IOTA/IOTA-ES occultation update for (141) Lumen / FK6 5927 event on 2012 Aug 11, 16:48 UT Visible from Japan, China, Russia Summary ------- On 2012 Aug 11 UT, the 145 km diameter asteroid (141) Lumen will occult a 8.1 mag star in the constellation Capricornus for observers along a path across Japan, China, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 10.8 mag (the magnitude of the asteroid) for at most 15.1 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: . The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2012 Aug 11, 16:39 - 2012 Aug 11, 16:56 UT * geocentric midpoint of event [JD]: 2456151.19999167 * magnitude of target star: 8.1 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 15.1 * Moon: 32 % sunlit, 104° distance * Sun: 173° distance * rough path description: Japan, China, Russia The occultation path -------------------- * approximate projected width [km]: 192 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .022", 64° ) * approx speed of asteroid's shadow [km/s]: 9.5969 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of FK6 5927 by 141 Lumen on 2012 Aug 11 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 36 0 0 47 30 46 16 56 21 0 107 -1 .. .. .. 46 36 35 .. .. .. 46 17 16 37 0 0 47 18 22 16 56 21 1 108 -2 48 13 22 46 24 8 48 33 22 46 4 48 38 0 0 47 5 49 16 56 20 2 109 -3 48 0 52 46 11 34 48 20 53 45 52 13 39 0 0 46 53 9 16 56 20 2 109 -3 47 48 13 45 58 51 48 8 15 45 39 30 40 0 0 46 40 21 16 56 19 3 110 -4 47 35 27 45 46 1 47 55 30 45 26 39 41 0 0 46 27 25 16 56 19 4 111 -5 47 22 33 45 33 4 47 42 37 45 13 41 42 0 0 46 14 22 16 56 18 5 111 -5 47 9 33 45 20 0 47 29 36 45 0 36 43 0 0 46 1 13 16 56 17 5 112 -6 46 56 25 45 6 48 47 16 29 44 47 24 44 0 0 45 47 56 16 56 16 6 113 -7 46 43 10 44 53 30 47 3 15 44 34 6 45 0 0 45 34 33 16 56 15 7 114 -8 46 29 48 44 40 6 46 49 54 44 20 41 46 0 0 45 21 4 16 56 13 7 114 -8 46 16 20 44 26 36 46 36 26 44 7 10 47 0 0 45 7 29 16 56 12 8 115 -9 46 2 46 44 12 59 46 22 53 43 53 33 48 0 0 44 53 48 16 56 10 9 116 -10 45 49 6 43 59 17 46 9 13 43 39 51 49 0 0 44 40 1 16 56 8 10 116 -10 45 35 21 43 45 30 45 55 28 43 26 3 50 0 0 44 26 9 16 56 6 10 117 -11 45 21 29 43 31 37 45 41 37 43 12 10 51 0 0 44 12 12 16 56 4 11 118 -12 45 7 33 43 17 39 45 27 41 42 58 12 52 0 0 43 58 11 16 56 2 12 119 -13 44 53 32 43 3 37 45 13 40 42 44 9 53 0 0 43 44 4 16 55 59 13 119 -13 44 39 26 42 49 30 44 59 35 42 30 3 54 0 0 43 29 54 16 55 57 13 120 -14 44 25 16 42 35 19 44 45 25 42 15 52 55 0 0 43 15 39 16 55 54 14 121 -15 44 11 2 42 21 5 44 31 10 42 1 37 56 0 0 43 1 21 16 55 51 15 121 -15 43 56 44 42 6 46 44 16 52 41 47 19 57 0 0 42 47 0 16 55 48 16 122 -16 43 42 22 41 52 25 44 2 31 41 32 57 58 0 0 42 32 35 16 55 45 16 123 -17 43 27 58 41 38 0 43 48 6 41 18 33 59 0 0 42 18 8 16 55 42 17 124 -18 43 13 30 41 23 33 43 33 38 41 4 6 60 0 0 42 3 38 16 55 38 18 124 -18 42 59 0 41 9 4 43 19 8 40 49 36 61 0 0 41 49 5 16 55 34 19 125 -19 42 44 27 40 54 32 43 4 35 40 35 5 62 0 0 41 34 31 16 55 30 19 126 -20 42 29 52 40 39 58 42 50 0 40 20 31 63 0 0 41 19 56 16 55 26 20 127 -20 42 15 16 40 25 23 42 35 23 40 5 57 64 0 0 41 5 19 16 55 22 21 127 -21 42 0 38 40 10 47 42 20 45 39 51 21 65 0 0 40 50 41 16 55 18 22 128 -22 41 45 59 39 56 10 42 6 6 39 36 44 66 0 0 40 36 2 16 55 14 22 129 -23 41 31 19 39 41 32 41 51 26 39 22 7 67 0 0 40 21 23 16 55 9 23 129 -23 41 16 39 39 26 55 41 36 45 39 7 29 68 0 0 40 6 44 16 55 4 24 130 -24 41 1 59 39 12 17 41 22 4 38 52 52 