IOTA/IOTA-ES occultation update for (1181) Lilith / TYC 5230-00073-1 event on 2012 Nov 30, 02:16 UT Visible from Brazil, Peru Summary ------- On 2012 Nov 30 UT, the 19 km diameter asteroid (1181) Lilith will occult a 9.3 mag star in the constellation Aquarius for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 15.9 mag (the magnitude of the asteroid) for at most 0.9 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: 28 * date and approx. time of event: 2012 Nov 30, 02:17 - 2012 Nov 30, 02:21 UT * geocentric midpoint of event [JD]: 2456261.59472917 * magnitude of target star: 9.3 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 0.9 * Moon: 98 % sunlit, 113° distance * Sun: 84° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 2.42 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .029", 80° ) * approx speed of asteroid's shadow [km/s]: 20.8202 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5230-00073-1 by 1181 Lilith on 2012 Nov 30 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 -119 0 0 -17 24 35 2 17 11 73 313 -1 -17 30 7 -17 19 3 -17 56 57 -16 52 18 -118 0 0 -17 8 25 2 17 16 72 310 -2 -17 13 57 -17 2 53 -17 40 47 -16 36 7 -117 0 0 -16 52 11 2 17 21 72 307 -3 -16 57 43 -16 46 39 -17 24 34 -16 19 53 -116 0 0 -16 35 54 2 17 27 71 304 -4 -16 41 26 -16 30 22 -17 8 17 -16 3 36 -115 0 0 -16 19 34 2 17 32 70 302 -5 -16 25 7 -16 14 2 -16 51 58 -15 47 16 -114 0 0 -16 3 12 2 17 37 70 300 -6 -16 8 45 -15 57 40 -16 35 36 -15 30 53 -113 0 0 -15 46 48 2 17 43 69 298 -7 -15 52 21 -15 41 16 -16 19 12 -15 14 29 -112 0 0 -15 30 22 2 17 48 68 296 -8 -15 35 55 -15 24 50 -16 2 46 -14 58 3 -111 0 0 -15 13 55 2 17 53 67 294 -9 -15 19 28 -15 8 23 -15 46 19 -14 41 36 -110 0 0 -14 57 27 2 17 58 66 292 -10 -15 2 59 -14 51 54 -15 29 51 -14 25 7 -109 0 0 -14 40 58 2 18 3 66 290 -11 -14 46 31 -14 35 26 -15 13 22 -14 8 39 -108 0 0 -14 24 29 2 18 9 65 289 -12 -14 30 2 -14 18 57 -14 56 53 -13 52 10 -107 0 0 -14 8 0 2 18 14 64 287 -13 -14 13 33 -14 2 28 -14 40 24 -13 35 41 -106 0 0 -13 51 32 2 18 19 63 286 -14 -13 57 4 -13 45 59 -14 23 56 -13 19 13 -105 0 0 -13 35 4 2 18 24 62 285 -15 -13 40 37 -13 29 32 -14 7 28 -13 2 46 -104 0 0 -13 18 38 2 18 29 61 284 -16 -13 24 11 -13 13 6 -13 51 1 -12 46 20 -103 0 0 -13 2 14 2 18 34 60 282 -17 -13 7 46 -12 56 42 -13 34 37 -12 29 56 -102 0 0 -12 45 51 2 18 39 59 281 -18 -12 51 23 -12 40 19 -13 18 14 -12 13 34 -101 0 0 -12 29 31 2 18 44 59 280 -19 -12 35 3 -12 23 59 -13 1 53 -11 57 14 -100 0 0 -12 13 14 2 18 49 58 280 -20 -12 18 46 -12 7 42 -12 45 35 -11 40 57 - 99 0 0 -11 57 0 2 18 53 57 279 -21 -12 2 32 -11 51 28 -12 29 21 -11 24 43 - 98 0 0 -11 40 49 2 18 58 56 278 -22 -11 46 21 -11 35 17 -12 13 9 -11 8 33 - 97 0 0 -11 24 42 2 19 3 55 277 -23 -11 30 14 -11 19 10 -11 57 2 -10 52 27 - 96 0 0 -11 8 39 2 19 7 54 