IOTA/IOTA-ES occultation update for (3028) Zhangguoxi / TYC 5706-01318-1 event on 2008 Jul 02, 10:35 UT Visible from S USA, Mexico, Hawaii Summary ------- On 2008 Jul 02 UT, the 26 km diameter asteroid (3028) Zhangguoxi will occult a 9.6 mag star in the constellation Scutum for observers along a path across S USA, Mexico, Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.0 mag (the magnitude of the asteroid) for at most 2.1 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: 25 * date and approx. time of event: 2008 Jul 02, 10:27 - 2008 Jul 02, 10:42 UT * magnitude of target star: 9.6 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 2.1 * Moon: 1 % sunlit, 158° distance * Sun: 165° distance * rough path description: S USA, Mexico, Hawaii The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 2.74 * 1 sigma uncertainty interval [seconds]: +/- 8.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .072 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .049", 85° ) * approx speed of asteroid's shadow [km/s]: 12.0410 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5706-01318-1 by 3028 Zhangguoxi on 2008 Jul 2 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 120 0 0 21 41 38 10 42 52 4 101 0 21 49 42 21 33 35 22 34 2 .. .. .. 121 0 0 21 33 7 10 42 51 5 101 -1 21 41 10 21 25 4 22 25 30 .. .. .. 122 0 0 21 24 43 10 42 51 6 101 -2 21 32 46 21 16 40 22 17 5 20 32 45 123 0 0 21 16 26 10 42 50 6 102 -3 21 24 29 21 8 23 22 8 47 20 24 30 124 0 0 21 8 16 10 42 48 7 102 -4 21 16 19 21 0 14 22 0 36 20 16 22 125 0 0 21 0 15 10 42 47 8 102 -5 21 8 17 20 52 13 21 52 33 20 8 21 126 0 0 20 52 21 10 42 46 9 103 -5 21 0 23 20 44 19 21 44 38 20 0 28 127 0 0 20 44 35 10 42 44 10 103 -6 20 52 37 20 36 33 21 36 51 19 52 43 128 0 0 20 36 57 10 42 42 11 104 -7 20 44 59 20 28 55 21 29 12 19 45 6 129 0 0 20 29 27 10 42 40 12 104 -8 20 37 29 20 21 26 21 21 41 19 37 38 130 0 0 20 22 5 10 42 38 13 104 -9 20 30 7 20 14 4 21 14 18 19 30 17 131 0 0 20 14 52 10 42 36 14 105 -10 20 22 54 20 6 51 21 7 4 19 23 5 132 0 0 20 7 48 10 42 33 15 105 -11 20 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0 0 22 8 10 10 31 18 51 221 -38 22 16 13 22 0 8 23 0 31 21 16 14 -129 0 0 22 16 52 10 31 11 50 222 -37 22 24 55 22 8 49 23 9 14 21 24 55 -128 0 0 22 25 39 10 31 3 50 223 -37 22 33 43 22 17 37 23 18 2 21 33 41 -127 0 0 22 34 33 10 30 56 49 224 -36 22 42 36 22 26 30 23 26 57 21 42 34 -126 0 0 22 43 31 10 30 49 48 225 -36 22 51 35 22 35 28 23 35 56 21 51 31 -125 0 0 22 52 35 10 30 42 48 226 -35 23 0 39 22 44 32 23 45 1 22 0 34 -124 0 0 23 1 44 10 30 35 47 227 -34 23 9 48 22 53 41 23 54 11 22 9 42 -123 0 0 23 10 58 10 30 28 46 228 -34 23 19 2 23 2 55 24 3 26 22 18 55 -122 0 0 23 20 17 10 30 21 45 229 -33 23 28 21 23 12 13 24 12 46 22 28 13 -121 0 0 23 29 40 10 30 15 45 229 -32 23 37 45 23 21 36 24 22 10 22 37 35 -120 0 0 23 39 8 10 30 8 44 230 -32 23 47 13 23 31 4 24 31 39 22 47 2 -119 0 0 23 48 40 10 30 2 43 231 -31 23 56 45 23 40 36 24 41 12 22 56 33 -118 0 0 23 58 16 10 29 55 42 232 -30 24 6 21 23 50 12 24 50 49 23 6 8 -117 0 0 24 7 56 10 29 49 41 233 -29 24 16 1 23 59 52 25 0 29 23 15 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3 25 36 3 -102 0 0 26 38 36 10 