IOTA/IOTA-ES occultation update for (236) Honoria / TYC 0004-01216-1 event on 2012 Aug 26, 08:59 UT Visible from Alaska Summary ------- On 2012 Aug 26 UT, the 81 km diameter asteroid (236) Honoria will occult a 10.7 mag star in the constellation Pisces for observers along a path across Alaska. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 11.5 mag (the magnitude of the asteroid) for at most 14.9 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: 97 * date and approx. time of event: 2012 Aug 26, 08:52 - 2012 Aug 26, 09:05 UT * geocentric midpoint of event [JD]: 2456165.87441667 * magnitude of target star: 10.7 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 14.9 * Moon: 70 % sunlit, 96° distance * Sun: 151° distance * rough path description: Alaska The occultation path -------------------- * approximate projected width [km]: 236 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .028", 80° ) * approx speed of asteroid's shadow [km/s]: 5.4575 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0004-01216-1 by 236 Honoria on 2012 Aug 26 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 157 56 55 62 59 44 8 52 39 2 84 0 168 35 29 63 15 42 ... .. .. .. .. .. 173 7 14 63 10 35 ... .. .. .. .. .. 164 42 36 62 41 35 8 52 50 5 90 -3 171 30 45 62 40 14 ... .. .. .. .. .. 175 19 28 62 32 20 ... .. .. .. .. .. 168 21 41 62 10 4 8 53 0 6 93 -5 173 48 50 62 3 6 157 52 25 61 53 37 177 8 58 61 53 32 ... .. .. .. .. .. 171 2 29 61 35 12 8 53 11 8 95 -6 175 42 6 61 25 12 164 18 49 61 35 44 178 41 24 61 14 33 ... .. .. .. .. .. 173 10 5 60 58 52 8 53 21 9 97 -7 177 17 12 60 46 58 167 45 14 61 4 55 -179 59 33 60 35 36 160 46 42 60 56 52 174 55 14 60 21 49 8 53 32 10 98 -8 178 38 15 60 8 41 170 16 42 60 30 53 -178 51 18 59 56 47 165 17 2 60 31 39 176 23 49 59 44 29 8 53 42 11 100 -9 179 48 4 59 30 28 172 17 0 59 55 25 -177 52 1 59 18 12 168 10 55 59 59 55 177 39 31 59 7 3 8 53 53 11 101 -10 -179 11 23 58 52 25 173 56 15 59 19 16 -177 0 17 58 39 54 170 23 10 59 25 55 178 44 51 58 29 42 8 54 3 12 102 -11 -178 18 35 58 14 36 175 19 56 58 42 48 -176 15 0 58 1 54 172 9 55 58 50 49 179 41 36 57 52 29 8 54 14 13 102 -12 -177 32 24 57 37 4 176 31 30 58 6 14 -175 35 18 57 24 15 173 38 49 58 15 12 -179 28 52 57 15 28 8 54 25 13 103 -13 -176 51 55 56 59 50 177 33 17 57 29 41 -175 0 29 56 46 56 174 54 13 57 39 20 -178 45 32 56 38 42 8 54 35 14 103 -13 -176 16 25 56 22 55 178 26 59 56 53 16 -174 29 58 56 9 58 175 58 57 57 3 25 -178 7 33 56 2 12 8 54 46 14 104 -14 -175 45 18 55 46 18 179 13 50 56 17 1 -174 3 16 55 33 21 176 54 58 56 27 32 -177 34 16 55 25 59 8 54 56 15 104 -15 -175 18 3 55 10 1 179 54 48 55 40 59 -173 39 58 54 57 5 177 43 43 55 51 46 -177 5 7 54 50 3 8 55 7 15 104 -15 -174 54 18 54 34 4 -179 29 19 55 5 10 -173 19 45 54 21 9 178 