15 21 25 16 35 36 93 0 0 16 11 39 20 10 2 45 82 -48 15 51 18 16 32 2 15 34 37 16 48 44 94 0 0 16 24 36 20 10 7 46 83 -47 16 4 15 16 44 57 15 47 35 17 1 38 95 0 0 16 37 18 20 10 12 47 83 -46 16 16 59 16 57 38 16 0 19 17 14 19 96 0 0 16 49 46 20 10 16 48 83 -45 16 29 28 17 10 5 16 12 49 17 26 45 97 0 0 17 2 0 20 10 21 49 84 -44 16 41 43 17 22 18 16 25 5 17 38 58 98 0 0 17 14 0 20 10 26 50 84 -43 16 53 43 17 34 17 16 37 6 17 50 55 99 0 0 17 25 44 20 10 31 51 85 -42 17 5 29 17 46 0 16 48 53 18 2 38 100 0 0 17 37 14 20 10 36 52 85 -41 17 17 0 17 57 29 17 0 24 18 14 6 101 0 0 17 48 29 20 10 41 53 86 -40 17 28 16 18 8 43 17 11 41 18 25 19 102 0 0 17 59 29 20 10 46 54 86 -39 17 39 16 18 19 42 17 22 43 18 36 17 103 0 0 18 10 13 20 10 51 55 86 -38 17 50 2 18 30 25 17 33 29 18 47 0 104 0 0 18 20 42 20 10 56 56 87 -37 18 0 31 18 40 53 17 43 59 18 57 27 105 0 0 18 30 55 20 11 2 57 87 -36 18 10 46 18 51 5 17 54 14 19 7 38 106 0 0 18 40 52 20 11 7 58 88 -35 18 20 44 19 1 2 18 4 13 19 17 34 107 0 0 18 50 34 20 11 12 59 89 -34 18 30 26 19 10 42 18 13 56 19 27 13 108 0 0 18 59 59 20 11 18 60 89 -34 18 39 52 19 20 7 18 23 23 19 36 37 109 0 0 19 9 8 20 11 23 61 90 -33 18 49 2 19 29 15 18 32 34 19 45 45 110 0 0 19 18 1 20 11 29 62 90 -32 18 57 56 19 38 7 18 41 28 19 54 36 111 0 0 19 26 38 20 11 34 63 91 -31 19 6 33 19 46 42 18 50 6 20 3 11 112 0 0 19 34 58 20 11 40 64 92 -30 19 14 54 19 55 1 18 58 28 20 11 29 113 0 0 19 43 1 20 11 45 65 92 -29 19 22 58 20 3 4 19 6 33 20 19 31 114 0 0 19 50 47 20 11 51 66 93 -28 19 30 46 20 10 50 19 14 21 20 27 16 115 0 0 19 58 17 20 11 57 67 94 -27 19 38 16 20 18 19 19 21 52 20 34 44 116 0 0 20 5 30 20 12 3 68 95 -26 19 45 30 20 25 31 19 29 6 20 41 56 117 0 0 20 12 26 20 12 8 69 95 -25 19 52 26 20 32 26 19 36 3 20 48 50 118 0 0 20 19 5 20 12 14 70 96 -24 19 59 6 20 39 4 19 42 43 20 55 28 119 0 0 20 25 26 20 12 20 71 97 -23 20 5 28 20 45 25 19 49 6 21 1 48 120 0 0 20 31 31 20 12 26 72 98 -22 20 11 33 20 51 28 19 55 12 21 7 51 121 0 0 20 37 18 20 12 32 73 99 -21 20 17 21 20 57 15 20 1 0 21 13 37 122 0 0 20 42 48 20 12 37 74 101 -20 20 22 51 21 2 44 20 6 31 21 19 6 123 0 0 20 48 0 20 12 43 74 102 -19 20 28 4 21 7 56 20 11 44 21 24 17 124 0 0 20 52 55 20 12 49 75 103 -18 20 33 0 21 12 50 20 16 40 21 29 11 125 0 0 20 57 32 20 12 55 76 105 -17 20 37 38 21 17 27 20 21 19 21 33 48 126 0 0 21 1 52 20 13 1 77 107 -16 20 41 58 21 21 47 20 25 39 21 38 7 127 0 0 21 5 54 20 13 7 78 109 -15 20 46 1 21 25 49 20 29 43 21 42 8 128 0 0 21 9 39 20 13 13 79 111 -15 20 49 46 21 29 33 20 33 28 21 45 52 129 0 0 21 13 