IOTA/IOTA-ES occultation update for (2677) Joan / HIP 68524 event on 2008 May 18, 08:40 UT Visible from New Zealand, Australia Summary ------- On 2008 May 18 UT, the 21 km diameter asteroid (2677) Joan will occult a 8.6 mag star in the constellation Virgo for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.3 mag to 15.9 mag (the magnitude of the asteroid) for at most 2.3 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: . The event at a glimpse ---------------------- * Rank: 18 * date and approx. time of event: 2008 May 18, 08:32 - 2008 May 18, 08:47 UT * magnitude of target star: 8.6 * magnitude drop [mag]: 7.3 * estimated maximum duration [s]: 2.3 * Moon: 97 % sunlit, 15° distance * Sun: 152° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 30 * 1 sigma uncertainty interval [path widths]: +/- 3.77 * 1 sigma uncertainty interval [seconds]: +/- 12.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .083 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .084", .051", 99° ) * approx speed of asteroid's shadow [km/s]: 8.9551 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 68524 by 2677 Joan on 2008 May 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 ' " Latitude Latitude Latitude Latitude 131 0 0 -18 19 54 8 47 46 20 90 -1 -18 11 26 -18 28 24 -17 8 12 -19 33 12 132 0 0 -18 41 11 8 47 40 21 89 -2 -18 32 40 -18 49 43 -17 29 12 -19 54 47 133 0 0 -19 3 9 8 47 33 21 89 -3 -18 54 36 -19 11 43 -17 50 52 -20 17 4 134 0 0 -19 25 48 8 47 27 22 88 -3 -19 17 13 -19 34 24 -18 13 13 -20 40 3 135 0 0 -19 49 8 8 47 20 23 88 -4 -19 40 31 -19 57 47 -18 36 14 -21 3 44 136 0 0 -20 13 9 8 47 13 24 87 -5 -20 4 29 -20 21 50 -18 59 55 -21 28 5 137 0 0 -20 37 49 8 47 6 25 87 -6 -20 29 7 -20 46 33 -19 24 16 -21 53 7 138 0 0 -21 3 10 8 46 58 26 86 -7 -20 54 25 -21 11 56 -19 49 15 -22 18 50 139 0 0 -21 29 10 8 46 50 27 86 -8 -21 20 23 -21 37 59 -20 14 54 -22 45 13 140 0 0 -21 55 49 8 46 42 28 85 -9 -21 46 59 -22 4 40 -20 41 11 -23 12 16 141 0 0 -22 23 7 8 46 34 28 84 -10 -22 14 14 -22 32 1 -21 8 6 -23 39 58 142 0 0 -22 51 3 8 46 26 29 84 -11 -22 42 7 -23 0 0 -21 35 39 -24 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2 22 -75 46 38 -78 3 26 - 71 0 0 -76 54 3 8 32 9 7 276 -26 -76 46 3 -77 2 4 -75 46 19 -78 3 9 - 70 0 0 -76 53 34 8 32 8 7 275 -26 -76 45 34 -77 1 35 -75 45 49 -78 2 42 - 69 0 0 -76 52 55 8 32 8 7 274 -26 -76 44 55 -77 0 56 -75 45 8 -78 2 5 - 68 0 0 -76 52 5 8 32 7 6 273 -26 -76 44 4 -77 0 7 -75 44 15 -78 1 18 - 67 0 0 -76 51 4 8 32 7 6 272 -25 -76 43 3 -76 59 7 -75 43 11 -78 0 21 - 66 0 0 -76 49 53 8 32 7 6 271 -25 -76 41 51 -76 57 56 -75 41 56 -77 59 14 - 65 0 0 -76 48 31 8 32 6 6 270 -25 -76 40 29 -76 56 34 -75 40 29 -77 57 56 - 64 0 0 -76 46 58 8 32 6 6 269 -25 -76 38 55 -76 55 2 .. .. .. -77 56 29 - 63 0 0 -76 45 13 8 32 5 5 268 -25 -76 37 10 -76 53 18 .. .. .. -77 54 52 - 62 0 0 -76 43 18 8 32 5 5 267 -24 -76 35 14 -76 51 24 .. .. .. -77 53 4 - 61 0 0 -76 41 12 8 32 5 5 266 -24 -76 33 7 -76 49 18 .. .. .. -77 51 5 - 60 0 0 -76 38 54 8 32 4 5 265 -24 -76 30 48 -76 47 2 .. .. .. -77 48 56 - 59 0 0 -76 36 25 8 32 4 4 264 -24 -76 28 18 -76 44 34 .. .. .. -77 46 37 - 58 0 0 -76 33 44 8 32 4 4 263 -23 -76 25 36 -76 41 54 .. .. .. -77 44 6 - 57 0 0 -76 30 52 8 32 3 4 262 -23 -76 22 42 -76 39 3 .. .. .. -77 41 25 - 56 0 0 -76 27 48 8 32 3 4 261 -23 -76 19 37 -76 36 0 .. .. .. -77 38 32 - 55 0 0 -76 24 32 8 32 3 3 260 -23 -76 16 19 -76 32 45 .. .. .. -77 35 28 - 54 0 0 -76 21 3 8 32 3 3 259 -23 -76 12 49 -76 29 18 .. .. .. -77 32 13 - 53 0 0 -76 17 23 8 32 2 3 258 -22 -76 9 7 -76 25 39 .. .. .. -77 28 46 - 52 0 0 -76 13 29 8 32 2 3 257 -22 -76 5 12 -76 21 48 .. .. .. -77 25 7 - 51 0 0 -76 9 23 8 32 2 2 256 -22 -76 1 4 -76 17 43 .. .. .. -77 21 17 - 50 0 0 -76 5 4 8 32 2 2 255 -22 -75 56 43 -76 13 26 .. .. .. -77 17 14 - 49 0 0 -76 0 32 8 32 2 2 254 -21 -75 52 9 -76 8 55 .. .. .. -77 12 58 - 48 0 0 -75 55 46 8 32 1 2 253 -21 -75 47 21 -76 4 12 .. .. .. -77 8 30 - 47 0 0 -75 50 46 8 32 1 1 252 -21 -75 42 19 -75 59 14 .. .. .. -77 3 49 - 46 0 0 -75 45 32 8 32 1 1 251 -21 -75 37 3 -75 54 2 .. .. .. -76 58 54 - 45 0 0 -75 40 4 8 32 1 1 250 -20 -75 31 33 -75 48 37 .. .. .. -76 53 46 - 44 0 0 -75 34 22 8 32 1 1 249 -20 -75 25 48 -75 42 56 .. .. .. -76 48 24 - 43 0 0 -75 28 24 8 32 1 0 248 -20 -75 19 48 -75 37 1 .. .. .. -76 42 48 - 42 0 0 -75 22 11 8 32 1 0 248 -20 -75 13 33 -75 30 51 .. .. .. -76 36 58 Uncertainty in time = +/- 13 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: HIP 68524 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 01 43.7001 DE: -05 39 58.791 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .025, .019 ) * V mag [mag]: 8.6 * B mag [mag]: 9.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2677) Joan approx. diameter [km]: 21 approx. diameter ["]: .015 distance from Earth [AU]: 1.92800 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 762 number of rejected observations: 17 time covered by the observations: 1930 Mar 23 - 2008 Apr 17 1 sigma uncertainty ellipse (major, minor, PA): 0.080, 0.047, 100° remarks: * orbital elements for (2677) Joan : Mean anomaly = 6.37738364 deg Arg. of pericenter = 18.08282550 deg Long. of node = 194.97296382 deg Inclination = 10.07127249 deg Eccentricity = 0.04462015 Semimajor axis = 2.99348055 AU Perihelion dist = 2.85991100 AU Mag: H = 11.50, G = 0.15 Epoch of elements : MJD 54604.36200000 TDT (2008 May 18.362) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 18 2677 Joan 8h 40.4m UT 8.6 14 1 43.700- 5 39 58.79HIP 68524 9.9 15.9 21 2.3 1.928 -1.320 11.95 -156.0691 -5.670 49.02 19.67 8.6729 -0.36684 -0.60339 -4.32107 2.62231 0.00223 -0.00140 2000 5.5472942008 514.00000 18.082826194.972964 10.0712720.04462015 2.9934806 2.859911011.6 5.00.15 RATE 1.9030030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.084 0.051 99 4.77 0.057 0 54594.5020080518__68524 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org