276 -24 -11 14 11 -11 3 8 -11 40 58 -10 36 25 - 95 0 0 -10 52 41 2 19 12 53 276 -25 -10 58 13 -10 47 10 -11 25 0 -10 20 28 - 94 0 0 -10 36 48 2 19 17 52 275 -26 -10 42 20 -10 31 17 -11 9 6 -10 4 35 - 93 0 0 -10 21 0 2 19 21 51 274 -27 -10 26 32 -10 15 29 -10 53 17 - 9 48 48 - 92 0 0 -10 5 18 2 19 25 50 274 -28 -10 10 49 - 9 59 47 -10 37 34 - 9 33 7 - 91 0 0 - 9 49 42 2 19 30 49 273 -29 - 9 55 13 - 9 44 11 -10 21 57 - 9 17 32 - 90 0 0 - 9 34 12 2 19 34 48 273 -30 - 9 39 43 - 9 28 41 -10 6 26 - 9 2 3 - 89 0 0 - 9 18 49 2 19 38 47 272 -31 - 9 24 20 - 9 13 18 - 9 51 2 - 8 46 40 - 88 0 0 - 9 3 33 2 19 42 46 272 -32 - 9 9 3 - 8 58 2 - 9 35 45 - 8 31 25 - 87 0 0 - 8 48 24 2 19 47 45 271 -33 - 8 53 54 - 8 42 54 - 9 20 35 - 8 16 17 - 86 0 0 - 8 33 23 2 19 51 44 271 -34 - 8 38 53 - 8 27 53 - 9 5 33 - 8 1 17 - 85 0 0 - 8 18 30 2 19 55 43 271 -35 - 8 24 0 - 8 13 0 - 8 50 39 - 7 46 25 - 84 0 0 - 8 3 45 2 19 58 42 270 -36 - 8 9 14 - 7 58 15 - 8 35 53 - 7 31 41 - 83 0 0 - 7 49 8 2 20 2 41 270 -37 - 7 54 38 - 7 43 39 - 8 21 15 - 7 17 6 - 82 0 0 - 7 34 41 2 20 6 40 269 -38 - 7 40 11 - 7 29 12 - 8 6 47 - 7 2 40 - 81 0 0 - 7 20 23 2 20 10 39 269 -39 - 7 25 52 - 7 14 54 - 7 52 28 - 6 48 23 - 80 0 0 - 7 6 14 2 20 13 38 269 -40 - 7 11 43 - 7 0 46 - 7 38 18 - 6 34 16 - 79 0 0 - 6 52 16 2 20 17 37 269 -41 - 6 57 44 - 6 46 47 - 7 24 18 - 6 20 18 - 78 0 0 - 6 38 27 2 20 20 36 268 -42 - 6 43 55 - 6 32 58 - 7 10 28 - 6 6 31 - 77 0 0 - 6 24 49 2 20 23 35 268 -43 - 6 30 17 - 6 19 20 - 6 56 48 - 5 52 54 - 76 0 0 - 6 11 21 2 20 26 34 268 -43 - 6 16 49 - 6 5 53 - 6 43 19 - 5 39 27 - 75 0 0 - 5 58 4 2 20 30 33 268 -44 - 6 3 32 - 5 52 36 - 6 30 1 - 5 26 12 - 74 0 0 - 5 44 58 2 20 33 32 267 -45 - 5 50 26 - 5 39 31 - 6 16 54 - 5 13 7 - 73 0 0 - 5 32 4 2 20 36 31 267 -46 - 5 37 32 - 5 26 37 - 6 3 59 - 5 0 14 - 72 0 0 - 5 19 21 2 20 38 30 267 -47 - 5 24 49 - 5 13 54 - 5 51 15 - 4 47 33 - 71 0 0 - 5 6 51 2 20 41 29 267 -48 - 5 12 18 - 5 1 24 - 5 38 43 - 4 35 3 - 70 0 0 - 4 54 32 2 20 44 28 267 -49 - 4 59 59 - 4 49 5 - 5 26 23 - 4 22 46 - 69 0 0 - 4 42 26 2 20 47 27 266 -50 - 4 47 52 - 4 36 59 - 5 14 15 - 4 10 41 - 68 0 0 - 4 30 32 2 20 49 26 266 -51 - 4 35 58 - 4 25 6 - 5 2 20 - 3 58 49 - 67 0 0 - 4 18 51 2 20 51 25 266 -52 - 4 24 17 - 4 13 25 - 4 50 38 - 3 47 9 - 66 0 0 - 4 7 23 2 20 54 24 266 -52 - 4 12 49 - 4 1 57 - 4 39 9 - 3 35 42 - 65 0 0 - 3 56 8 2 20 56 23 266 -53 - 4 1 34 - 3 50 43 - 4 27 52 - 3 24 29 - 64 0 0 - 3 45 7 2 20 58 22 266 -54 - 3 50 32 - 3 39 41 - 4 16 50 - 3 13 29 - 63 0 0 - 3 34 19 2 21 0 21 266 -55 - 3 39 44 - 3 28 54 - 4 6 1 - 3 2 42 - 62 0 0 - 3 23 45 2 21 2 20 266 -56 - 3 29 10 - 3 18 20 - 3 55 25 - 2 52 9 - 61 0 0 - 3 13 25 2 21 4 19 266 -57 - 3 18 50 - 3 8 0 - 3 45 4 - 2 41 50 - 60 0 0 - 3 3 19 2 21 6 18 265 -57 - 3 8 43 - 2 57 54 - 3 34 56 - 2 31 45 - 59 0 