69 0 0 39 52 5 16 54 59 24 131 -25 40 47 18 38 57 39 41 7 23 38 38 15 70 0 0 39 37 27 16 54 54 25 132 -25 40 32 39 38 43 2 40 52 43 38 23 38 71 0 0 39 22 49 16 54 49 26 133 -26 40 17 59 38 28 26 40 38 3 38 9 3 72 0 0 39 8 13 16 54 43 27 133 -27 40 3 22 38 13 52 40 23 25 37 54 29 73 0 0 38 53 38 16 54 38 27 134 -27 39 48 45 37 59 19 40 8 48 37 39 57 74 0 0 38 39 5 16 54 32 28 135 -28 39 34 10 37 44 48 39 54 12 37 25 26 75 0 0 38 24 35 16 54 26 29 136 -29 39 19 38 37 30 19 39 39 39 37 10 58 76 0 0 38 10 6 16 54 20 29 137 -29 39 5 7 37 15 53 39 25 8 36 56 32 77 0 0 37 55 41 16 54 14 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24 29 176 0 0 28 41 50 16 40 34 21 244 -14 29 34 45 27 49 36 29 53 59 27 30 58 177 0 0 28 48 38 16 40 29 20 244 -13 29 41 36 27 56 22 30 0 51 27 37 43 178 0 0 28 55 42 16 40 25 19 245 -12 29 48 42 28 3 23 30 7 58 27 44 44 179 0 0 29 3 1 16 40 21 18 246 -11 29 56 4 28 10 40 30 15 21 27 51 59 180 0 0 29 10 35 16 40 17 17 246 -10 30 3 41 28 18 11 30 22 58 27 59 30 -179 0 0 29 18 24 16 40 13 16 247 -10 30 11 32 28 25 58 30 30 51 28 7 15 -178 0 0 29 26 28 16 40 9 16 247 -9 30 19 39 28 33 59 30 38 59 28 15 15 -177 0 0 29 34 46 16 40 6 15 248 -8 30 28 1 28 42 15 30 47 22 28 23 30 -176 0 0 29 43 20 16 40 2 14 248 -7 30 36 37 28 50 45 30 55 59 28 32 0 -175 0 0 29 52 7 16 39 59 13 249 -6 30 45 28 28 59 30 31 4 51 28 40 44 -174 0 0 30 1 9 16 39 56 12 249 -5 30 54 33 29 8 29 31 13 57 28 49 42 -173 0 0 30 10 26 16 39 54 11 250 -4 31 3 52 29 17 42 31 23 17 28 58 54 -172 0 0 30 19 56 16 39 51 10 250 -4 31 13 25 29 27 10 31 32 52 29 8 20 -171 0 0 30 29 40 16 39 49 10 251 -3 31 23 12 29 36 51 31 42 40 29 18 0 -170 0 0 30 39 37 16 39 47 9 251 -2 31 33 13 29 46 45 31 52 42 29 27 53 -169 0 0 30 49 48 16 39 45 8 252 -1 31 43 27 29 56 53 32 2 58 29 38 0 -168 0 0 31 0 13 16 39 43 7 252 0 31 53 55 30 7 14 32 13 26 29 48 20 Uncertainty in time = +/- 4 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: FK6 5927 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 50 11.4607 DE: -11 20 35.288 * position source: mpos:FK6 LTP pm:FK6 LTP plx:FK6 vrad:FK6 * standard error: RA,DE ["]: ( .018, .016 ) * V mag [mag]: 8.1 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (141) Lumen approx. diameter [km]: 145 approx. diameter ["]: .160 distance from Earth [AU]: 1.25200 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 794 number of rejected observations: 85 time covered by the observations: 1918 Jan 15 - 2012 Jun 27 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.016, 58° remarks: * orbital elements for (141) Lumen : Mean anomaly = 324.02060890 deg Arg. of pericenter = 58.34408452 deg Long. of node = 318.54289742 deg Inclination = 11.88603185 deg Eccentricity = 0.21295653 Semimajor axis = 2.66600899 AU Perihelion dist = 2.09826496 AU Mag: H = 8.35, G = 0.15 Epoch of elements : MJD 56150.70000000 TDT (2012 Aug 11.700) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 11 141 Lumen 16h 48.0m UT 8.1 21 50 11.461-11 20 35.29FK6 5927 0.0 10.8 145 15.1 1.252 -2.564 5.14 114.9974 -11.343 -70.72 15.00 16.7998 0.08805 0.64726 -5.36703 0.73224 -0.00056 -0.00036 2000 323.8621162012 811.00000 58.344085318.542897 11.8860320.21295653 2.6660090 2.0982650 8.2 5.00.15 RATE 2.2641840 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.022 64 1.18 0.029 0 0-3 2 056116.0020120811_6_5927 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 23:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org