6 20 13 19 80 114 -14 20 53 13 21 32 59 20 36 56 21 49 18 130 0 0 21 16 15 20 13 25 81 117 -13 20 56 23 21 36 8 20 40 6 21 52 27 131 0 0 21 19 7 20 13 31 81 120 -12 20 59 15 21 38 59 20 42 58 21 55 18 132 0 0 21 21 41 20 13 37 82 125 -11 21 1 49 21 41 33 20 45 32 21 57 51 133 0 0 21 23 56 20 13 43 83 130 -10 21 4 5 21 43 49 20 47 48 22 0 6 134 0 0 21 25 55 20 13 49 84 136 -9 21 6 3 21 45 46 20 49 47 22 2 4 135 0 0 21 27 35 20 13 55 84 143 -8 21 7 44 21 47 27 20 51 28 22 3 44 136 0 0 21 28 57 20 14 2 85 152 -7 21 9 6 21 48 49 20 52 50 22 5 6 137 0 0 21 30 2 20 14 8 85 163 -6 21 10 11 21 49 53 20 53 55 22 6 11 138 0 0 21 30 49 20 14 14 85 175 -5 21 10 58 21 50 40 20 54 42 22 6 57 139 0 0 21 31 18 20 14 20 85 187 -4 21 11 27 21 51 9 20 55 11 22 7 26 140 0 0 21 31 28 20 14 26 85 198 -3 21 11 38 21 51 20 20 55 22 22 7 37 141 0 0 21 31 22 20 14 32 84 209 -2 21 11 31 21 51 13 20 55 15 22 7 30 142 0 0 21 30 57 20 14 38 84 217 -1 21 11 6 21 50 48 20 54 50 22 7 5 143 0 0 21 30 14 20 14 44 83 225 0 21 10 23 21 50 5 20 54 7 22 6 23 Uncertainty in time = +/- 2 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 1265-00021-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 27 41.5276 DE: +16 43 29.354 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .021 ) * V mag [mag]: 10.4 * B mag [mag]: 11.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (163) Erigone approx. diameter [km]: 73 approx. diameter ["]: .058 distance from Earth [AU]: 1.72900 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 903 number of rejected observations: 96 time covered by the observations: 1903 Sep 23 - 2007 Aug 15 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.011, 81° remarks: * orbital elements for (163) Erigone : Mean anomaly = 317.89838908 deg Arg. of pericenter = 298.36307248 deg Long. of node = 160.20957947 deg Inclination = 4.81330277 deg Eccentricity = 0.19019048 Semimajor axis = 2.36710945 AU Perihelion dist = 1.91690777 AU Mag: H = 9.42, G = -0.04 Epoch of elements : MJD 55079.84300000 TDT (2009 Sep 05.843) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 5 163 Erigone 20h 14.3m UT 10.4 4 27 41.528 16 43 29.35TYC 1265-00021-1 11.0 13.9 73 4.2 1.729 3.495 0.43 138.2882 16.725 -123.93 6.53 20.2379 0.00028 0.08083 9.87107 0.08559 -0.00514 -0.00078 2000 315.2345742009 827.00000298.363072160.209579 4.8133030.19019048 2.3671095 1.9169078 9.5 5.0-.04 RATE 2.7063040 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.024 86 1.41 0.024 0 54581.5020090905_0021-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org