IOTA/IOTA-ES occultation update for (6000) United Nations / TYC 0623-00642-1 event on 2008 Dec 03, 23:54 UT Visible from E Brazil, Venzuela, Caribbean, SE USA Summary ------- On 2008 Dec 03 UT, the 17 km diameter asteroid (6000) United Nations will occult a 10.5 mag star in the constellation Pisces for observers along a path across E Brazil, Venzuela, Caribbean, SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 14.8 mag (the magnitude of the asteroid) for at most 2.7 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: 19 * date and approx. time of event: 2008 Dec 03, 23:37 - 2008 Dec 04, 00:08 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 2.7 * Moon: 32 % sunlit, 70° distance * Sun: 139° distance * rough path description: E Brazil, Venzuela, Caribbean, SE USA The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 3.48 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .048", 65° ) * approx speed of asteroid's shadow [km/s]: 6.1128 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0623-00642-1 by 6000 United Nations on 2008 Dec 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 ' " Longitude Longitude Longitude Longitude 26 22 42 -63 0 0 23 37 8 2 297 -3 26 46 9 25 59 28 29 36 44 23 23 43 22 19 33 -62 0 0 23 37 10 4 301 -5 22 40 6 21 59 9 25 7 52 19 41 7 Latitude Latitude Latitude Latitude 21 0 0 -61 38 14 23 37 11 5 302 -5 -61 32 43 -61 43 45 -60 54 24 -62 22 14 20 0 0 -61 21 5 23 37 12 6 303 -5 -61 15 31 -61 26 38 -60 36 54 -62 5 25 19 0 0 -61 3 16 23 37 13 6 304 -6 -60 57 40 -61 8 52 -60 18 45 -61 47 58 18 0 0 -60 44 47 23 37 15 7 304 -6 -60 39 8 -60 50 26 -59 59 55 -61 29 50 17 0 0 -60 25 37 23 37 16 7 305 -7 -60 19 55 -60 31 18 -59 40 22 -61 11 2 16 0 0 -60 5 43 23 37 17 8 306 -7 -59 59 59 -60 11 28 -59 20 7 -60 51 32 15 0 0 -59 45 6 23 37 19 9 307 -8 -59 39 19 -59 50 54 -58 59 7 -60 31 18 14 0 0 -59 23 44 23 37 21 9 308 -8 -59 17 54 -59 29 35 -58 37 22 -60 10 19 13 0 0 -59 1 36 23 37 23 10 309 -8 -58 55 42 -59 7 29 -58 14 49 -59 48 35 12 0 0 -58 38 39 23 37 25 10 310 -9 -58 32 43 -58 44 36 -57 51 28 -59 26 4 11 0 0 -58 14 54 23 37 27 11 310 -9 -58 8 55 -58 20 54 -57 27 18 -59 2 43 10 0 0 -57 50 18 23 37 29 12 311 -10 -57 44 16 -57 56 21 -57 2 17 -58 38 33 9 0 0 -57 24 51 23 37 32 12 312 -10 -57 18 45 -57 30 57 -56 36 24 -58 13 32 8 0 0 -56 58 29 23 37 35 13 313 -11 -56 52 20 -57 4 39 -56 9 36 -57 47 37 7 0 0 -56 31 14 23 37 38 14 314 -11 -56 25 1 -56 37 27 -55 41 54 -57 20 49 6 0 0 -56 3 2 23 37 41 15 315 -12 -55 56 46 -56 9 18 -55 13 15 -56 53 4 5 0 0 -55 33 52 23 37 45 15 315 -12 -55 27 32 -55 40 12 -54 43 38 -56 24 22 4 0 0 -55 3 43 23 37 49 16 316 -13 -54 57 20 -55 10 6 -54 13 2 -55 54 41 3 0 0 -54 32 33 23 37 53 17 317 -13 -54 26 7 -54 39 0 -53 41 24 -55 24 0 2 0 0 -54 0 21 23 37 57 18 318 -14 -53 53 51 -54 6 52 -53 8 44 -54 52 17 1 0 0 -53 27 6 23 38 2 18 319 -14 -53 20 32 -53 33 40 -52 35 1 -54 19 30 0 0 0 -52 52 45 23 38 7 19 320 -15 -52 46 8 -52 59 23 -52 0 12 -53 45 38 - 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42 0 0 -12 20 5 23 48 56 68 2 -36 -12 12 36 -12 27 34 -11 20 47 -13 19 51 - 43 0 0 -11 9 16 23 49 22 69 5 -36 -11 1 50 -11 16 43 -10 10 15 -12 8 44 - 44 0 0 - 9 58 45 23 