IOTA/IOTA-ES occultation update for (367) Amicitia / TYC 1900-01248-1 event on 2008 Apr 03, 01:27 UT Visible from Chile, Argentina Summary ------- On 2008 Apr 03 UT, the 19 km diameter asteroid (367) Amicitia will occult a 10.0 mag star in the constellation Gemini for observers along a path across Chile, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 14.7 mag (the magnitude of the asteroid) for at most 1.1 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: UCAC. The event at a glimpse ---------------------- * Rank: 45 * date and approx. time of event: 2008 Apr 03, 01:27 - 2008 Apr 03, 01:31 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 1.1 * Moon: 12 % sunlit, 133° distance * Sun: 93° distance * rough path description: Chile, Argentina The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 1.43 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .021", 92° ) * approx speed of asteroid's shadow [km/s]: 17.2030 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1900-01248-1 by 367 Amicitia on 2008 Apr 3 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 -112 0 0 -19 56 32 1 27 17 45 8 -1 -20 3 57 -19 49 8 -20 25 16 -19 28 2 -111 0 0 -20 4 7 1 27 23 45 7 -2 -20 11 33 -19 56 42 -20 32 54 -19 35 35 -110 0 0 -20 12 22 1 27 29 45 5 -3 -20 19 49 -20 4 56 -20 41 12 -19 43 47 -109 0 0 -20 21 16 1 27 36 44 4 -4 -20 28 43 -20 13 49 -20 50 8 -19 52 38 -108 0 0 -20 30 49 1 27 42 44 3 -5 -20 38 17 -20 23 21 -20 59 45 -20 2 7 -107 0 0 -20 41 1 1 27 48 44 2 -6 -20 48 30 -20 33 32 -21 10 0 -20 12 16 -106 0 0 -20 51 52 1 27 54 44 0 -7 -20 59 22 -20 44 22 -21 20 55 -20 23 4 -105 0 0 -21 3 21 1 28 1 44 359 -8 -21 10 52 -20 55 51 -21 32 28 -20 34 29 -104 0 0 -21 15 29 1 28 7 44 358 -9 -21 23 2 -21 7 58 -21 44 40 -20 46 34 -103 0 0 -21 28 16 1 28 13 43 356 -10 -21 35 49 -21 20 44 -21 57 31 -20 59 16 -102 0 0 -21 41 41 1 28 19 43 355 -11 -21 49 16 -21 34 8 -22 11 1 -21 12 37 -101 0 0 -21 55 44 1 28 25 43 354 -12 -22 3 20 -21 48 10 -22 25 9 -21 26 36 -100 0 0 -22 10 25 1 28 32 42 353 -12 -22 18 2 -22 2 50 -22 39 55 -21 41 12 - 99 0 0 -22 25 44 1 28 38 42 351 -13 -22 33 22 -22 18 7 -22 55 18 -21 56 26 - 98 0 0 -22 41 40 1 28 44 42 350 -14 -22 49 20 -22 34 2 -23 11 20 -22 12 17 - 97 0 0 -22 58 14 1 28 50 41 349 -15 -23 5 54 -22 50 34 -23 27 58 -22 28 45 - 96 0 0 -23 15 24 1 28 56 41 348 -16 -23 23 6 -23 7 43 -23 45 14 -22 45 50 - 95 0 0 -23 33 10 1 29 2 40 347 -17 -23 40 54 -23 25 28 -24 3 7 -23 3 31 - 94 0 0 -23 51 33 1 29 7 40 346 -18 -23 59 19 -23 43 49 -24 21 36 -23 21 48 - 