IOTA/IOTA-ES occultation update for (792) Metcalfia / TYC 1788-01093-1 event on 2007 Aug 02, 05:03 UT Visible from Africa in twilight Summary ------- On 2007 Aug 02 UT, the 61 km diameter asteroid (792) Metcalfia will occult a 10.7 mag star in the constellation Aries for observers along a path across Africa in twilight. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.6 mag (the magnitude of the asteroid) for at most 2.5 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: 80 * date and approx. time of event: 2007 Aug 02, 05:00 - 2007 Aug 02, 05:06 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 2.5 * Moon: 87 % sunlit, 61° distance * Sun: 77° distance * rough path description: Africa in twilight The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 0.67 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .021", 87° ) * approx speed of asteroid's shadow [km/s]: 23.9712 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1788-01093-1 by 792 Metcalfia on 2007 Aug 02 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 - 24 36 22 -55 0 0 5 0 43 0 42 -38 - 23 40 16 ... .. .. - 22 24 56 ... .. .. - 23 3 24 -54 0 0 5 0 43 2 41 -37 - 22 8 31 - 23 58 12 - 20 54 46 ... .. .. - 21 32 4 -53 0 0 5 0 44 3 39 -37 - 20 38 16 - 22 25 45 - 19 25 59 ... .. .. - 20 2 8 -52 0 0 5 0 44 4 38 -36 - 19 9 20 - 20 54 48 - 17 58 21 ... .. .. - 18 33 22 -51 0 0 5 0 45 6 37 -36 - 17 41 29 - 19 25 7 - 16 31 41 - 20 34 14 - 17 5 36 -50 0 0 5 0 46 7 36 -35 - 16 14 32 - 17 56 31 - 15 5 49 - 19 4 30 - 15 38 39 -49 0 0 5 0 47 8 35 -34 - 14 48 19 - 16 28 49 - 13 40 34 - 17 35 46 - 14 12 20 -48 0 0 5 0 49 10 34 -33 - 13 22 40 - 15 1 49 - 12 15 46 - 16 7 51 - 12 46 30 -47 0 0 5 0 50 11 32 -33 - 11 57 25 - 13 35 23 - 10 51 17 - 14 40 35 - 11 21 0 -46 0 0 5 0 52 13 31 -32 - 10 32 25 - 12 9 21 - 9 26 57 - 13 13 49 - 9 55 40 -45 0 0 5 0 55 14 30 -31 - 9 7 32 - 10 43 34 - 8 2 38 - 11 47 23 - 8 30 22 -44 0 0 5 0 57 15 29 -30 - 7 42 37 - 9 17 52 - 6 38 12 - 10 21 8 - 7 4 58 -43 0 0 5 1 0 17 28 -29 - 6 17 31 - 7 52 8 - 5 13 30 - 8 54 56 - 5 39 18 -42 0 0 5 1 3 18 27 -28 - 4 52 6 - 6 26 12 - 3 48 23 - 7 28 38 - 4 13 14 -41 0 0 5 1 6 19 26 -27 - 3 26 13 - 4 59 56 - 2 22 42 - 6 2 5 - 2 46 37 -40 0 0 5 1 9 21 25 -26 - 1 59 42 - 3 33 11 - 0 56 19 - 4 35 8 - 1 19 18 -39 0 0 5 1 13 22 23 -25 - 0 32 26 - 2 5 49 0 30 56 - 3 7 38 0 8 53 -38 0 0 5 1 17 24 22 -23 0 55 47 - 0 37 38 1 59 13 - 1 39 26 1 38 5 -37 0 0 5 1 21 25 21 -22 2 25 5 0 51 29 3 28 43 - 0 10 23 3 8 30 -36 0 0 5 1 26 26 20 -21 3 55 41 2 21 44 4 59 36 1 19 42 4 40 19 -35 0 0 5 