26 16 55 16 10 -176 39 39 54 14 25 8 55 17 16 105 -16 -174 33 39 53 58 26 -178 57 55 54 29 37 -173 2 18 53 45 32 179 3 28 54 40 46 -176 17 30 53 39 4 8 55 28 16 105 -17 -174 15 50 53 23 6 -178 30 28 53 54 19 -172 47 23 53 10 16 179 35 59 54 5 34 -175 58 20 53 4 1 8 55 38 17 105 -17 -174 0 34 52 48 5 -178 6 34 53 19 18 -172 34 45 52 35 18 -179 55 38 53 30 37 -175 41 52 52 29 15 8 55 49 17 105 -18 -173 47 40 52 13 22 -177 45 52 52 44 32 -172 24 15 52 0 39 -179 30 56 52 55 54 -175 27 52 51 54 47 8 56 0 17 105 -18 -173 36 54 51 38 57 -177 28 1 52 10 2 -172 15 41 51 26 18 -179 9 31 52 21 26 -175 16 8 51 20 35 8 56 10 17 105 -19 -173 28 7 51 4 50 -177 12 49 51 35 48 -172 8 54 50 52 15 -178 51 5 51 47 13 -175 6 29 50 46 39 8 56 21 18 105 -19 -173 21 9 50 30 59 -177 0 0 51 1 50 -172 3 48 50 18 28 -178 35 22 51 13 14 -174 58 45 50 13 0 8 56 31 18 105 -20 -173 15 54 49 57 24 -176 49 23 50 28 7 -172 0 16 49 44 58 -178 22 8 50 39 30 -174 52 49 49 39 35 8 56 42 18 105 -20 -173 12 14 49 24 5 -176 40 48 49 54 39 -171 58 10 49 11 44 -178 11 10 50 6 0 -174 48 32 49 6 26 8 56 52 18 105 -21 -173 10 3 48 51 1 -176 34 6 49 21 26 -171 57 26 48 38 45 -178 2 17 49 32 45 -174 45 49 48 33 32 8 57 3 19 105 -21 -173 9 15 48 18 12 -176 29 10 48 48 26 -171 57 59 48 6 1 -177 55 22 48 59 43 -174 44 33 48 0 51 8 57 13 19 105 -22 -173 9 46 47 45 38 -176 25 53 48 15 41 -171 59 45 47 33 31 -177 50 16 48 26 55 -174 44 40 47 28 25 8 57 24 19 105 -22 -173 11 32 47 13 17 -176 24 8 47 43 9 -172 2 39 47 1 16 -177 46 51 47 54 20 -174 46 6 46 56 11 8 57 35 19 105 -22 -173 14 28 46 41 10 -176 23 50 47 10 51 -172 6 39 46 29 13 -177 45 2 47 21 58 -174 48 45 46 24 11 8 57 45 19 104 -23 -173 18 30 46 9 15 -176 24 54 46 38 45 -172 11 41 45 57 24 -177 44 43 46 49 48 -174 52 34 45 52 23 8 57 56 19 104 -23 -173 23 37 45 37 34 -176 27 17 46 6 51 -172 17 42 45 25 48 -177 45 50 46 17 51 -174 57 31 45 20 47 8 58 6 20 104 -23 -173 29 45 45 6 4 -176 30 54 45 35 10 -172 24 40 44 54 23 -177 48 17 45 46 5 -175 3 32 44 49 23 8 58 17 20 104 -24 -173 36 51 44 34 46 -176 35 42 45 3 39 -172 32 33 44 23 11 -177 52 2 45 14 30 -175 10 36 44 18 10 8 58 27 20 103 -24 -173 44 54 44 3 40 -176 41 39 44 32 20 -172 41 19 43 52 9 -177 57 1 44 43 7 -175 18 39 43 47 8 8 58 38 20 103 -24 -173 53 52 43 32 44 -176 48 41 44 1 12 -172 50 56 43 21 19 -178 3 11 44 11 54 -175 27 39 43 16 16 8 58 48 20 103 -25 -174 3 43 43 1 59 -176 56 47 43 30 14 -173 1 23 42 50 39 -178 10 30 43 40 51 -175 37 36 42 45 35 8 58 59 20 103 -25 -174 14 25 42 31 24 -177 5 54 42 59 26 -173 12 38 42 20 9 -178 18 55 43 9 59 -175 48 28 42 15 3 8 59 10 20 102 -25 -174 25 57 42 0 59 -177 16 1 42 28 48 -173 24 40 41 49 49 -178 28 24 42 39 16 -176 0 13 41 44 41 8 59 20 20 102 -26 -174 38 19 41 30 43 -177 27 7 41 58 19 -173 37 28 41 19 38 -178 38 56 