93 0 0 -24 10 32 1 29 13 39 345 -19 -24 18 19 -24 2 47 -24 40 41 -23 40 41 - 92 0 0 -24 30 7 1 29 19 39 344 -20 -24 37 56 -24 22 20 -25 0 22 -24 0 9 - 91 0 0 -24 50 17 1 29 25 38 343 -21 -24 58 7 -24 42 28 -25 20 38 -24 20 13 - 90 0 0 -25 11 1 1 29 30 37 341 -22 -25 18 53 -25 3 11 -25 41 29 -24 40 51 - 89 0 0 -25 32 20 1 29 36 37 340 -23 -25 40 14 -25 24 28 -26 2 55 -25 2 3 - 88 0 0 -25 54 13 1 29 41 36 339 -24 -26 2 8 -25 46 19 -26 24 55 -25 23 49 - 87 0 0 -26 16 39 1 29 46 35 339 -24 -26 24 36 -26 8 43 -26 47 28 -25 46 8 - 86 0 0 -26 39 38 1 29 52 35 338 -25 -26 47 37 -26 31 40 -27 10 35 -26 9 0 - 85 0 0 -27 3 10 1 29 57 34 337 -26 -27 11 11 -26 55 10 -27 34 13 -26 32 24 - 84 0 0 -27 27 13 1 30 2 33 336 -27 -27 35 16 -27 19 11 -27 58 24 -26 56 20 - 83 0 0 -27 51 47 1 30 7 32 335 -28 -27 59 52 -27 43 44 -28 23 7 -27 20 47 - 82 0 0 -28 16 52 1 30 12 32 334 -29 -28 24 59 -28 8 47 -28 48 19 -27 45 45 - 81 0 0 -28 42 27 1 30 16 31 333 -29 -28 50 36 -28 34 20 -29 14 2 -28 11 12 - 80 0 0 -29 8 32 1 30 21 30 332 -30 -29 16 43 -29 0 22 -29 40 15 -28 37 8 - 79 0 0 -29 35 4 1 30 26 29 331 -31 -29 43 18 -29 26 53 -30 6 56 -29 3 33 - 78 0 0 -30 2 5 1 30 30 29 331 -32 -30 10 20 -29 53 51 -30 34 4 -29 30 25 - 77 0 0 -30 29 32 1 30 34 28 330 -33 -30 37 50 -30 21 16 -31 1 40 -29 57 45 - 76 0 0 -30 57 26 1 30 39 27 329 -33 -31 5 46 -30 49 8 -31 29 43 -30 25 30 - 75 0 0 -31 25 45 1 30 43 26 328 -34 -31 34 7 -31 17 25 -31 58 10 -30 53 41 - 74 0 0 -31 54 29 1 30 47 25 327 -35 -32 2 53 -31 46 6 -32 27 2 -31 22 17 - 73 0 0 -32 23 36 1 30 50 24 327 -35 -32 32 2 -32 15 11 -32 56 18 -31 51 16 - 72 0 0 -32 53 6 1 30 54 23 326 -36 -33 1 34 -32 44 39 -33 25 57 -32 20 37 - 71 0 0 -33 22 58 1 30 58 22 325 -37 -33 31 28 -33 14 28 -33 55 57 -32 50 20 - 70 0 0 -33 53 10 1 31 1 22 325 -37 -34 1 43 -33 44 39 -34 26 18 -33 20 24 - 69 0 0 -34 23 42 1 31 4 21 324 -38 -34 32 17 -34 15 8 -34 56 59 -33 50 48 - 68 0 0 -34 54 33 1 31 7 20 323 -38 -35 3 10 -34 45 57 -35 27 58 -34 21 30 - 67 0 0 -35 25 41 1 31 10 19 322 -39 -35 34 20 -35 17 3 -35 59 15 -34 52 30 - 66 0 0 -35 57 6 1 31 13 18 322 -39 -36 5 47 -35 48 25 -36 30 48 -35 23 46 - 65 0 0 -36 28 46 1 31 16 17 321 -40 -36 37 29 -36 20 3 -37 2 37 -35 55 18 - 64 0 0 -37 0 40 1 31 18 16 320 -40 -37 9 26 -36 51 55 -37 34 40 -36 27 4 - 63 0 0 -37 32 47 1 31 21 15 320 -41 -37 41 35 -37 24 1 -38 6 55 -36 59 3 - 62 0 0 -38 5 6 1 31 23 14 319 -41 -38 13 57 -37 56 18 -38 39 23 -37 31 14 - 61 0 0 -38 37 36 1 31 25 13 318 -42 -38 46 29 -38 28 45 -39 12 1 -38 3 36 - 60 0 0 -39 