IOTA/IOTA-ES occultation update for (3092) Herodotus / UCAC2 16648039 event on 2012 Aug 09, 06:31 UT Visible from Hawaii Summary ------- On 2012 Aug 09 UT, the 34 km diameter asteroid (3092) Herodotus will occult a 11.7 mag star in the constellation Scorpius for observers along a path across Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 16.9 mag (the magnitude of the asteroid) for at most 7.5 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: 11 * date and approx. time of event: 2012 Aug 09, 06:12 - 2012 Aug 09, 06:57 UT * geocentric midpoint of event [JD]: 2456148.77362917 * magnitude of target star: 11.7 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 7.5 * Moon: 55 % sunlit, 143° distance * Sun: 118° distance * rough path description: Hawaii The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 6.16 * 1 sigma uncertainty interval [seconds]: +/- 41.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .099 +/- .088) * 1 sigma uncertainty ellipse (major, minor, PA): ( .099", .087", 97° ) * approx speed of asteroid's shadow [km/s]: 4.4903 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 16648039 by 3092 Herodotus on 2012 Aug 9 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 ' " Longitude Longitude Longitude Longitude -147 45 0 52 0 0 6 57 38 1 197 -12 -147 29 25 -148 0 33 ... .. .. -151 10 48 -148 14 9 51 0 0 6 57 38 2 197 -13 -147 58 56 -148 29 20 -144 49 54 -151 35 7 -148 41 53 50 0 0 6 57 37 3 196 -13 -148 27 1 -148 56 43 -145 22 25 -151 58 18 -149 8 18 49 0 0 6 57 36 4 196 -14 -148 53 46 -149 22 49 -145 53 20 -152 20 27 -149 33 30 48 0 0 6 57 34 5 196 -14 -149 19 17 -149 47 42 -146 22 45 -152 41 37 -149 57 34 47 0 0 6 57 32 6 195 -15 -149 43 38 -150 11 28 -146 50 47 -153 1 52 -150 20 33 46 0 0 6 57 29 7 195 -15 -150 6 54 -150 34 12 -147 17 32 -153 21 16 -150 42 34 45 0 0 6 57 26 8 195 -16 -150 29 10 -150 55 56 -147 43 4 -153 39 53 -151 3 38 44 0 0 6 57 22 9 195 -16 -150 50 29 -151 16 46 -148 7 29 -153 57 44 -151 23 50 43 0 0 6 57 18 10 194 -17 -151 10 55 -151 36 44 -148 30 51 -154 14 54 -151 43 12 42 0 0 6 57 13 11 194 -17 -151 30 30 -151 55 53 -148 53 13 -154 31 23 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54 -158 31 44 3 0 0 6 49 4 51 191 -30 -158 22 30 -158 40 59 -156 28 25 -160 34 44 -158 37 37 2 0 0 6 48 45 52 191 -30 -158 28 23 -158 46 51 -156 34 25 -160 40 29 -158 43 24 1 0 0 6 48 25 53 191 -30 -158 34 11 -158 52 38 -156 40 18 -160 46 12 -158 49 7 0 0 0 6 48 5 54 191 -31 -158 39 53 -158 58 20 -156 46 3 -160 51 52 -158 54 44 - 1 0 0 6 47 45 55 191 -31 -158 45 31 -159 3 58 -156 51 42 -160 57 30 -159 0 18 - 2 0 0 6 47 24 56 191 -31 -158 51 5 -159 9 32 -156 57 14 -161 3 6 -159 5 49 - 3 0 0 6 47 3 57 191 -31 -158 56 35 -159 15 3 -157 2 41 -161 8 41 -159 11 16 - 4 0 0 6 46 42 58 191 -31 -159 2 2 -159 20 31 -157 8 2 -161 14 15 -159 16 41 - 5 0 0 6 46 21 59 191 -31 -159 7 26 -159 25 56 -157 13 19 -161 19 50 -159 22 4 - 6 0 0 6 46 0 60 191 -31 -159 12 48 -159 31 20 -157 18 31 -161 25 24 -159 27 26 - 7 0 0 6 45 38 61 191 -31 -159 18 9 -159 36 43 -157 23 39 -161 31 0 -159 32 46 - 8 0 0 6 45 16 62 191 -31 -159 23 28 -159 42 5 -157 28 44 -161 36 37 -159 38 7 - 9 0 0 6 44 54 63 191 -31 -159 28 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17 54 -75 8 21 80 0 0 -77 32 58 6 13 16 28 128 -3 -77 44 44 -77 21 11 -80 9 48 -74 55 54 79 0 0 -77 22 10 6 13 12 28 129 -3 -77 34 7 -77 10 13 -80 1 17 -74 42 49 78 0 0 -77 10 50 6 13 9 28 130 -3 -77 22 57 -76 58 42 -79 52 20 -74 29 3 77 0 0 -76 58 54 6 13 6 27 131 -3 -77 11 13 -76 46 35 -79 42 55 -74 14 36 76 0 0 -76 46 22 6 13 2 27 132 -3 -76 58 53 -76 33 51 -79 33 2 -73 59 24 75 0 0 -76 33 10 6 12 58 27 133 -3 -76 45 54 -76 20 27 -79 22 37 -73 43 24 74 0 0 -76 19 17 6 12 55 26 134 -2 -76 32 14 -76 6 20 -79 11 39 -73 26 34 73 0 0 -76 4 40 6 12 51 26 135 -2 -76 17 51 -75 51 29 -79 0 7 -73 8 51 72 0 0 -75 49 15 6 12 47 26 136 -2 -76 2 41 -75 35 50 -78 47 57 -72 50 10 71 0 0 -75 33 0 6 12 43 25 137 -2 -75 46 41 -75 19 19 -78 35 7 -72 30 28 70 0 0 -75 15 52 6 12 39 25 138 -2 -75 29 49 -75 1 54 -78 21 35 -72 9 41 69 0 0 -74 57 46 6 12 35 25 139 -1 -75 12 0 -74 43 31 -78 7 17 -71 47 45 68 0 0 -74 38 38 6 12 30 24 140 -1 -74 53 10 -74 24 5 -77 52 10 -71 24 34 67 0 0 -74 18 23 6 12 26 24 141 -1 -74 33 15 -74 3 32 -77 36 11 -71 0 3 66 0 0 -73 56 58 6 12 21 23 142 -1 -74 12 10 -73 41 46 -77 19 15 -70 34 6 65 0 0 -73 34 16 6 12 17 23 143 0 -73 49 49 -73 18 42 -77 1 18 -70 6 37 64 0 0 -73 10 10 6 12 12 22 144 0 -73 26 6 -72 54 14 -76 42 16 -69 37 27 Uncertainty in time = +/- 47 secs Prediction of 2012 Apr 8.0 Data for the target star ------------------------ * name: UCAC2 16648039 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 53 27.0322 DE: -35 42 07.528 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .071, .071 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 253.5812801263 DE(deg): -35.7228264289 * Equation of equinoxes (radians) : 0.000072443626328 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3092) Herodotus approx. diameter [km]: 34 approx. diameter ["]: .016 distance from Earth [AU]: 2.96400 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 896 number of rejected observations: 15 time covered by the observations: 1960 Sep 24 - 2011 May 09 1 sigma uncertainty ellipse (major, minor, PA): 0.069, 0.051, 104° remarks: * orbital elements for (3092) Herodotus : Mean anomaly = 273.24080341 deg Arg. of pericenter = 3.14229965 deg Long. of node = 8.59891568 deg Inclination = 10.93856765 deg Eccentricity = 0.12258663 Semimajor axis = 3.53286458 AU Perihelion dist = 3.09978261 AU Mag: H = 11.18, G = 0.15 Epoch of elements : MJD 56148.27200000 TDT (2012 Aug 09.272) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 9 3092 Herodotus 6h 34.0m UT 11.7 16 53 27.032-35 42 7.53UCAC2 16648039 0.0 16.9 34 7.5 2.964 0.135 7.34 -163.3066 -35.704 82.86 15.71 6.5671 0.00650 -0.00103 0.54993 2.47404 0.00502 0.00005 2000 272.0130132012 8 1.00000 3.142300 8.598916 10.9385680.12258663 3.5328646 3.099782611.0 5.00.15 RATE 1.4842720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.099 0.087 97 7.16 0.097 0 0 2 2 056025.0020120809_648039 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 21, 02:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org