28 28 29 242 -18 26 46 43 26 30 31 27 31 19 25 46 19 -101 0 0 26 48 53 10 28 24 28 243 -17 26 57 0 26 40 47 27 41 37 25 56 35 -100 0 0 26 59 11 10 28 20 27 244 -16 27 7 17 26 51 5 27 51 54 26 6 52 - 99 0 0 27 9 29 10 28 16 26 244 -16 27 17 35 27 1 23 28 2 13 26 17 10 - 98 0 0 27 19 47 10 28 12 25 245 -15 27 27 54 27 11 41 28 12 31 26 27 28 - 97 0 0 27 30 6 10 28 8 25 245 -14 27 38 12 27 22 0 28 22 50 26 37 47 - 96 0 0 27 40 24 10 28 4 24 246 -13 27 48 31 27 32 18 28 33 8 26 48 5 - 95 0 0 27 50 42 10 28 0 23 246 -12 27 58 49 27 42 36 28 43 27 26 58 23 - 94 0 0 28 0 59 10 27 57 22 247 -12 28 9 6 27 52 53 28 53 44 27 8 40 - 93 0 0 28 11 16 10 27 53 21 247 -11 28 19 23 28 3 10 29 4 1 27 18 57 - 92 0 0 28 21 32 10 27 50 20 248 -10 28 29 39 28 13 26 29 14 17 27 29 13 - 91 0 0 28 31 47 10 27 47 19 249 -9 28 39 54 28 23 41 29 24 32 27 39 28 - 90 0 0 28 42 1 10 27 44 18 249 -8 28 50 8 28 33 55 29 34 46 27 49 42 - 89 0 0 28 52 13 10 27 41 18 250 -7 29 0 20 28 44 7 29 44 58 27 59 54 - 88 0 0 29 2 24 10 27 38 17 250 -7 29 10 30 28 54 18 29 55 8 28 10 5 - 87 0 0 29 12 33 10 27 36 16 251 -6 29 20 39 29 4 27 30 5 17 28 20 14 - 86 0 0 29 22 39 10 27 33 15 251 -5 29 30 46 29 14 33 30 15 23 28 30 21 - 85 0 0 29 32 44 10 27 31 14 252 -4 29 40 50 29 24 38 30 25 28 28 40 25 - 84 0 0 29 42 46 10 27 29 13 252 -3 29 50 52 29 34 40 30 35 29 28 50 28 - 83 0 0 29 52 46 10 27 27 12 253 -2 30 0 52 29 44 40 30 45 29 29 0 28 - 82 0 0 30 2 42 10 27 25 11 253 -2 30 10 49 29 54 37 30 55 25 29 10 25 - 81 0 0 30 12 36 10 27 23 11 254 -1 30 20 43 30 4 31 31 5 18 29 20 19 Uncertainty in time = +/- 9 secs [Prediction of 2008 Jun 19.0] Data for the target star ------------------------ * name: TYC 5706-01318-1 * constellation : Scutum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 56 17.6132 DE: -08 29 13.364 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .022 ) * V mag [mag]: 9.6 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3028) Zhangguoxi approx. diameter [km]: 26 approx. diameter ["]: .018 distance from Earth [AU]: 2.01200 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 750 number of rejected observations: 39 time covered by the observations: 1904 Sep 19 - 2008 May 27 1 sigma uncertainty ellipse (major, minor, PA): 0.070, 0.044, 85° remarks: * orbital elements for (3028) Zhangguoxi : Mean anomaly = 76.14239855 deg Arg. of pericenter = 14.30366476 deg Long. of node = 189.70729644 deg Inclination = 9.50021145 deg Eccentricity = 0.02627580 Semimajor axis = 3.02333601 AU Perihelion dist = 2.94389542 AU Mag: H = 10.74, G = 0.15 Epoch of elements : MJD 54649.44100000 TDT (2008 Jul 02.441) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 2 3028 Zhangguoxi 10h 35.1m UT 9.6 18 56 17.613- 8 29 13.36TYC 5706-01318-1 10.0 15.0 26 2.1 2.012 -1.995 -2.59 -155.5296 -8.486 22.27 22.99 10.5842 -0.03980 0.45780 -6.77060 -0.59010 -0.00022 -0.00142 2000 74.3723212008 623.00000 14.303665189.707296 9.5002110.02627580 3.0233360 2.943895410.7 5.00.15 RATE 1.8748840 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.072 0.049 85 3.74 0.049 0 54636.5020080702_1318-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 19, 01:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org