42 8 42 -176 12 50 41 14 27 8 59 31 20 102 -26 -174 51 28 41 0 36 -177 39 10 41 27 59 -173 51 1 40 49 36 -178 50 30 41 38 16 -176 26 19 40 44 22 8 59 41 20 102 -26 -175 5 26 40 30 38 -177 52 9 40 57 48 -174 5 19 40 19 44 -179 3 5 41 8 0 -176 40 39 40 14 26 8 59 52 20 101 -26 -175 20 9 40 0 48 -178 6 3 40 27 44 -174 20 21 39 49 59 -179 16 39 40 37 51 -176 55 49 39 44 37 9 0 2 20 101 -27 -175 35 40 39 31 6 -178 20 53 39 57 49 -174 36 7 39 20 22 -179 31 13 40 7 50 -177 11 49 39 14 56 9 0 13 20 101 -27 -175 51 56 39 1 32 -178 36 37 39 28 1 -174 52 36 38 50 54 -179 46 45 39 37 56 -177 28 39 38 45 22 9 0 24 19 100 -27 -176 8 59 38 32 5 -178 53 16 38 58 20 -175 9 49 38 21 32 179 56 43 39 8 9 -177 46 20 38 15 55 9 0 34 19 100 -27 -176 26 47 38 2 45 -179 10 50 38 28 45 -175 27 45 37 52 18 179 39 13 38 38 29 -178 4 50 37 46 35 9 0 45 19 100 -27 -176 45 22 37 33 32 -179 29 19 37 59 17 -175 46 24 37 23 10 179 20 43 38 8 55 -178 24 12 37 17 21 9 0 55 19 99 -27 -177 4 44 37 4 25 -179 48 43 37 29 55 -176 5 47 36 54 8 179 1 12 37 39 27 -178 44 24 36 48 12 9 1 6 19 99 -28 -177 24 53 36 35 24 179 50 56 37 0 39 -176 25 55 36 25 13 178 40 41 37 10 4 -179 5 30 36 19 9 9 1 16 19 99 -28 -177 45 49 36 6 29 179 29 37 36 31 28 -176 46 47 35 56 23 178 19 7 36 40 46 -179 27 28 35 50 12 9 1 27 19 98 -28 -178 7 35 35 37 39 179 7 19 36 2 22 -177 8 25 35 27 39 177 56 28 36 11 33 -179 50 21 35 21 18 9 1 37 18 98 -28 -178 30 10 35 8 54 178 44 1 35 33 20 -177 30 50 34 59 0 177 32 43 35 42 24 179 45 49 34 52 30 9 1 48 18 97 -28 -178 53 36 34 40 13 178 19 40 35 4 22 -177 54 2 34 30 25 177 7 49 35 13 18 179 21 2 34 23 45 9 1 59 18 97 -28 -179 17 55 34 11 37 177 54 14 34 35 28 -178 18 4 34 1 55 176 41 43 34 44 16 178 55 13 33 55 3 9 2 9 18 97 -28 -179 43 9 33 43 4 177 27 39 34 6 37 -178 42 56 33 33 29 176 14 22 34 15 16 178 28 22 33 26 25 9 2 20 17 96 -28 179 50 41 33 14 35 176 59 54 33 37 48 -179 8 41 33 5 6 175 45 41 33 46 18 178 0 24 32 57 49 9 2 30 17 96 -28 179 23 32 32 46 9 176 30 53 33 9 2 -179 35 21 32 36 47 175 15 34 33 17 22 177 31 17 32 29 16 9 2 41 17 95 -28 178 55 20 32 17 46 176 0 31 32 40 17 179 57 3 32 8 31 174 43 57 32 48 26 177 0 56 32 0 44 9 2 51 16 95 -28 178 26 4 31 49 24 175 28 44 32 11 32 179 28 27 31 40 17 174 10 41 32 19 30 176 29 15 31 32 13 9 3 2 16 95 -28 177 55 38 31 21 4 174 55 24 31 42 48 178 58 47 31 12 5 173 35 37 31 50 33 175 56 10 31 3 42 9 3 12 16 94 -28 177 23 59 30 52 46 174 20 23 31 14 2 178 28 1 30 43 54 172 58 35 31 21 34 175 21 32 30 35 10 9 3 23 15 94 -28 176 51 1 30 24 27 173 43 31 30 45 15 177 56 4 30 15 45 172 19 21 30 52 32 174 45 15 30 6 38 9 3 34 15 93 -27 176 16 38 29 56 9 173 4 37 30 16 25 177 22 51 29 47 35 171 37 37 30 23 25 174 7 7 29 38 3 9 3 44 14 93 -27 175 40 42 29 27 49 172 23 25 29 47 31 176 48 16 29 19 26 170 