IOTA/IOTA-ES occultation update for (1366) Piccolo / TYC 5536-00980-1 event on 2008 Jul 10, 21:24 UT Visible from NW Africa Summary ------- On 2008 Jul 10 UT, the 28 km diameter asteroid (1366) Piccolo will occult a 9.8 mag star in the constellation Virgo for observers along a path across NW Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.0 mag to 15.8 mag (the magnitude of the asteroid) for at most 1.7 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: 41 * date and approx. time of event: 2008 Jul 10, 21:24 - 2008 Jul 10, 21:28 UT * midpoint of event [JD]: 2454658.3921125 * magnitude of target star: 9.8 * magnitude drop [mag]: 6.0 * estimated maximum duration [s]: 1.7 * Moon: 57 % sunlit, 9° distance * Sun: 89° distance * rough path description: NW Africa The occultation path -------------------- * approximate projected width [km]: 52 * 1 sigma uncertainty interval [path widths]: +/- 1.59 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .024", 107° ) * approx speed of asteroid's shadow [km/s]: 16.0274 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5536-00980-1 by 1366 Piccolo on 2008 Jul 10 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 49 28 43 0 0 21 24 8 32 213 0 - 27 17 26 - 26 21 17 - 28 44 55 - 24 49 59 - 25 22 7 42 0 0 21 24 19 32 215 -2 - 25 50 21 - 24 53 37 - 27 18 38 - 23 21 15 - 23 51 49 41 0 0 21 24 29 32 217 -3 - 24 20 26 - 23 22 55 - 25 49 45 - 21 49 10 - 22 18 12 40 0 0 21 24 40 32 219 -5 - 22 47 17 - 21 48 49 - 24 17 56 - 20 13 19 - 20 40 50 39 0 0 21 24 51 32 221 -7 - 21 10 30 - 20 10 51 - 22 42 50 - 18 33 9 - 18 59 10 38 0 0 21 25 3 32 223 -8 - 19 29 34 - 18 28 25 - 21 3 58 - 16 48 0 - 17 12 32 37 0 0 21 25 15 32 225 -10 - 17 43 50 - 16 40 50 - 19 20 48 - 14 57 2 - 15 20 5 36 0 0 21 25 28 31 227 -12 - 15 52 29 - 14 47 11 - 17 32 39 - 12 59 9 - 13 20 41 35 0 0 21 25 41 31 230 -14 - 13 54 30 - 12 46 19 - 15 38 38 - 10 52 53 - 11 12 52 34 0 0 21 25 54 30 232 -16 - 11 48 29 - 10 36 35 - 13 37 38 - 8 36 8 Latitude Latitude Latitude Latitude - 11 0 0 33 54 12 21 25 56 30 232 -16 33 38 3 34 10 30 32 47 32 35 3 16 - 10 0 0 33 27 45 21 26 2 29 233 -17 33 11 44 33 43 54 32 21 40 34 36 11 - 9 0 0 33 2 16 21 26 8 29 234 -18 32 46 23 33 18 17 31 56 43 34 10 6 - 8 0 0 32 37 45 21 26 14 29 235 -19 32 22 0 32 53 37 31 32 43 33 45 0 - 7 0 0 32 14 11 21 26 20 28 236 -20 31 58 33 32 29 56 31 9 39 33 20 54 - 6 0 0 31 51 35 21 26 26 28 237 -21 31 36 5 32 7 13 30 47 31 32 57 47 - 5 0 0 31 29 57 21 26 31 27 238 -21 31 14 33 31 45 28 30 26 20 32 35 40 - 4 0 0 31 9 16 21 26 37 26 239 -22 30 53 58 31 24 41 30 6 4 32 14 31 - 3 0 0 30 49 33 21 26 42 26 240 -23 30 34 21 31 4 51 29 46 45 31 54 21 - 2 0 0 30 30 46 21 26 47 25 241 -24 30 15 40 30 45 59 29 28 21 31 35 9 - 1 0 0 30 12 57 21 26 52 25 242 -25 29 57 56 30 28 4 29 10 53 31 16 56 0 0 0 29 56 4 21 26 57 24 242 -26 29 41 8 30 11 7 28 54 21 30 59 41 1 0 0 29 40 8 21 27 2 23 243 -26 29 25 17 29 55 6 28 38 44 30 43 25 2 0 0 29 25 9 21 27 7 23 244 -27 29 10 23 29 40 2 28 24 3 30 28 6 3 0 0 29 11 6 21 27 11 22 245 -28 28 56 24 29 25 55 28 10 17 30 13 45 4 0 0 28 58 0 21 27 16 21 245 -29 28 43 21 29 12 45 27 57 26 30 0 21 5 0 0 28 45 49 21 27 20 20 246 -29 28 31 14 29 0 30 27 45 30 29 