IOTA/IOTA-ES occultation update for (1213) Algeria / HIP 73832 event on 2012 Aug 26, 01:24 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2012 Aug 26 UT, the 35 km diameter asteroid (1213) Algeria will occult a 9.8 mag star in the constellation Libra for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.2 mag to 17.0 mag (the magnitude of the asteroid) for at most 1.6 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: 30 * date and approx. time of event: 2012 Aug 26, 01:26 - 2012 Aug 26, 01:29 UT * geocentric midpoint of event [JD]: 2456165.5590375 * magnitude of target star: 9.8 * magnitude drop [mag]: 7.2 * estimated maximum duration [s]: 1.6 * Moon: 67 % sunlit, 33° distance * Sun: 77° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 2.20 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .031", 93° ) * approx speed of asteroid's shadow [km/s]: 21.6865 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 73832 by 1213 Algeria on 2012 Aug 26 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 -115 0 0 -23 55 46 1 26 9 76 270 -1 -24 5 16 -23 46 15 -24 47 8 -23 4 24 -114 0 0 -23 51 18 1 26 14 75 270 -2 -24 0 49 -23 41 47 -24 42 42 -22 59 55 -113 0 0 -23 46 27 1 26 18 74 269 -2 -23 55 59 -23 36 56 -24 37 53 -22 55 2 -112 0 0 -23 41 13 1 26 23 74 268 -3 -23 50 45 -23 31 41 -24 32 41 -22 49 46 -111 0 0 -23 35 36 1 26 28 73 268 -4 -23 45 8 -23 26 3 -24 27 5 -22 44 6 -110 0 0 -23 29 35 1 26 32 72 267 -5 -23 39 7 -23 20 2 -24 21 7 -22 38 3 -109 0 0 -23 23 10 1 26 37 71 266 -6 -23 32 43 -23 13 37 -24 14 45 -22 31 36 -108 0 0 -23 16 23 1 26 41 70 266 -7 -23 25 56 -23 6 49 -24 8 0 -22 24 46 -107 0 0 -23 9 12 1 26 46 69 265 -8 -23 18 46 -22 59 38 -24 0 52 -22 17 32 -106 0 0 -23 1 37 1 26 50 68 265 -9 -23 11 12 -22 52 3 -23 53 21 -22 9 55 -105 0 0 -22 53 40 1 26 55 67 264 -10 -23 3 15 -22 44 5 -23 45 26 -22 1 55 -104 0 0 -22 45 19 1 26 59 66 264 -11 -22 54 55 -22 35 44 -23 37 9 -21 53 31 -103 0 0 -22 36 35 1 27 4 65 263 -12 -22 46 12 -22 26 59 -23 28 28 -21 44 44 -102 0 0 -22 27 29 1 27 8 64 263 -12 -22 37 5 -22 17 52 -23 19 24 -21 35 33 -101 0 0 -22 17 58 1 27 13 63 262 -13 -22 27 36 -22 8 21 -23 9 58 -21 26 0 -100 0 0 -22 8 5 1 27 17 62 262 -14 -22 17 44 -21 58 27 -23 0 8 -21 16 3 - 99 0 0 -21 57 49 1 27 21 61 262 -15 -22 7 28 -21 48 10 -22 49 56 -21 5 43 - 98 0 0 -21 47 10 1 27 26 60 261 -16 -21 56 50 -21 37 31 -22 39 21 -20 55 0 - 97 0 0 -21 36 8 1 27 30 59 261 -17 -21 45 49 -21 26 28 -22 28 23 -20 43 55 - 96 0 0 -21 24 44 1 27 34 58 260 -18 -21 34 25 -21 15 3 -22 17 3 -20 32 26 - 95 0 0 -21 12 56 1 27 38 57 260 -19 -21 22 38 -21 3 15 -22 5 19 -20 20 34 - 94 0 0 -21 0 46 1 27 43 56 259 -20 -21 10 29 -20 51 4 -21 53 14 -20 8 20 - 93 0 0 -20 48 14 1 27 47 56 259 -21 -20 57 57 -20 38 30 -21 40 45 -19 55 43 - 92 0 0 -20 35 19 