0 - 2 53 27 2 21 7 17 265 -58 - 2 58 51 - 2 48 2 - 3 25 3 - 2 21 55 - 58 0 0 - 2 43 49 2 21 9 16 265 -59 - 2 49 13 - 2 38 25 - 3 15 25 - 2 12 19 - 57 0 0 - 2 34 26 2 21 10 15 265 -60 - 2 39 50 - 2 29 3 - 3 6 1 - 2 2 57 - 56 0 0 - 2 25 18 2 21 12 14 265 -60 - 2 30 42 - 2 19 55 - 2 56 51 - 1 53 50 - 55 0 0 - 2 16 25 2 21 13 13 265 -61 - 2 21 48 - 2 11 1 - 2 47 57 - 1 44 58 - 54 0 0 - 2 7 46 2 21 14 12 265 -62 - 2 13 10 - 2 2 23 - 2 39 17 - 1 36 20 - 53 0 0 - 1 59 23 2 21 15 11 265 -62 - 2 4 46 - 1 54 0 - 2 30 53 - 1 27 58 - 52 0 0 - 1 51 15 2 21 16 9 265 -63 - 1 56 38 - 1 45 52 - 2 22 43 - 1 19 51 - 51 0 0 - 1 43 22 2 21 17 8 265 -63 - 1 48 45 - 1 38 0 - 2 14 50 - 1 12 0 - 50 0 0 - 1 35 45 2 21 18 7 265 -64 - 1 41 8 - 1 30 23 - 2 7 11 - 1 4 23 - 49 0 0 - 1 28 23 2 21 19 6 265 -65 - 1 33 46 - 1 23 1 - 1 59 49 - 0 57 3 - 48 0 0 - 1 21 17 2 21 19 5 265 -65 - 1 26 40 - 1 15 55 - 1 52 41 - 0 49 58 - 47 0 0 - 1 14 27 2 21 20 4 265 -66 - 1 19 49 - 1 9 5 - 1 45 50 - 0 43 8 - 46 0 0 - 1 7 52 2 21 20 3 265 -66 - 1 13 14 - 1 2 31 - 1 39 15 - 0 36 35 - 45 0 0 - 1 1 34 2 21 20 2 265 -66 - 1 6 56 - 0 56 12 - 1 32 55 - 0 30 17 - 44 0 0 - 0 55 31 2 21 21 1 265 -67 - 1 0 53 - 0 50 10 - 1 26 52 .. .. .. - 43 0 0 - 0 49 45 2 21 21 0 265 -67 - 0 55 6 - 0 44 23 - 1 21 4 .. .. .. Uncertainty in time = +/- 3 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 5230-00073-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 07 32.8761 DE: -05 17 34.957 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .025 ) * V mag [mag]: 9.3 * B mag [mag]: 10.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1181) Lilith approx. diameter [km]: 19 approx. diameter ["]: .012 distance from Earth [AU]: 2.22100 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 910 number of rejected observations: 38 time covered by the observations: 1930 Dec 18 - 2012 Oct 20 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.015, 67° remarks: * orbital elements for (1181) Lilith : Mean anomaly = 317.80363306 deg Arg. of pericenter = 156.53493733 deg Long. of node = 260.73534494 deg Inclination = 5.60527568 deg Eccentricity = 0.19642121 Semimajor axis = 2.66241945 AU Perihelion dist = 2.13946380 AU Mag: H = 11.15, G = 0.15 Epoch of elements : MJD 56261.09500000 TDT (2012 Nov 30.095) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 30 1181 Lilith 2h 16.4m UT 9.3 22 7 32.876- 5 17 34.96TYC 5230-00073-1 10.9 15.9 19 0.9 2.221 3.023 11.26 -131.5789 -5.296 143.07 -21.68 2.2735 0.06222 -0.24760 11.40227 2.84367 0.00528 0.00206 2000 317.55520320121129.00000156.534937260.735345 5.6052760.19642121 2.6624195 2.139463811.2 5.00.15 RATE 2.2687650 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.029 80 3.42 0.029 0 0 1 3 056247.0020121130_0073-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org