1 31 28 18 -19 5 27 47 3 53 19 6 32 7 2 51 0 6 13 45 -34 0 0 5 1 36 29 17 -18 7 1 35 5 26 25 8 6 28 4 23 43 7 49 2 -33 0 0 5 1 42 30 15 -16 8 37 20 7 1 16 9 42 55 5 58 3 9 26 26 -32 0 0 5 1 48 32 14 -15 10 15 19 8 38 8 11 21 45 7 34 15 11 6 14 -31 0 0 5 1 54 33 12 -13 11 55 50 10 17 16 13 3 20 9 12 34 12 48 48 -30 0 0 5 2 1 34 11 -12 13 39 16 11 59 1 14 48 2 10 53 20 14 34 31 -29 0 0 5 2 8 35 9 -10 15 26 1 13 43 46 16 36 19 12 36 53 16 23 51 -28 0 0 5 2 16 37 7 -8 17 16 37 15 31 56 18 28 45 14 23 37 18 17 22 -27 0 0 5 2 24 38 5 -6 19 11 39 17 24 3 20 26 1 16 14 1 20 15 46 -26 0 0 5 2 32 39 2 -4 21 11 53 19 20 46 22 28 58 18 8 40 22 19 56 -25 0 0 5 2 42 40 360 -2 23 18 17 21 22 52 24 38 41 20 8 15 Latitude Latitude Latitude Latitude 23 0 0 -24 41 17 5 2 45 40 359 -1 -25 8 29 -24 14 21 -25 45 20 -23 38 38 24 0 0 -24 13 52 5 2 49 41 358 0 -24 40 54 -23 47 5 -25 17 32 -23 11 34 25 0 0 -23 47 11 5 2 54 41 357 1 -24 14 3 -23 20 32 -24 50 28 -22 45 13 26 0 0 -23 21 13 5 2 58 41 355 2 -23 47 57 -22 54 44 -24 24 9 -22 19 36 27 0 0 -22 56 0 5 3 3 42 354 3 -23 22 35 -22 29 39 -23 58 36 -21 54 42 28 0 0 -22 31 32 5 3 8 42 353 4 -22 57 58 -22 5 19 -23 33 47 -21 30 33 29 0 0 -22 7 49 5 3 12 42 352 5 -22 34 7 -21 41 44 -23 9 45 -21 7 8 30 0 0 -21 44 51 5 3 17 43 350 6 -22 11 1 -21 18 54 -22 46 28 -20 44 28 31 0 0 -21 22 39 5 3 22 43 349 7 -21 48 41 -20 56 49 -22 23 57 -20 22 33 32 0 0 -21 1 12 5 3 26 43 348 8 -21 27 8 -20 35 30 -22 2 13 -20 1 23 33 0 0 -20 40 32 5 3 31 43 346 9 -21 6 20 -20 14 56 -21 41 16 -19 40 58 34 0 0 -20 20 37 5 3 36 43 345 10 -20 46 19 -19 55 9 -21 21 5 -19 21 20 35 0 0 -20 1 29 5 3 40 43 344 11 -20 27 4 -19 36 7 -21 1 42 -19 2 26 36 0 0 -19 43 8 5 3 45 43 343 12 -20 8 37 -19 17 52 -20 43 5 -18 44 19 37 0 0 -19 25 33 5 3 50 43 341 13 -19 50 56 -19 0 23 -20 25 16 -18 26 57 38 0 0 -19 8 45 5 3 54 43 340 14 -19 34 1 -18 43 40 -20 8 14 -18 10 22 39 0 0 -18 52 43 5 3 59 43 339 15 -19 17 54 -18 27 44 -19 51 59 -17 54 33 40 0 0 -18 37 28 5 4 4 43 337 16 -19 2 34 -18 12 34 -19 36 32 -17 39 30 41 0 0 -18 23 0 5 4 8 43 336 17 -18 48 1 -17 58 11 -19 21 52 -17 25 13 42 0 0 -18 9 19 5 4 13 43 335 18 -18 34 16 -17 44 34 -19 8 0 -17 11 42 43 0 0 -17 56 25 5 4 17 42 334 19 -18 21 17 -17 31 44 -18 54 56 -16 58 58 44 0 0 -17 44 18 5 4 22 42 333 20 -18 9 6 -17 19 41 -18 42 39 -16 47 0 45 0 0 -17 32 58 5 4 26 42 331 21 -17 57 42 -17 8 25 -18 31 9 -16 35 49 46 0 0 -17 22 24 5 4 31 41 330 22 -17 47 5 -16 57 55 -18 20 27 -16 25 24 47 0 0 -17 12 38 5 4 35 41 329 23 -17 37 15 -16 48 12 -18 10 33 -16 15 45 48 0 0 -17 3 