53 2 29 54 10 173 26 56 29 9 25 9 3 55 14 93 -27 175 3 6 28 59 28 171 39 36 29 18 31 176 12 11 28 51 15 170 5 6 29 24 47 172 44 28 28 40 41 9 4 5 13 92 -27 174 23 38 28 31 3 170 52 46 28 49 22 175 34 30 28 23 3 169 13 8 28 55 10 171 59 21 28 11 52 9 4 16 13 92 -27 173 42 5 28 2 35 170 2 20 28 20 3 174 55 1 27 54 48 168 16 12 28 25 17 171 11 12 27 42 53 9 4 26 12 91 -26 172 58 12 27 34 1 169 7 34 27 50 29 174 13 34 27 26 29 167 12 49 27 54 59 170 19 26 27 13 44 9 4 37 11 91 -26 172 11 38 27 5 20 168 7 19 27 20 35 173 29 52 26 58 5 166 0 36 27 24 5 169 23 17 26 44 18 9 4 47 10 90 -25 171 21 56 26 36 30 166 59 53 26 50 12 172 43 37 26 29 34 164 34 58 26 52 14 168 21 36 26 14 33 9 4 58 10 90 -25 170 28 31 26 7 27 165 42 15 26 19 7 171 54 26 26 0 55 162 44 53 26 18 34 167 12 37 25 44 18 9 5 9 9 89 -24 169 30 34 25 38 8 164 8 23 25 46 52 171 1 45 25 32 3 159 32 55 25 38 38 165 53 20 25 13 19 9 5 19 7 89 -23 168 26 51 25 8 27 162 1 20 25 12 6 170 4 53 25 2 57 ... .. .. .. .. .. 164 17 36 24 41 9 9 5 30 6 88 -22 167 15 31 24 38 14 ... .. .. .. .. .. 169 2 46 24 33 31 ... .. .. .. .. .. 162 8 18 24 6 26 9 5 40 4 87 -21 165 53 14 24 7 15 ... .. .. .. .. .. 167 53 50 24 3 37 ... .. .. .. .. .. Uncertainty in time = +/- 7 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 0004-01216-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 03 46.0554 DE: +04 19 51.346 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .023 ) * V mag [mag]: 10.7 * B mag [mag]: 11.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (236) Honoria approx. diameter [km]: 81 approx. diameter ["]: .083 distance from Earth [AU]: 1.34700 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 962 number of rejected observations: 131 time covered by the observations: 1903 May 05 - 2012 Jul 19 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.015, 75° remarks: * orbital elements for (236) Honoria : Mean anomaly = 352.63511067 deg Arg. of pericenter = 174.83309750 deg Long. of node = 186.05387981 deg Inclination = 7.68309022 deg Eccentricity = 0.18726187 Semimajor axis = 2.79968424 AU Perihelion dist = 2.27541013 AU Mag: H = 7.98, G = -0.02 Epoch of elements : MJD 56165.37400000 TDT (2012 Aug 26.374) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 26 236 Honoria 8h 59.2m UT 10.7 0 3 46.055 4 19 51.35TYC 0004-01216-1 11.1 11.5 81 14.9 1.347 -0.924 -14.63 -108.8654 4.336 45.65 10.21 8.9860 -0.68297 0.64477 -2.11467 -2.23984 -0.00226 -0.00131 2000 351.5044352012 821.00000174.833097186.053880 7.6830900.18726187 2.7996842 2.2754101 8.2 5.0-.02 RATE 2.1039750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.028 80 1.39 0.032 0 0 4-4 056129.0020120826_1216-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 14:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org