IOTA/IOTA-ES occultation update for (4369) Seifert / TYC 2370-02724-1 event on 2012 Sep 05, 09:49 UT Visible from W Canada, W USA Summary ------- On 2012 Sep 05 UT, the 18 km diameter asteroid (4369) Seifert will occult a 9.5 mag star in the constellation Perseus for observers along a path across W Canada, W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.1 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: 16 * date and approx. time of event: 2012 Sep 05, 09:43 - 2012 Sep 05, 09:50 UT * geocentric midpoint of event [JD]: 2456175.90943333 * magnitude of target star: 9.5 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 1.1 * Moon: 78 % sunlit, 30° distance * Sun: 97° distance * rough path description: W Canada, W USA The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 4.14 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .100 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .100", .059", 91° ) * approx speed of asteroid's shadow [km/s]: 15.8584 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2370-02724-1 by 4369 Seifert on 2012 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 -161 0 0 2 30 22 9 43 43 0 54 -73 2 23 27 2 37 18 .. .. .. 3 35 3 -160 0 0 3 14 48 9 43 43 2 54 -73 3 7 49 3 21 47 .. .. .. 4 20 2 -159 0 0 4 0 14 9 43 43 3 54 -73 3 53 12 4 7 17 .. .. .. 5 6 2 -158 0 0 4 46 41 9 43 44 4 54 -74 4 39 35 4 53 48 .. .. .. 5 53 4 -157 0 0 5 34 9 9 43 45 5 54 -74 5 27 0 5 41 19 .. .. .. 6 41 8 -156 0 0 6 22 37 9 43 46 7 55 -74 6 15 24 6 29 52 5 16 0 7 30 12 -155 0 0 7 12 5 9 43 47 8 55 -74 7 4 48 7 19 23 6 4 52 8 20 17 -154 0 0 8 2 32 9 43 49 9 55 -74 7 55 11 8 9 54 6 54 44 9 11 21 -153 0 0 8 53 57 9 43 50 10 55 -73 8 46 32 9 1 23 7 45 33 10 3 23 -152 0 0 9 46 19 9 43 52 12 55 -73 9 38 50 9 53 49 8 37 18 10 56 24 -151 0 0 10 39 38 9 43 55 13 55 -72 10 32 4 10 47 12 9 29 59 11 50 20 -150 0 0 11 33 50 9 43 57 14 56 -72 11 26 13 11 41 29 10 23 35 12 45 12 -149 0 0 12 28 57 9 44 0 16 56 -71 12 21 15 12 36 39 11 18 4 13 40 57 -148 0 0 13 24 54 9 44 3 17 56 -70 13 17 9 13 32 41 12 13 24 14 37 34 -147 0 0 14 21 42 9 44 6 18 56 -69 14 13 52 14 29 32 13 9 34 15 35 1 -146 0 0 15 19 17 9 44 10 20 57 -68 15 11 23 15 27 12 14 6 32 16 33 16 -145 0 0 16 17 38 9 44 14 21 57 -67 16 9 40 16 25 37 15 4 15 17 32 16 -144 0 0 17 16 42 9 44 18 22 58 -66 17 8 39 17 24 44 16 2 41 18 31 59 -143 0 0 18 16 26 9 44 22 24 58 -65 18 8 20 18 24 33 17 1 49 19 32 22 -142 0 0 19 16 47 9 44 27 25 59 -64 19 8 37 19 24 59 18 1 34 20 33 22 -141 0 0 20 17 44 9 44 32 27 59 -63 20 9 30 20 25 59 19 1 54 21 34 56 -140 0 0 21 19 11 9 44 37 28 60 -61 21 10 53 21 27 30 20 2 46 22 37 1 -139 0 0 22 21 7 9 44 42 29 60 -60 22 12 45 22 29 29 21 4 7 23 39 32 -138 0 0 23 23 26 9 44 48 31 61 -59 23 15 1 23 31 53 22 5 53 24 42 27 -137 0 0 24 26 6 9 44 54 32 62 -58 24 17 37 24 34 36 23 8 0 25 45 41 -136 0 0 25 29 2 9 45 0 33 62 -56 25 20 30 25 37 36 24 10 25 26 49 11 -135 0 0 