IOTA/IOTA-ES occultation update for (2183) Neufang / TYC 1343-02570-1 event on 2012 Sep 16, 19:10 UT Visible from New Guinea Summary ------- On 2012 Sep 16 UT, the 25 km diameter asteroid (2183) Neufang will occult a 10.3 mag star in the constellation Gemini for observers along a path across New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.3 mag to 17.6 mag (the magnitude of the asteroid) for at most 1.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 21 * date and approx. time of event: 2012 Sep 16, 19:06 - 2012 Sep 16, 19:09 UT * geocentric midpoint of event [JD]: 2456187.2992375 * magnitude of target star: 10.3 * magnitude drop [mag]: 7.3 * estimated maximum duration [s]: 1.2 * Moon: 1 % sunlit, 81° distance * Sun: 72° distance * rough path description: New Guinea The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 3.16 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .035", 71° ) * approx speed of asteroid's shadow [km/s]: 21.0344 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1343-02570-1 by 2183 Neufang on 2012 Sep 16 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 100 0 0 -22 48 11 19 6 6 0 66 -56 -22 55 57 -22 40 26 .. .. .. .. .. .. 101 0 0 -22 23 39 19 6 6 1 66 -56 -22 31 24 -22 15 53 -23 20 36 .. .. .. 102 0 0 -21 58 57 19 6 6 2 65 -55 -22 6 43 -21 51 12 -22 55 56 .. .. .. 103 0 0 -21 34 8 19 6 6 3 65 -54 -21 41 54 -21 26 22 -22 31 8 -20 37 27 104 0 0 -21 9 10 19 6 6 4 65 -54 -21 16 57 -21 1 24 -22 6 12 -20 12 28 105 0 0 -20 44 6 19 6 7 5 64 -53 -20 51 52 -20 36 20 -21 41 8 -19 47 22 106 0 0 -20 18 54 19 6 7 6 64 -52 -20 26 41 -20 11 8 -21 15 58 -19 22 10 107 0 0 -19 53 37 19 6 8 7 64 -52 -20 1 24 -19 45 51 -20 50 42 -18 56 52 108 0 0 -19 28 15 19 6 9 8 63 -51 -19 36 1 -19 20 28 -20 25 19 -18 31 29 109 0 0 -19 2 47 19 6 10 9 63 -50 -19 10 34 -18 55 1 -19 59 52 -18 6 1 110 0 0 -18 37 16 19 6 11 10 63 -49 -18 45 3 -18 29 30 -19 34 21 -17 40 30 111 0 0 -18 11 41 19 6 12 11 62 -49 -18 19 28 -18 3 55 -19 8 46 -17 14 55 112 0 0 -17 46 3 19 6 13 12 62 -48 -17 53 50 -17 38 17 -18 43 8 -16 49 18 113 0 0 -17 20 23 19 6 14 14 62 -47 -17 28 10 -17 12 37 -18 17 27 -16 23 38 114 0 0 -16 54 42 19 6 16 15 61 -46 -17 2 28 -16 46 55 -17 51 45 -15 57 57 115 0 0 -16 28 59 19 6 17 16 61 -45 -16 36 46 -16 21 13 -17 26 2 -15 32 16 116 0 0 -16 3 17 19 6 19 17 61 -45 -16 11 3 -15 55 31 -17 0 18 -15 6 34 117 0 0 -15 37 35 19 6 21 18 60 -44 -15 45 21 -15 29 49 -16 34 34 -14 40 54 118 0 0 -15 11 54 19 6 22 19 60 -43 -15 19 39 -15 4 8 -16 8 52 -14 15 14 119 0 0 -14 46 14 19 6 24 20 60 -42 -14 54 0 -14 38 29 -15 43 11 -13 49 37 120 0 0 -14 20 38 19 6 26 21 60 -41 -14 28 23 -14 12 53 -15 17 32 -13 24 2 121 0 0 -13 55 4 19 6 29 22 59 -40 -14 2 49 -13 47 20 -14 51 57 -12 58 31 122 0 0 -13 29 35 19 6 31 23 59 -39 -13 37 19 -13 21 50 -14 26 25 -12 33 3 123 0 0 -13 4 9 19 6 33 24 59 -38 -13 11 54 -12 56 25 -14 0 57 -12 7 41 124 0 0 -12 38 50 19 6 36 25 58 -38 -12 46 34 -12 31 6 -13 35 35 -11 42 23 125 0 0 -12 13 36 19 6 38 26 58 -37 -12 21 19 -12 5 52 -13 10 18 -11 17 12 126 0 0 -11 48 28 19 6 41 27 58 -36 -11 56 11 -11 40 45 -12 45 7 -10 52 8 127 0 0 -11 23 28 19 6 44 28 57 -35 -11 31 11 -11 15 46 -12 20 4 -10 27 11 128 0 0 -10 58 36 19 6 47 29 57 -34 -11 6 18 -10 50 54 -11 55 8 -10 2 22 129 0 0 -10 33 52 19 6 50 30 57 -33 -10 41 34 -10 26 10 -11 30 21 - 9 37 41 130 0 0 -10 9 17 19 6 53 31 57 -32 -10 16 58 -10 1 36 -11 5 42 - 9 13 10 131 0 0 - 9 44 52 19 6 56 33 56 -31 - 9 52 33 - 9 37 12 -10 41 14 - 8 48 49 132 0 0 - 9 20 38 19 6 59 34 56 -30 - 9 28 18 - 9 12 58 -10 16 55 - 8 24 39 133 0 0 - 8 56 34 19 7 3 35 56 -29 - 9 4 14 - 8 48 55 - 9 52 48 - 8 0 40 134 0 0 - 8 32 43 19 7 6 36 55 -28 - 8 40 22 - 8 25 4 - 9 28 52 - 7 36 52 135 0 