IOTA/IOTA-ES occultation update for (306) Unitas / TYC 0058-00658-1 event on 2012 Nov 14, 19:17 UT Visible from Russia, SW Asia, N Africa Summary ------- On 2012 Nov 14 UT, the 60 km diameter asteroid (306) Unitas will occult a 11.5 mag star in the constellation Cetus for observers along a path across Russia, SW Asia, N Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 12.0 mag (the magnitude of the asteroid) for at most 5.8 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: 93 * date and approx. time of event: 2012 Nov 14, 19:09 - 2012 Nov 14, 19:26 UT * geocentric midpoint of event [JD]: 2456246.30410833 * magnitude of target star: 11.5 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 5.8 * Moon: 1 % sunlit, 156° distance * Sun: 165° distance * rough path description: Russia, SW Asia, N Africa The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .029", 83° ) * approx speed of asteroid's shadow [km/s]: 10.3955 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0058-00658-1 by 306 Unitas on 2012 Nov 14 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 - 32 0 0 25 51 7 19 26 1 0 86 -2 26 11 44 25 30 34 26 31 38 .. .. .. - 31 0 0 25 55 49 19 26 0 1 86 -3 26 16 27 25 35 17 26 36 22 25 15 39 - 30 0 0 26 0 47 19 26 0 2 86 -4 26 21 25 25 40 14 26 41 20 25 20 36 - 29 0 0 26 5 58 19 25 59 3 87 -5 26 26 37 25 45 25 26 46 32 25 25 46 - 28 0 0 26 11 24 19 25 59 4 87 -6 26 32 4 25 50 51 26 51 59 25 31 12 - 27 0 0 26 17 4 19 25 58 5 88 -7 26 37 44 25 56 30 26 57 40 25 36 51 - 26 0 0 26 22 58 19 25 57 6 88 -7 26 43 39 26 2 24 27 3 35 25 42 44 - 25 0 0 26 29 6 19 25 55 7 89 -8 26 49 47 26 8 31 27 9 43 25 48 51 - 24 0 0 26 35 28 19 25 54 8 89 -9 26 56 9 26 14 52 27 16 6 25 55 11 - 23 0 0 26 42 3 19 25 52 9 90 -10 27 2 44 26 21 27 27 22 42 26 1 45 - 22 0 0 26 48 51 19 25 50 9 90 -11 27 9 33 26 28 14 27 29 31 26 8 33 - 21 0 0 26 55 52 19 25 48 10 90 -12 27 16 35 26 35 15 27 36 34 26 15 33 - 20 0 0 27 3 7 19 25 46 11 91 -13 27 23 50 26 42 29 27 43 49 26 22 46 - 19 0 0 27 10 34 19 25 43 12 91 -14 27 31 18 26 49 55 27 51 17 26 30 12 - 18 0 0 27 18 13 19 25 41 13 92 -15 27 38 58 26 57 35 27 58 58 26 37 51 - 17 0 0 27 26 6 19 25 38 14 92 -15 27 46 51 27 5 26 28 6 52 26 45 42 - 16 0 0 27 34 10 19 25 35 15 93 -16 27 54 56 27 13 30 28 14 57 26 53 45 - 15 0 0 27 42 26 19 25 32 16 93 -17 28 3 13 27 21 45 28 23 15 27 2 0 - 14 0 0 27 50 54 19 25 29 16 94 -18 28 11 41 27 30 13 28 31 44 27 10 27 - 13 0 0 27 59 34 19 25 25 17 94 -19 28 20 22 27 38 52 28 40 25 27 19 5 - 12 0 0 28 8 25 19 25 21 18 95 -20 28 29 14 27 47 42 28 49 18 27 27 55 - 11 0 0 28 17 28 19 25 18 19 95 -21 28 38 17 27 56 44 28 58 22 27 36 56 - 10 0 0 28 26 41 19 25 14 20 96 -22 28 47 31 28 5 57 29 7 36 27 46 8 - 9 0 0 28 36 5 19 25 10 21 97 -23 28 56 56 28 15 20 29 17 2 27 55 30 - 8 0 0 28 45 39 19 25 5 22 97 -23 29 6 31 28 24 54 29 26 38 28 5 4 - 7 0 0 28 55 24 19 25 1 22 98 -24 29 16 17 28 34 38 29 36 24 28 14 47 - 6 0 0 29 5 19 19 24 56 23 98 -25 29 26 12 28 44 32 29 46 21 28 24 41 - 5 0 0 29 15 24 19 24 52 24 99 -26 29 36 18 28 54 37 29 56 27 28 34 44 - 4 0 0 29 25 39 19 24 47 25 100 -27 29 46 33 29 4 50 30 6 43 28 44 57 - 3 0 0 29 36 3 19 24 42 26 100 -28 29 56 58 29 15 13 30 17 9 28 55 20 - 2 0 0 29 46 36 19 24 37 26 101 -29 30 7 32 29 25 46 30 27 43 29 5 51 - 1 0 0 29 57 18 19 24 31 27 101 -29 30 18 14 29 36 27 30 38 27 29 16 32 0 0 0 30 8 8 19 24 26 28 102 -30 30 29 6 29 47 17 30 49 19 29 27 21 1 0 0 30 19 7 19 24 20 29 103 -31 30 40 6 29 58 15 31 0 19 29 38 18 2 0 0 30 30 15 19 24 15 30 104 -32 30 51 14 30 9 22 