39 5 4 40 41 328 24 -17 28 13 -16 39 16 -18 1 26 -16 6 53 49 0 0 -16 55 26 5 4 44 40 327 25 -17 19 57 -16 31 6 -17 53 7 -15 58 47 50 0 0 -16 48 1 5 4 48 40 326 25 -17 12 29 -16 23 43 -17 45 35 -15 51 27 51 0 0 -16 41 22 5 4 52 39 325 26 -17 5 48 -16 17 7 -17 38 51 -15 44 54 52 0 0 -16 35 30 5 4 57 39 324 27 -16 59 55 -16 11 17 -17 32 55 -15 39 7 53 0 0 -16 30 26 5 5 1 38 323 28 -16 54 48 -16 6 14 -17 27 45 -15 34 6 54 0 0 -16 26 8 5 5 5 38 322 29 -16 50 28 -16 1 58 -17 23 24 -15 29 51 55 0 0 -16 22 36 5 5 9 37 321 30 -16 46 56 -15 58 28 -17 19 49 -15 26 23 56 0 0 -16 19 52 5 5 13 37 320 31 -16 44 10 -15 55 44 -17 17 3 -15 23 41 57 0 0 -16 17 54 5 5 17 36 320 32 -16 42 12 -15 53 47 -17 15 3 -15 21 45 58 0 0 -16 16 43 5 5 21 36 319 32 -16 41 0 -15 52 37 -17 13 51 -15 20 35 59 0 0 -16 16 19 5 5 25 35 318 33 -16 40 36 -15 52 13 -17 13 26 -15 20 12 60 0 0 -16 16 41 5 5 28 34 317 34 -16 40 58 -15 52 35 -17 13 48 -15 20 34 61 0 0 -16 17 50 5 5 32 34 316 35 -16 42 7 -15 53 44 -17 14 58 -15 21 42 62 0 0 -16 19 46 5 5 36 33 316 35 -16 44 3 -15 55 39 -17 16 54 -15 23 37 63 0 0 -16 22 28 5 5 39 32 315 36 -16 46 46 -15 58 20 -17 19 38 -15 26 17 64 0 0 -16 25 56 5 5 43 31 314 37 -16 50 16 -16 1 48 -17 23 9 -15 29 43 65 0 0 -16 30 11 5 5 46 31 314 38 -16 54 32 -16 6 1 -17 27 27 -15 33 55 66 0 0 -16 35 12 5 5 49 30 313 38 -16 59 35 -16 11 1 -17 32 31 -15 38 53 67 0 0 -16 41 0 5 5 53 29 312 39 -17 5 24 -16 16 47 -17 38 23 -15 44 37 68 0 0 -16 47 34 5 5 56 28 312 40 -17 12 0 -16 23 19 -17 45 2 -15 51 7 69 0 0 -16 54 54 5 5 59 28 311 40 -17 19 22 -16 30 37 -17 52 28 -15 58 22 70 0 0 -17 3 1 5 6 2 27 311 41 -17 27 31 -16 38 41 -18 0 40 -16 6 23 71 0 0 -17 11 53 5 6 5 26 310 42 -17 36 27 -16 47 31 -18 9 39 -16 15 9 72 0 0 -17 21 32 5 6 8 25 310 42 -17 46 9 -16 57 7 -18 19 25 -16 24 41 73 0 0 -17 31 57 5 6 11 24 309 43 -17 56 37 -17 7 29 -18 29 58 -16 34 59 74 0 0 -17 43 8 5 6 13 23 308 43 -18 7 51 -17 18 36 -18 41 17 -16 46 1 75 0 0 -17 55 4 5 6 16 22 308 44 -18 19 51 -17 30 29 -18 53 22 -16 57 49 76 0 0 -18 7 47 5 6 18 22 308 44 -18 32 38 -17 43 7 -19 6 14 -17 10 23 77 0 0 -18 21 15 5 6 21 21 307 45 -18 46 10 -17 56 31 -19 19 53 -17 23 41 78 0 0 -18 35 29 5 6 23 20 307 45 -19 0 28 -18 10 41 -19 34 17 -17 37 45 79 0 0 -18 50 28 5 6 25 19 306 45 -19 15 33 -18 25 35 -19 49 28 -17 52 33 80 0 0 -19 6 13 5 6 27 18 306 46 -19 31 22 -18 41 15 -20 5 25 -18 8 7 81 0 0 -19 22 43 5 6 29 17 305 46 -19 47 58 -18 57 40 -20 22 7 -18 24 25 82 0 0 -19 39 58 5 6 31 16 305 46 -20 5 18 -19 14 50 -20 39 36 -18 41 28 83 0 0 -19 57 58 5 6 33 15 304 