49 48 70 8 -36 - 9 51 21 -10 6 9 - 9 0 2 -10 57 54 - 45 0 0 - 8 48 34 23 50 13 71 11 -36 - 8 41 13 - 8 55 56 - 7 50 11 - 9 47 24 - 46 0 0 - 7 38 49 23 50 39 72 14 -36 - 7 31 30 - 7 46 8 - 6 40 45 - 8 37 18 - 47 0 0 - 6 29 32 23 51 5 73 18 -36 - 6 22 15 - 6 36 48 - 5 31 48 - 7 27 40 - 48 0 0 - 5 20 46 23 51 31 73 22 -36 - 5 13 32 - 5 28 0 - 4 23 23 - 6 18 32 - 49 0 0 - 4 12 34 23 51 57 74 26 -36 - 4 5 23 - 4 19 46 - 3 15 33 - 5 9 59 - 50 0 0 - 3 5 0 23 52 23 75 31 -35 - 2 57 52 - 3 12 9 - 2 8 21 - 4 2 3 - 51 0 0 - 1 58 7 23 52 49 75 36 -35 - 1 51 1 - 2 5 13 - 1 1 49 - 2 54 46 - 52 0 0 - 0 51 56 23 53 15 75 42 -35 - 0 44 54 - 0 58 59 0 3 59 - 1 48 13 - 53 0 0 0 13 29 23 53 40 76 47 -35 0 20 28 0 6 29 1 9 1 - 0 42 25 - 54 0 0 1 18 6 23 54 5 76 52 -34 1 25 3 1 11 9 2 13 16 0 22 36 - 55 0 0 2 21 53 23 54 31 75 58 -34 2 28 47 2 14 59 3 16 40 1 26 47 - 56 0 0 3 24 49 23 54 56 75 63 -34 3 31 40 3 17 58 4 19 13 2 30 7 - 57 0 0 4 26 51 23 55 20 75 68 -33 4 33 39 4 20 3 5 20 51 3 32 33 - 58 0 0 5 27 58 23 55 45 74 72 -33 5 34 43 5 21 13 6 21 35 4 34 4 - 59 0 0 6 28 8 23 56 9 74 76 -32 6 34 50 6 21 26 7 21 22 5 34 38 - 60 0 0 7 27 20 23 56 33 73 80 -32 7 34 0 7 20 41 8 20 10 6 34 14 - 61 0 0 8 25 33 23 56 57 72 83 -31 8 32 10 8 18 57 9 18 0 7 32 51 - 62 0 0 9 22 46 23 57 20 71 86 -31 9 29 19 9 16 13 10 14 49 8 30 28 - 63 0 0 10 18 58 23 57 43 71 89 -30 10 25 28 10 12 27 11 10 37 9 27 3 - 64 0 0 11 14 8 23 58 5 70 91 -30 11 20 35 11 7 40 12 5 24 10 22 37 - 65 0 0 12 8 15 23 58 27 69 93 -29 12 14 39 12 1 50 12 59 8 11 17 8 - 66 0 0 13 1 19 23 58 49 68 95 -29 13 7 41 12 54 58 13 51 49 12 10 35 - 67 0 0 13 53 20 23 59 11 67 97 -28 13 59 39 13 47 1 14 43 27 13 2 59 - 68 0 0 14 44 17 23 59 32 66 98 -28 14 50 33 14 38 1 15 34 2 13 54 20 - 69 0 0 15 34 10 23 59 52 65 99 -27 15 40 23 15 27 57 16 23 32 14 44 36 - 70 0 0 16 22 59 24 0 13 64 101 -26 16 29 9 16 16 49 17 11 59 15 33 47 - 71 0 0 17 10 45 24 0 33 63 102 -26 17 16 52 17 4 37 17 59 22 16 21 55 - 72 0 0 17 57 26 24 0 52 62 102 -25 18 3 30 17 51 21 18 45 41 17 8 58 - 73 0 0 18 43 3 24 1 11 61 103 -25 18 49 5 18 37 1 19 30 57 17 54 58 - 74 0 0 19 27 37 24 1 30 60 104 -24 19 33 36 19 21 38 20 15 9 18 39 53 - 75 0 0 20 11 7 24 1 48 59 104 -23 20 17 3 20 5 11 20 58 19 19 23 45 - 76 0 0 20 53 34 24 2 6 58 105 -23 20 59 28 20 47 41 21 40 25 20 6 33 - 77 0 0 21 34 59 24 2 23 57 105 -22 21 40 50 21 29 8 22 21 30 20 48 18 - 78 0 0 22 15 22 24 2 40 56 105 -21 22 21 10 22 9 33 23 1 32 21 29 1 - 79 0 0 22 54 43 24 2 57 55 105 -21 23 0 29 22 48 57 23 40 33 22 8 43 - 80 0 0 23 33 3 24 3 13 54 106 -20 23 38 46 23 27 19 24 18 34 22 47 22 - 81 0 0 24 10 22 24 3 29 53 106 -20 24 16 3 24 4 41 24 55 34 23 25 1 - 82 0 0 24 46 41 24 3 45 52 106 -19 24 52 20 24 41 2 25 31 34 24 1 39 - 83 0 0 25 22 1 24 4 0 51 106 -18 25 27 38 25 16 25 26 6 36 24 37 18 - 84 0 0 25 56 23 24 4 15 50 106 -18 26 1 57 25 50 48 26 40 39 25 11 57 - 85 0 0 26 29 46 24 4 29 49 106 -17 26 35 18 26 24 14 27 13 45 25 45 38 - 86 0 0 27 2 11 24 4 43 48 106 -16 27 7 41 26 56 41 27 45 53 26 18 21 - 87 0 0 27 33 40 24 4 57 47 106 -16 27 39 8 27 28 13 28 17 5 26 50 7 - 88 0 0 28 4 13 24 5 10 46 105 -15 28 9 39 27 58 48 28 47 22 27 20 57 - 89 0 0 28 33 