10 15 1 31 27 12 318 -42 -39 19 10 -39 1 22 -39 44 48 -38 36 8 - 59 0 0 -39 43 3 1 31 29 11 317 -42 -39 51 59 -39 34 8 -40 17 43 -39 8 47 - 58 0 0 -40 15 57 1 31 30 11 316 -43 -40 24 55 -40 7 0 -40 50 45 -39 41 34 - 57 0 0 -40 48 57 1 31 32 10 316 -43 -40 57 57 -40 39 58 -41 23 53 -40 14 27 - 56 0 0 -41 22 1 1 31 33 9 315 -43 -41 31 3 -41 13 0 -41 57 5 -40 47 24 - 55 0 0 -41 55 8 1 31 35 8 314 -43 -42 4 13 -41 46 6 -42 30 19 -41 20 24 - 54 0 0 -42 28 18 1 31 36 7 313 -43 -42 37 24 -42 19 13 -43 3 35 -41 53 27 - 53 0 0 -43 1 27 1 31 37 6 313 -44 -43 10 35 -42 52 21 -43 36 52 -42 26 30 - 52 0 0 -43 34 36 1 31 37 5 312 -44 -43 43 46 -43 25 29 -44 10 7 -42 59 33 - 51 0 0 -44 7 43 1 31 38 4 311 -44 -44 16 54 -43 58 34 -44 43 21 -43 32 34 - 50 0 0 -44 40 47 1 31 38 3 311 -44 -44 49 59 -44 31 36 -45 16 30 -44 5 32 - 49 0 0 -45 13 46 1 31 39 2 310 -44 -45 23 0 -45 4 34 -45 49 35 -44 38 25 - 48 0 0 -45 46 39 1 31 39 1 309 -44 -45 55 55 -45 37 26 -46 22 34 .. .. .. - 47 0 0 -46 19 26 1 31 39 1 309 -44 -46 28 42 -46 10 11 -46 55 25 .. .. .. Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 1900-01248-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 11 14.5582 DE: +25 12 41.670 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .014, .015 ) * V mag [mag]: 10.0 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (367) Amicitia approx. diameter [km]: 19 approx. diameter ["]: .015 distance from Earth [AU]: 1.69600 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 851 number of rejected observations: 79 time covered by the observations: 1906 Mar 28 - 2008 Mar 18 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.015, 93° remarks: * orbital elements for (367) Amicitia : Mean anomaly = 358.01933061 deg Arg. of pericenter = 54.87853319 deg Long. of node = 83.53835745 deg Inclination = 2.94316045 deg Eccentricity = 0.09585620 Semimajor axis = 2.21942140 AU Perihelion dist = 2.00667609 AU Mag: H = 10.49, G = 0.15 Epoch of elements : MJD 54559.06100000 TDT (2008 Apr 03.061) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 3 367 Amicitia 1h 27.3m UT 10.0 7 11 14.558 25 12 41.67TYC 1900-01248-1 10.0 14.7 19 1.1 1.696 3.676 -6.76 -105.7763 25.212 159.00 5.40 1.4554 -0.09691 -0.70559 9.62199 -1.30333 0.00526 -0.00066 2000 355.3183562008 325.00000 54.878533 83.538357 2.9431600.09585620 2.2194214 2.006676110.7 5.00.15 RATE 2.9808800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.021 92 2.43 0.022 0 54553.5020080403_1248-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org