0 - 8 9 3 19 7 9 37 55 -27 - 8 16 42 - 8 1 25 - 9 5 8 - 7 13 17 136 0 0 - 7 45 37 19 7 13 38 55 -26 - 7 53 15 - 7 37 59 - 8 41 37 - 6 49 55 137 0 0 - 7 22 23 19 7 17 39 54 -25 - 7 30 1 - 7 14 46 - 8 18 19 - 6 26 46 138 0 0 - 6 59 24 19 7 21 40 54 -24 - 7 7 1 - 6 51 48 - 7 55 15 - 6 3 51 139 0 0 - 6 36 40 19 7 24 41 54 -23 - 6 44 16 - 6 29 4 - 7 32 26 - 5 41 11 140 0 0 - 6 14 10 19 7 28 42 53 -22 - 6 21 46 - 6 6 35 - 7 9 52 - 5 18 47 141 0 0 - 5 51 56 19 7 32 43 53 -21 - 5 59 31 - 5 44 22 - 6 47 33 - 4 56 38 142 0 0 - 5 29 58 19 7 37 44 52 -20 - 5 37 33 - 5 22 25 - 6 25 30 - 4 34 45 143 0 0 - 5 8 17 19 7 41 45 52 -19 - 5 15 51 - 5 0 44 - 6 3 44 - 4 13 9 144 0 0 - 4 46 53 19 7 45 46 52 -18 - 4 54 26 - 4 39 21 - 5 42 15 - 3 51 50 145 0 0 - 4 25 47 19 7 49 47 51 -17 - 4 33 19 - 4 18 15 - 5 21 3 - 3 30 48 146 0 0 - 4 4 59 19 7 54 48 51 -16 - 4 12 30 - 3 57 28 - 5 0 9 - 3 10 5 147 0 0 - 3 44 29 19 7 58 49 50 -15 - 3 51 59 - 3 36 58 - 4 39 34 - 2 49 40 148 0 0 - 3 24 18 19 8 3 50 50 -14 - 3 31 48 - 3 16 48 - 4 19 18 - 2 29 35 149 0 0 - 3 4 26 19 8 7 51 49 -13 - 3 11 55 - 2 56 57 - 3 59 21 - 2 9 48 150 0 0 - 2 44 54 19 8 12 52 48 -12 - 2 52 23 - 2 37 26 - 3 39 44 - 1 50 22 151 0 0 - 2 25 43 19 8 17 53 48 -11 - 2 33 11 - 2 18 15 - 3 20 27 - 1 31 15 152 0 0 - 2 6 52 19 8 21 54 47 -10 - 2 14 19 - 1 59 25 - 3 1 31 - 1 12 30 153 0 0 - 1 48 21 19 8 26 55 46 -9 - 1 55 48 - 1 40 56 - 2 42 56 - 0 54 4 154 0 0 - 1 30 12 19 8 31 56 46 -8 - 1 37 38 - 1 22 47 - 2 24 41 - 0 36 1 155 0 0 - 1 12 25 19 8 36 57 45 -7 - 1 19 50 - 1 5 1 - 2 6 49 - 0 18 18 156 0 0 - 0 55 0 19 8 41 58 44 -6 - 1 2 24 - 0 47 36 - 1 49 18 - 0 0 58 157 0 0 - 0 37 56 19 8 46 59 43 -4 - 0 45 20 - 0 30 33 - 1 32 9 0 16 0 158 0 0 - 0 21 15 19 8 51 59 42 -3 - 0 28 38 - 0 13 53 - 1 15 23 0 32 36 159 0 0 - 0 4 57 19 8 56 60 41 -2 - 0 12 19 0 2 24 - 0 59 0 0 48 49 160 0 0 0 10 58 19 9 1 61 40 -1 0 3 36 0 18 19 - 0 43 0 1 4 39 161 0 0 0 26 30 19 9 6 62 39 0 0 19 9 0 33 50 - 0 27 24 1 20 6 Uncertainty in time = +/- 4 secs Prediction of 2012 Apr 8.0 Data for the target star ------------------------ * name: TYC 1343-02570-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 50 45.5637 DE: +21 47 23.075 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 10.3 * B mag [mag]: 11.4 * Apparent position with proper motion RA(deg): 102.8828951689 DE(deg): 21.7728801394 * Equation of equinoxes (radians) : 0.000066577775437 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2183) Neufang approx. diameter [km]: 25 approx. diameter ["]: .011 distance from Earth [AU]: 3.24700 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 800 number of rejected observations: 22 time covered by the observations: 1959 Jul 26 - 2011 Dec 10 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.029, 66° remarks: * orbital elements for (2183) Neufang : Mean anomaly = 73.38782921 deg Arg. of pericenter = 240.13028067 deg Long. of node = 87.37358272 deg Inclination = 18.10522845 deg Eccentricity = 0.37173031 Semimajor axis = 3.00472315 AU Perihelion dist = 1.88777647 AU Mag: H = 11.62, G = 0.15 Epoch of elements : MJD 56186.79900000 TDT (2012 Sep 16.799) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 16 2183 Neufang 19h 10.9m UT 10.3 6 50 45.564 21 47 23.08TYC 1343-02570-1 11.4 17.6 25 1.2 3.247 2.291 3.83 178.8291 21.788 -109.08 2.26 19.1817 0.03601 -0.30235 11.78781 1.41479 -0.00551 0.00045 2000 72.1012322012 910.00000240.130281 87.373583 18.1052280.37173031 3.0047232 1.887776511.7 5.00.15 RATE 1.8923330 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.035 71 4.16 0.034 0 0-3-5 056025.0020120916_2570-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 22, 03:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org