IOTA/IOTA-ES occultation update for (1722) Goffin / TYC 0665-00498-1 event on 2008 Oct 18, 04:24 UT Visible from Europe, Venezuela, Colombia, Peru Summary ------- On 2008 Oct 18 UT, the 26 km diameter asteroid (1722) Goffin will occult a 10.9 mag star in the constellation Taurus for observers along a path across Europe, Venezuela, Colombia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 16.0 mag (the magnitude of the asteroid) for at most 4.5 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: 38 * date and approx. time of event: 2008 Oct 18, 04:08 - 2008 Oct 18, 04:42 UT * midpoint of event [JD]: 2454757.68390417 * magnitude of target star: 10.9 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 4.5 * Moon: 85 % sunlit, 15° distance * Sun: 143° distance * rough path description: Europe, Venezuela, Colombia, Peru The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 1.75 * 1 sigma uncertainty interval [seconds]: +/- 9.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .034", 83° ) * approx speed of asteroid's shadow [km/s]: 5.8240 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0665-00498-1 by 1722 Goffin on 2008 Oct 18 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 -118 57 45 -23 0 0 4 42 33 1 75 -35 -119 27 13 -118 28 49 ... .. .. -116 51 25 -115 20 30 -22 0 0 4 42 29 5 73 -39 -115 46 13 -114 55 7 -117 19 17 -113 28 50 Latitude Latitude Latitude Latitude -115 0 0 -21 53 54 4 42 29 5 73 -39 -21 46 19 -22 1 28 -21 19 47 -22 27 56 -114 0 0 -21 35 35 4 42 27 6 73 -40 -21 27 59 -21 43 10 -21 1 21 -22 9 43 -113 0 0 -21 16 36 4 42 24 7 73 -41 -21 8 58 -21 24 13 -20 42 16 -21 50 51 -112 0 0 -20 56 57 4 42 22 8 72 -42 -20 49 18 -21 4 36 -20 22 30 -21 31 19 -111 0 0 -20 36 39 4 42 19 9 72 -43 -20 28 59 -20 44 19 -20 2 5 -21 11 8 -110 0 0 -20 15 41 4 42 16 10 72 -44 -20 7 59 -20 23 23 -19 41 0 -20 50 17 -109 0 0 -19 54 3 4 42 12 11 71 -45 -19 46 19 -20 1 46 -19 19 14 -20 28 46 -108 0 0 -19 31 45 4 42 8 12 71 -46 -19 23 59 -19 39 30 -18 56 49 -20 6 36 -107 0 0 -19 8 47 4 42 4 13 71 -47 -19 1 0 -19 16 33 -18 33 43 -19 43 45 -106 0 0 -18 45 9 4 41 59 14 70 -48 -18 37 20 -18 52 57 -18 9 57 -19 20 15 -105 0 0 -18 20 51 4 41 54 15 70 -49 -18 13 0 -18 28 41 -17 45 31 -18 56 5 -104 0 0 -17 55 53 4 41 49 16 70 -50 -17 48 0 -18 3 45 -17 20 25 -18 31 15 -103 0 0 -17 30 15 4 41 43 17 69 -51 -17 22 21 -17 38 9 -16 54 39 -18 5 45 -102 0 0 -17 3 57 4 41 37 18 69 -52 -16 56 1 -17 11 53 -16 28 13 -17 39 36 -101 0 0 -16 37 0 4 41 30 19 69 -53 -16 29 2 -16 44 57 -16 1 7 -17 12 47 -100 0 0 -16 9 23 4 41 24 20 69 -54 -16 1 23 -16 17 22 -15 33 22 -16 45 18 - 99 0 0 -15 41 6 4 41 16 21 69 -55 -15 33 4 -15 49 7 -15 4 56 -16 17 10 - 98 0 0 -15 12 10 4 41 9 22 68 -56 -15 4 6 -15 20 13 -14 35 52 -15 48 23 - 97 0 0 -14 42 35 4 41 0 23 68 -57 -14 34 29 -14 50 40 -14 6 7 -15 18 57 - 96 0 0 -14 12 20 4 40 52 24 68 -58 -14 4 13 -14 20 28 -13 35 44 -14 48 51 - 95 0 0 -13 41 28 4 40 43 26 68 -59 -13 33 18 -13 49 37 -13 4 43 -14 18 7 - 94 0 0 -13 9 56 4 40 34 27 68 -60 -13 1 45 -13 18 7 -12 33 2 -13 46 44 - 93 0 0 -12 37 46 4 40 24 28 67 -61 -12 29 33 -12 46 0 -12 0 44 -13 14 44 - 92 0 0 -12 4 59 4 40 14 29 67 -62 -11 56 44 -12 13 14 -11 27 47 -12 42 5 - 91 0 0 -11 31 34 4 40 4 30 67 -63 -11 23 17 -11 39 51 -10 54 13 -12 8 49 - 90 0 0 -10 57 32 4 39 53 31 67 -64 -10 49 13 -11 5 51 -10 20 2 -11 34 56 - 89 0 0 -10 22 53 4 39 42 32 67 -65 -10 14 32 -10 31 15 - 9 45 14 -11 0 27 - 88 0 0 - 9 47 39 4 39 30 33 67 -66 - 9 39 15 - 9 56 2 - 9 9 51 -10 25 21 - 87 0 0 - 9 11 48 4 39 18 34 67 -67 - 9 3 23 - 9 20 14 - 8 33 51 - 9 49 40 - 86 0 0 - 8 35 23 4 39 5 35 67 -68 - 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2007 Dec 05 1 sigma uncertainty ellipse (major, minor, PA): 0.045, 0.026, 80° remarks: * orbital elements for (1722) Goffin : Mean anomaly = 318.30590304 deg Arg. of pericenter = 285.04302108 deg Long. of node = 168.21845136 deg Inclination = 5.46627202 deg Eccentricity = 0.04939026 Semimajor axis = 2.51368437 AU Perihelion dist = 2.38953283 AU Mag: H = 12.00, G = 0.15 Epoch of elements : MJD 54757.18400000 TDT (2008 Oct 18.184) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 18 1722 Goffin 4h 24.8m UT 10.9 4 4 47.846 13 19 22.19TYC 0665-00498-1 12.9 16.0 26 4.5 1.556 -1.010 -11.34 -32.0432 13.326 110.08 -9.74 4.4137 -0.14363 0.18758 -2.60404 -2.00624 -0.00343 -0.00009 2000 316.52924320081011.00000285.043021168.218451 5.4662720.04939026 2.5136844 2.389532812.3 5.00.15 RATE 2.4730790 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.034 83 2.75 0.040 0 54721.5020081018_0498-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 12, 18:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org