1 27 51 55 259 -22 -20 45 3 -20 25 35 -21 27 55 -19 42 44 - 91 0 0 -20 22 2 1 27 55 54 258 -23 -20 31 47 -20 12 17 -21 14 42 -19 29 22 - 90 0 0 -20 8 22 1 27 59 53 258 -24 -20 18 8 -19 58 36 -21 1 7 -19 15 38 - 89 0 0 -19 54 20 1 28 3 52 258 -25 -20 4 7 -19 44 34 -20 47 10 -19 1 32 - 88 0 0 -19 39 57 1 28 7 51 257 -26 -19 49 45 -19 30 9 -20 32 51 -18 47 4 - 87 0 0 -19 25 11 1 28 11 50 257 -26 -19 35 0 -19 15 23 -20 18 10 -18 32 13 - 86 0 0 -19 10 4 1 28 15 49 256 -27 -19 19 54 -19 0 15 -20 3 8 -18 17 1 - 85 0 0 -18 54 35 1 28 18 48 256 -28 -19 4 26 -18 44 45 -19 47 44 -18 1 28 - 84 0 0 -18 38 45 1 28 22 47 256 -29 -18 48 37 -18 28 54 -19 31 59 -17 45 33 - 83 0 0 -18 22 34 1 28 26 46 255 -30 -18 32 26 -18 12 42 -19 15 52 -17 29 17 - 82 0 0 -18 6 2 1 28 30 45 255 -31 -18 15 55 -17 56 9 -18 59 25 -17 12 40 - 81 0 0 -17 49 8 1 28 33 44 255 -32 -17 59 2 -17 39 15 -18 42 36 -16 55 41 - 80 0 0 -17 31 55 1 28 37 43 254 -33 -17 41 50 -17 22 0 -18 25 28 -16 38 23 - 79 0 0 -17 14 21 1 28 40 42 254 -34 -17 24 16 -17 4 25 -18 7 58 -16 20 44 - 78 0 0 -16 56 26 1 28 44 41 254 -35 -17 6 23 -16 46 30 -17 50 9 -16 2 45 - 77 0 0 -16 38 12 1 28 47 40 253 -36 -16 48 10 -16 28 14 -17 32 0 -15 44 25 - 76 0 0 -16 19 38 1 28 50 39 253 -37 -16 29 37 -16 9 40 -17 13 31 -15 25 47 - 75 0 0 -16 0 45 1 28 54 38 253 -38 -16 10 44 -15 50 45 -16 54 42 -15 6 48 - 74 0 0 -15 41 32 1 28 57 37 253 -39 -15 51 33 -15 31 32 -16 35 35 -14 47 31 - 73 0 0 -15 22 1 1 29 0 36 252 -40 -15 32 2 -15 12 0 -16 16 8 -14 27 55 - 72 0 0 -15 2 12 1 29 3 34 252 -41 -15 12 14 -14 52 9 -15 56 23 -14 8 1 - 71 0 0 -14 42 4 1 29 6 33 252 -42 -14 52 7 -14 32 1 -15 36 20 -13 47 48 - 70 0 0 -14 21 38 1 29 9 32 252 -43 -14 31 42 -14 11 34 -15 15 59 -13 27 18 - 69 0 0 -14 0 55 1 29 12 31 251 -44 -14 10 59 -13 50 50 -14 55 21 -13 6 30 - 68 0 0 -13 39 54 1 29 14 30 251 -45 -13 50 0 -13 29 49 -14 34 25 -12 45 25 - 67 0 0 -13 18 37 1 29 17 29 251 -46 -13 28 44 -13 8 31 -14 13 12 -12 24 4 - 66 0 0 -12 57 4 1 29 20 28 251 -47 -13 7 11 -12 46 57 -13 51 43 -12 2 26 - 65 0 0 -12 35 15 1 29 22 27 250 -48 -12 45 23 -12 25 7 -13 29 58 -11 40 32 - 64 0 0 -12 13 10 1 29 24 26 250 -49 -12 23 18 -12 3 1 -13 7 57 -11 18 23 - 63 0 0 -11 50 50 1 29 27 25 250 -50 -12 0 59 -11 40 40 -12 45 42 -10 55 59 - 62 0 0 -11 28 15 1 29 29 24 250 -51 -11 38 25 -11 18 5 -12 23 11 -10 33 20 - 61 0 0 -11 5 26 1 29 31 23 249 -52 -11 15 37 -10 55 15 -12 0 26 -10 10 28 - 60 0 0 -10 42 24 1 29 33 22 249 -53 -10 52 35 -10 32 12 -11 37 27 - 9 47 22 - 59 0 0 -10 19 8 1 29 35 21 249 -54 -10 29 20 -10 8 56 -11 14 15 - 9 24 2 - 58 0 0 - 9 55 39 1 29 37 20 249 -55 -10 5 52 - 9 45 27 -10 50 50 - 9 0 30 - 57 0 0 - 9 31 59 1 29 39 19 249 -55 - 9 42 12 - 9 21 45 -10 27 13 - 8 36 46 - 56 0 0 - 9 8 6 1 29 41 18 249 -56 - 9 18 20 - 8 57 52 -10 3 23 - 