26 32 11 9 45 6 34 63 -55 26 23 35 26 40 48 25 13 4 27 52 51 -134 0 0 27 35 27 9 45 12 36 64 -54 27 26 48 27 44 7 26 15 52 28 56 37 -133 0 0 28 38 47 9 45 19 37 65 -52 28 30 5 28 47 30 27 18 45 30 0 26 -132 0 0 29 42 7 9 45 26 38 66 -51 29 33 22 29 50 52 28 21 39 31 4 11 -131 0 0 30 45 20 9 45 33 39 67 -50 30 36 33 30 54 9 29 24 29 32 7 50 -130 0 0 31 48 24 9 45 40 41 68 -48 31 39 35 31 57 15 30 27 12 33 11 16 -129 0 0 32 51 14 9 45 47 42 69 -47 32 42 22 33 0 7 31 29 42 34 14 25 -128 0 0 33 53 44 9 45 54 43 70 -46 33 44 50 34 2 39 32 31 56 35 17 13 -127 0 0 34 55 51 9 46 1 44 71 -45 34 46 55 35 4 47 33 33 48 36 19 35 -126 0 0 35 57 29 9 46 9 45 73 -43 35 48 33 36 6 27 34 35 14 37 21 27 -125 0 0 36 58 36 9 46 17 46 74 -42 36 49 38 37 7 34 35 36 11 38 22 43 -124 0 0 37 59 5 9 46 24 47 76 -41 37 50 7 38 8 5 36 36 34 39 23 20 -123 0 0 38 58 55 9 46 32 48 77 -39 38 49 56 39 7 55 37 36 18 40 23 14 -122 0 0 39 58 0 9 46 39 49 79 -38 39 49 1 40 7 0 38 35 22 41 22 21 -121 0 0 40 56 17 9 46 47 50 80 -37 40 47 18 41 5 17 39 33 39 42 20 37 -120 0 0 41 53 43 9 46 55 51 82 -36 41 44 44 42 2 42 40 31 8 43 17 59 -119 0 0 42 50 14 9 47 2 52 84 -34 42 41 16 42 59 13 41 27 46 44 14 24 -118 0 0 43 45 48 9 47 10 53 85 -33 43 36 51 43 54 46 42 23 28 45 9 49 -117 0 0 44 40 22 9 47 17 54 87 -32 44 31 26 44 49 19 43 18 13 46 4 12 -116 0 0 45 33 54 9 47 25 55 89 -31 45 25 0 45 42 50 44 11 59 46 57 29 -115 0 0 46 26 22 9 47 32 55 91 -30 46 17 30 46 35 16 45 4 42 47 49 40 -114 0 0 47 17 44 9 47 40 56 93 -29 47 8 53 47 26 36 45 56 22 48 40 43 -113 0 0 48 7 58 9 47 47 57 95 -28 47 59 10 48 16 48 46 46 57 49 30 36 -112 0 0 48 57 4 9 47 54 57 98 -27 48 48 18 49 5 51 47 36 25 50 19 19 -111 0 0 49 45 1 9 48 1 58 100 -26 49 36 17 49 53 45 48 24 45 51 6 50 -110 0 0 50 31 47 9 48 8 58 102 -24 50 23 7 50 40 28 49 11 57 51 53 8 -109 0 0 51 17 23 9 48 15 59 104 -23 51 8 45 51 26 1 49 58 0 52 38 15 -108 0 0 52 1 47 9 48 21 59 106 -23 51 53 13 52 10 23 50 42 54 53 22 9 -107 0 0 52 45 2 9 48 28 59 109 -22 52 36 31 52 53 33 51 26 38 54 4 51 -106 0 0 53 27 5 9 48 34 60 111 -21 53 18 38 53 35 33 52 9 14 54 46 21 -105 0 0 54 7 59 9 48 41 60 113 -20 53 59 35 54 16 23 52 50 40 55 26 40 -104 0 0 54 47 42 9 48 47 60 116 -19 54 39 22 54 56 3 53 30 57 56 5 48 -103 0 0 55 26 18 9 48 53 60 118 -18 55 18 1 55 34 35 54 10 7 56 43 47 -102 0 0 56 3 45 9 48 59 61 120 -17 55 55 32 56 11 58 54 48 10 57 20 37 -101 0 0 56 40 5 9 49 5 61 123 -16 56 31 57 56 48 14 55 25 6 57 56 19 -100 0 0 57 15 19 9 49 10 61 125 -15 57 7 15 57 23 24 56 0 57 58 30 55 - 99 0 0 57 49 29 9 49 16 61 127 -15 57 41 28 57 57 30 56 35 43 59 4 26 - 98 0 0 58 22 35 9 49 21 61 130 -14 58 14 39 58 30 32 57 9 26 59 36 53 - 97 0 0 58 54 39 9 49 27 61 132 -13 58 46 46 59 2 31 57 42 7 60 8 18 - 96 0 0 59 25 42 9 49 32 61 134 -12 59 17 54 59 33 30 58 13 48 60 38 42 - 95 0 0 59 55 45 9 49 37 61 136 -12 59 48 1 60 3 30 58 44 29 61 8 6 - 94 0 0 60 24 50 9 