47 -20 23 24 -19 32 44 -20 57 50 -18 59 15 84 0 0 -20 16 43 5 6 35 14 304 47 -20 42 16 -19 51 23 -21 16 49 -19 17 46 85 0 0 -20 36 13 5 6 36 13 304 47 -21 1 52 -20 10 47 -21 36 34 -19 37 1 86 0 0 -20 56 27 5 6 38 12 303 47 -21 22 12 -20 30 55 -21 57 4 -19 57 1 87 0 0 -21 17 25 5 6 39 11 303 47 -21 43 18 -20 51 46 -22 18 19 -20 17 44 88 0 0 -21 39 8 5 6 40 10 302 47 -22 5 7 -21 13 22 -22 40 18 -20 39 10 89 0 0 -22 1 34 5 6 42 9 302 47 -22 27 41 -21 35 41 -23 3 2 -21 1 20 90 0 0 -22 24 44 5 6 43 8 302 47 -22 50 58 -21 58 43 -23 26 30 -21 24 12 91 0 0 -22 48 37 5 6 44 7 301 47 -23 14 59 -22 22 28 -23 50 41 -21 47 48 92 0 0 -23 13 12 5 6 44 6 301 47 -23 39 43 -22 46 56 -24 15 37 -22 12 5 93 0 0 -23 38 31 5 6 45 5 300 47 -24 5 9 -23 12 6 -24 41 15 .. .. .. 94 0 0 -24 4 31 5 6 46 4 300 47 -24 31 18 -23 37 58 -25 7 36 .. .. .. 95 0 0 -24 31 13 5 6 46 3 300 47 -24 58 9 -24 4 32 -25 34 39 .. .. .. 96 0 0 -24 58 37 5 6 46 2 299 46 -25 25 42 -24 31 46 -26 2 25 .. .. .. 97 0 0 -25 26 41 5 6 47 1 299 46 -25 53 56 .. .. .. -26 30 51 .. .. .. 98 0 0 -25 55 26 5 6 47 0 298 46 .. .. .. .. .. .. .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 1788-01093-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 13 06.4664 DE: +25 08 08.938 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .017 ) * V mag [mag]: 10.7 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (792) Metcalfia approx. diameter [km]: 61 approx. diameter ["]: .031 distance from Earth [AU]: 2.69100 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 720 number of rejected observations: 69 time covered by the observations: 1915 Feb 04 - 2006 Dec 12 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.012, 84° remarks: * orbital elements for (792) Metcalfia : Mean anomaly = 272.56982551 deg Arg. of pericenter = 227.54728743 deg Long. of node = 265.31245918 deg Inclination = 8.60962525 deg Eccentricity = 0.13293816 Semimajor axis = 2.62154985 AU Perihelion dist = 2.27304584 AU Mag: H = 10.10, G = 0.15 Epoch of elements : MJD 54314.21100000 TDT (2007 Aug 02.211) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 02 792 Metcalfia 5h 3.7m UT 10.7 3 13 6.466 25 8 8.94TYC 1788-01093-1 11.8 15.6 61 2.5 2.691 3.096 13.67 21.922 25.131 105.65 17.86 5.0624 .22564 -.69260 12.86684 4.18390 -0.00519 -0.00128 2000 271.5920212007 729.00000227.547287265.312459 8.6096250.132938162.621549852.2730458410.35 0.15 RATE 2.3220250 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.024 0.021 86.7 1.670 0.021 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org