51 24 5 23 45 105 -14 28 39 15 28 28 27 29 16 43 27 50 51 - 90 0 0 29 2 34 24 5 36 44 105 -14 29 7 56 28 57 13 29 45 10 28 19 50 - 91 0 0 29 30 23 24 5 48 43 105 -13 29 35 43 29 25 4 30 12 44 28 47 55 - 92 0 0 29 57 19 24 6 0 42 104 -12 30 2 37 29 52 1 30 39 25 29 15 6 - 93 0 0 30 23 23 24 6 12 41 104 -12 30 28 39 30 18 7 31 5 14 29 41 24 - 94 0 0 30 48 34 24 6 23 41 104 -11 30 53 48 30 43 20 31 30 11 30 6 49 - 95 0 0 31 12 55 24 6 34 40 104 -11 31 18 7 31 7 42 31 54 18 30 31 24 - 96 0 0 31 36 24 24 6 45 39 103 -10 31 41 35 31 31 14 32 17 34 30 55 7 - 97 0 0 31 59 5 24 6 55 38 103 -9 32 4 14 31 53 55 32 40 2 31 18 0 - 98 0 0 32 20 55 24 7 5 37 102 -9 32 26 3 32 15 48 33 1 40 31 40 4 - 99 0 0 32 41 58 24 7 15 36 102 -8 32 47 4 32 36 52 33 22 30 32 1 18 -100 0 0 33 2 12 24 7 25 35 102 -7 33 7 17 32 57 8 33 42 33 32 21 44 -101 0 0 33 21 39 24 7 34 34 101 -7 33 26 42 33 16 36 34 1 49 32 41 23 -102 0 0 33 40 20 24 7 43 34 101 -6 33 45 21 33 35 18 34 20 18 33 0 14 -103 0 0 33 58 14 24 7 52 33 100 -6 34 3 14 33 53 13 34 38 2 33 18 19 -104 0 0 34 15 22 24 8 0 32 100 -5 34 20 22 34 10 23 34 55 0 33 35 38 -105 0 0 34 31 46 24 8 9 31 100 -4 34 36 44 34 26 48 35 11 14 33 52 11 -106 0 0 34 47 25 24 8 17 30 99 -4 34 52 22 34 42 28 35 26 44 34 7 59 -107 0 0 35 2 20 24 8 24 29 99 -3 35 7 15 34 57 24 35 41 30 34 23 3 -108 0 0 35 16 31 24 8 32 29 98 -2 35 21 25 35 11 36 35 55 33 34 37 22 -109 0 0 35 29 59 24 8 39 28 98 -2 35 34 52 35 25 5 36 8 53 34 50 58 -110 0 0 35 42 44 24 8 46 27 97 -1 35 47 36 35 37 51 36 21 30 35 3 51 -111 0 0 35 54 47 24 8 53 26 97 -1 35 59 38 35 49 55 36 33 26 35 16 1 Uncertainty in time = +/- 10 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 0623-00642-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 56 38.3466 DE: +09 59 24.431 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .029 ) * V mag [mag]: 10.5 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6000) United Nations approx. diameter [km]: 17 approx. diameter ["]: .017 distance from Earth [AU]: 1.36300 * orbital information: orbit source: Preston date of fit: 2008 Oct 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 522 number of rejected observations: 5 time covered by the observations: 1987 Oct 27 - 2008 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.053, 0.040, 58° remarks: * orbital elements for (6000) United Nations : Mean anomaly = 27.45950430 deg Arg. of pericenter = 315.89106500 deg Long. of node = 52.26673409 deg Inclination = 14.41916281 deg Eccentricity = 0.18442052 Semimajor axis = 2.60174115 AU Perihelion dist = 2.12192669 AU Mag: H = 11.75, G = 0.15 Epoch of elements : MJD 54803.99600000 TDT (2008 Dec 03.996) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 3 6000 United Nations 23h 53.9m UT 10.5 1 56 38.347 9 59 24.43TYC 0623-00642-1 11.5 14.8 17 2.7 1.363 -0.943 17.34 -42.4945 9.985 179.07 -22.26 23.8985 -0.19426 -0.15657 -2.16365 2.68751 0.00349 0.00143 2000 26.52100620081130.00000315.891065 52.266734 14.4191630.18442052 2.6017412 2.121926711.5 5.00.15 RATE 2.3485940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.048 65 4.48 0.060 0 54796.5020081203_0642-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org