31 11 28 29 49 24 3 0 0 30 41 30 19 24 9 30 104 -33 31 2 30 30 20 36 31 22 45 30 0 38 4 0 0 30 52 53 19 24 3 31 105 -34 31 13 53 30 31 58 31 34 9 30 11 59 5 0 0 31 4 23 19 23 57 32 106 -35 31 25 24 30 43 28 31 45 41 30 23 28 6 0 0 31 16 1 19 23 50 33 106 -35 31 37 3 30 55 4 31 57 20 30 35 4 7 0 0 31 27 45 19 23 44 33 107 -36 31 48 48 31 6 48 32 9 6 30 46 47 8 0 0 31 39 36 19 23 38 34 108 -37 32 0 40 31 18 38 32 20 58 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50 47 45 50 6 46 51 7 34 49 47 13 137 0 0 50 26 47 19 10 13 14 260 -28 50 47 20 50 6 20 51 7 8 49 46 48 138 0 0 50 26 11 19 10 11 13 261 -27 50 46 43 50 5 44 51 6 32 49 46 11 139 0 0 50 25 23 19 10 9 12 261 -27 50 45 56 50 4 57 51 5 44 49 45 24 140 0 0 50 24 25 19 10 7 12 262 -26 50 44 57 50 3 58 51 4 46 49 44 26 141 0 0 50 23 16 19 10 5 11 263 -25 50 43 48 50 2 49 51 3 37 49 43 16 142 0 0 50 21 55 19 10 4 11 264 -25 50 42 28 50 1 28 51 2 17 49 41 56 143 0 0 50 20 24 19 10 2 10 265 -24 50 40 57 49 59 57 51 0 46 49 40 24 144 0 0 50 18 42 19 10 1 9 265 -23 50 39 15 49 58 15 50 59 4 49 38 42 145 0 0 50 16 49 19 9 59 9 266 -23 50 37 22 49 56 21 50 57 11 49 36 48 146 0 0 50 14 45 19 9 58 8 267 -22 50 35 18 49 54 17 50 55 8 49 34 44 147 0 0 50 12 30 19 9 57 7 268 -21 50 33 3 49 52 2 50 52 53 49 32 28 148 0 0 50 10 4 19 9 56 7 268 -21 50 30 38 49 49 35 50 50 28 49 30 2 149 0 0 50 7 27 19 9 55 6 269 -20 50 28 1 49 46 58 50 47 51 49 27 24 150 0 0 50 4 39 19 9 54 6 270 -20 50 25 13 49 44 10 50 45 4 49 24 35 151 0 0 50 1 39 19 9 53 5 271 -19 50 22 14 49 41 10 50 42 5 49 21 35 152 0 0 49 58 29 19 9 52 4 272 -18 50 19 4 49 38 0 50 38 56 49 18 25 153 0 0 49 55 8 19 9 52 4 272 -18 50 15 44 49 34 38 50 35 35 49 15 3 154 0 0 49 51 36 19 9 51 3 273 -17 50 12 12 49 31 6 50 32 4 49 11 30 155 0 0 49 47 53 19 9 51 2 274 -16 50 8 29 49 27 22 50 28 22 49 7 46 156 0 0 49 43 59 19 9 51 2 275 -16 50 4 36 49 23 27 50 24 29 49 3 51 157 0 0 49 39 53 19 9 50 1 275 -15 50 0 31 49 19 22 50 20 24 48 59 44 158 0 0 49 35 37 19 9 50 0 276 -14 49 56 15 49 15 5 50 16 9 48 55 27 Uncertainty in time = +/- 3 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 0058-00658-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 00 31.8565 DE: +04 10 21.043 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .026 ) * V mag [mag]: 11.5 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (306) Unitas approx. diameter [km]: 60 approx. diameter ["]: .060 distance from Earth [AU]: 1.38500 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 975 number of rejected observations: 142 time covered by the observations: 1902 Mar 13 - 2012 Oct 02 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.013, 74° remarks: * orbital elements for (306) Unitas : Mean anomaly = 80.68550889 deg Arg. of pericenter = 167.76992717 deg Long. of node = 141.98838259 deg Inclination = 7.26876901 deg Eccentricity = 0.14973762 Semimajor axis = 2.35901908 AU Perihelion dist = 2.00578517 AU Mag: H = 8.76, G = 0.15 Epoch of elements : MJD 56245.80400000 TDT (2012 Nov 14.804) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 14 306 Unitas 19h 17.9m UT 11.5 3 0 31.857 4 10 21.04TYC 0058-00658-1 11.7 12.0 60 5.8 1.385 -2.436 -7.66 61.3616 4.176 -113.34 -18.48 19.2986 -0.12554 0.59687 -5.74189 -1.20762 0.00049 0.00142 2000 79.106683201211 9.00000167.769927141.988383 7.2687690.14973762 2.3590191 2.0057852 9.0 5.00.15 RATE 2.7202380 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.029 83 1.48 0.029 0 0-5 3 056226.0020121114_0658-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org