8 12 51 - 55 0 0 - 8 44 3 1 29 42 17 248 -57 - 8 54 17 - 8 33 48 - 9 39 23 - 7 48 44 - 54 0 0 - 8 19 49 1 29 44 15 248 -58 - 8 30 4 - 8 9 33 - 9 15 12 - 7 24 27 - 53 0 0 - 7 55 24 1 29 45 14 248 -59 - 8 5 40 - 7 45 9 - 8 50 50 - 7 0 0 - 52 0 0 - 7 30 51 1 29 47 13 248 -60 - 7 41 7 - 7 20 34 - 8 26 19 - 6 35 24 - 51 0 0 - 7 6 8 1 29 48 12 248 -61 - 7 16 25 - 6 55 51 - 8 1 39 - 6 10 39 - 50 0 0 - 6 41 17 1 29 49 11 248 -62 - 6 51 34 - 6 31 0 - 7 36 50 - 5 45 45 - 49 0 0 - 6 16 19 1 29 50 10 248 -63 - 6 26 36 - 6 6 1 - 7 11 54 - 5 20 45 - 48 0 0 - 5 51 13 1 29 51 9 248 -64 - 6 1 31 - 5 40 55 - 6 46 50 - 4 55 37 - 47 0 0 - 5 26 0 1 29 52 8 247 -65 - 5 36 19 - 5 15 42 - 6 21 39 - 4 30 23 - 46 0 0 - 5 0 42 1 29 52 7 247 -66 - 5 11 1 - 4 50 24 - 5 56 23 - 4 5 3 - 45 0 0 - 4 35 19 1 29 53 6 247 -67 - 4 45 38 - 4 25 0 - 5 31 1 - 3 39 39 - 44 0 0 - 4 9 51 1 29 54 5 247 -67 - 4 20 10 - 3 59 32 - 5 5 34 - 3 14 9 - 43 0 0 - 3 44 19 1 29 54 4 247 -68 - 3 54 38 - 3 34 0 - 4 40 3 - 2 48 36 - 42 0 0 - 3 18 43 1 29 54 3 247 -69 - 3 29 3 - 3 8 24 - 4 14 28 - 2 23 0 - 41 0 0 - 2 53 5 1 29 54 1 247 -70 - 3 3 24 - 2 42 46 - 3 48 51 - 1 57 21 - 40 0 0 - 2 27 25 1 29 55 0 247 -70 - 2 37 44 - 2 17 5 - 3 23 11 .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: HIP 73832 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 05 20.9404 DE: -22 59 25.107 * position source: mpos:UCAC2 pm:UCAC2 plx:HIP2 * standard error: RA,DE ["]: ( .026, .026 ) * V mag [mag]: 9.8 * B mag [mag]: 10.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1213) Algeria approx. diameter [km]: 35 approx. diameter ["]: .014 distance from Earth [AU]: 3.45100 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 815 number of rejected observations: 22 time covered by the observations: 1931 Nov 16 - 2012 May 10 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.017, 95° remarks: * orbital elements for (1213) Algeria : Mean anomaly = 239.49515825 deg Arg. of pericenter = 107.16774538 deg Long. of node = 271.77282445 deg Inclination = 13.07863150 deg Eccentricity = 0.12819348 Semimajor axis = 3.13824338 AU Perihelion dist = 2.73594105 AU Mag: H = 11.00, G = 0.15 Epoch of elements : MJD 56165.05900000 TDT (2012 Aug 26.059) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 26 1213 Algeria 1h 25.0m UT 9.8 15 5 20.940-22 59 25.11HIP 73832 10.5 17.0 35 1.6 3.451 2.258 -0.77 -129.6234 -22.990 159.20 10.32 1.4169 0.00053 -0.01907 12.23672 -0.30187 0.00533 -0.00166 2000 238.5982692012 821.00000107.167745271.772824 13.0786320.12819348 3.1382434 2.735941010.8 5.00.15 RATE 1.7728590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.031 93 3.20 0.031 0 0 4 3 056116.0020120826__73832 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 23:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org