49 42 61 138 -11 60 17 11 60 32 31 59 14 12 61 36 32 - 93 0 0 60 52 59 9 49 47 61 141 -10 60 45 24 61 0 36 59 42 58 62 4 2 - 92 0 0 61 20 13 9 49 51 61 143 -10 61 12 41 61 27 45 60 10 48 62 30 37 - 91 0 0 61 46 33 9 49 56 61 145 -9 61 39 5 61 54 1 60 37 45 62 56 19 - 90 0 0 62 12 0 9 50 0 61 147 -8 62 4 37 62 19 25 61 3 49 63 21 9 - 89 0 0 62 36 37 9 50 5 61 149 -8 62 29 18 62 43 57 61 29 2 63 45 8 - 88 0 0 63 0 24 9 50 9 61 151 -7 62 53 9 63 7 41 61 53 25 64 8 18 - 87 0 0 63 23 24 9 50 13 61 153 -7 63 16 12 63 30 36 62 16 59 64 30 41 - 86 0 0 63 45 36 9 50 17 61 155 -6 63 38 28 63 52 45 62 39 47 64 52 17 - 85 0 0 64 7 4 9 50 21 60 157 -5 63 59 59 64 14 8 63 1 48 65 13 9 - 84 0 0 64 27 47 9 50 25 60 159 -5 64 20 46 64 34 48 63 23 5 65 33 18 - 83 0 0 64 47 47 9 50 29 60 160 -4 64 40 51 64 54 45 63 43 39 65 52 44 - 82 0 0 65 7 7 9 50 33 60 162 -4 65 0 13 65 14 1 64 3 30 66 11 30 - 81 0 0 65 25 46 9 50 36 60 164 -3 65 18 56 65 32 36 64 22 41 66 29 36 - 80 0 0 65 43 45 9 50 40 60 166 -3 65 36 59 65 50 33 64 41 12 66 47 3 - 79 0 0 66 1 7 9 50 44 59 168 -2 65 54 24 66 7 51 64 59 4 67 3 54 - 78 0 0 66 17 53 9 50 47 59 169 -2 66 11 13 66 24 33 65 16 19 67 20 9 - 77 0 0 66 34 2 9 50 50 59 171 -1 66 27 26 66 40 40 65 32 58 67 35 48 - 76 0 0 66 49 37 9 50 54 59 173 -1 66 43 4 66 56 12 65 49 1 67 50 54 - 75 0 0 67 4 39 9 50 57 59 174 0 66 58 8 67 11 10 66 4 30 68 5 27 Uncertainty in time = +/- 7 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 2370-02724-1 * constellation : Perseus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 04 16.2826 DE: +35 49 03.009 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 9.5 * B mag [mag]: 10.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4369) Seifert approx. diameter [km]: 18 approx. diameter ["]: .016 distance from Earth [AU]: 1.57700 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 626 number of rejected observations: 22 time covered by the observations: 1940 Sep 06 - 2011 Aug 28 1 sigma uncertainty ellipse (major, minor, PA): 0.099, 0.056, 91° remarks: * orbital elements for (4369) Seifert : Mean anomaly = 10.48119757 deg Arg. of pericenter = 77.20568526 deg Long. of node = 299.41977243 deg Inclination = 11.81585202 deg Eccentricity = 0.25309818 Semimajor axis = 2.60954568 AU Perihelion dist = 1.94907441 AU Mag: H = 11.85, G = 0.15 Epoch of elements : MJD 56175.40900000 TDT (2012 Sep 05.409) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 5 4369 Seifert 9h 49.6m UT 9.5 4 4 16.283 35 49 3.01TYC 2370-02724-1 10.7 15.7 18 1.1 1.577 3.703 21.52 -71.2357 35.812 32.25 6.59 9.8264 -0.20824 0.42770 8.07636 3.85890 -0.00495 -0.00116 2000 9.2165382012 831.00000 77.205685299.419772 11.8158520.25309818 2.6095457 1.949074411.9 5.00.15 RATE 2.3380660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.100 0.059 91 5.14 0.065 0 0-4-1 056129.0020120905_2724-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org