47 55 6 0 0 28 34 35 21 27 24 20 247 -30 28 20 3 28 49 12 27 34 29 29 36 25 7 0 0 28 24 16 21 27 28 19 247 -31 28 9 47 28 38 50 27 24 22 29 25 53 8 0 0 28 14 52 21 27 32 18 248 -31 28 0 26 28 29 24 27 15 10 29 16 17 9 0 0 28 6 24 21 27 35 17 249 -32 27 52 1 28 20 54 27 6 53 29 7 38 10 0 0 27 58 52 21 27 39 17 249 -33 27 44 30 28 13 18 26 59 29 28 59 55 11 0 0 27 52 14 21 27 42 16 250 -33 27 37 55 28 6 39 26 53 0 28 53 8 12 0 0 27 46 31 21 27 45 15 251 -34 27 32 14 28 0 54 26 47 24 28 47 18 13 0 0 27 41 43 21 27 48 14 251 -34 27 27 28 27 56 5 26 42 43 28 42 23 14 0 0 27 37 50 21 27 51 13 252 -35 27 23 36 27 52 10 26 38 55 28 38 24 15 0 0 27 34 51 21 27 54 12 252 -35 27 20 38 27 49 10 26 36 0 28 35 20 16 0 0 27 32 47 21 27 56 12 253 -36 27 18 34 27 47 5 26 33 59 28 33 12 17 0 0 27 31 36 21 27 58 11 253 -36 27 17 25 27 45 54 26 32 51 28 31 59 18 0 0 27 31 20 21 28 0 10 254 -36 27 17 9 27 45 37 26 32 37 28 31 42 19 0 0 27 31 58 21 28 2 9 254 -37 27 17 47 27 46 15 26 33 15 28 32 19 20 0 0 27 33 30 21 28 4 8 255 -37 27 19 18 27 47 47 26 34 47 28 33 51 21 0 0 27 35 56 21 28 6 7 255 -37 27 21 44 27 50 13 26 37 11 28 36 18 22 0 0 27 39 15 21 28 7 6 256 -38 27 25 2 27 53 33 26 40 28 28 39 40 23 0 0 27 43 27 21 28 8 6 256 -38 27 29 14 27 57 46 26 44 37 28 43 56 24 0 0 27 48 34 21 28 9 5 257 -38 27 34 19 28 2 54 .. .. .. 28 49 7 25 0 0 27 54 33 21 28 10 4 257 -38 27 40 18 28 8 55 .. .. .. 28 55 12 26 0 0 28 1 26 21 28 11 3 258 -38 27 47 9 28 15 49 .. .. .. 29 2 12 27 0 0 28 9 13 21 28 11 2 258 -38 27 54 54 28 23 37 .. .. .. 29 10 6 28 0 0 28 17 52 21 28 12 1 259 -39 28 3 31 28 32 18 .. .. .. 29 18 54 29 0 0 28 27 24 21 28 12 0 259 -39 28 13 1 28 41 53 .. .. .. 29 28 36 Uncertainty in time = +/- 3 secs [Prediction of 2008 Jun 4.0] Data for the target star ------------------------ * name: TYC 5536-00980-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 02 14.2033 DE: -09 29 25.114 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .019 ) * V mag [mag]: 9.8 * B mag [mag]: 10.5 * Apparent position with proper motion RA(deg): 195.6730206984 DE(deg): -9.5379332811 * Equation of equinoxes (radians) : 0.000050926743023 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1366) Piccolo approx. diameter [km]: 28 approx. diameter ["]: .015 distance from Earth [AU]: 2.63200 * orbital information: orbit source: Preston date of fit: 2008 Jun 04 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 983 number of rejected observations: 60 time covered by the observations: 1932 Nov 29 - 2008 Jun 03 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.015, 125° remarks: * orbital elements for (1366) Piccolo : Mean anomaly = 287.22609282 deg Arg. of pericenter = 284.19484376 deg Long. of node = 24.22430775 deg Inclination = 9.47166772 deg Eccentricity = 0.14228637 Semimajor axis = 2.87241738 AU Perihelion dist = 2.46371153 AU Mag: H = 10.26, G = 0.15 Epoch of elements : MJD 54657.89200000 TDT (2008 Jul 10.892) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 10 1366 Piccolo 21h 24.6m UT 9.8 13 2 14.203- 9 29 25.11TYC 5536-00980-1 10.5 15.8 28 1.7 2.632 1.789 -14.61 -54.7718 -9.486 -139.79 22.10 21.4107 0.40703 0.73987 7.91905 -4.37311 0.00512 -0.00213 2000 285.6283032008 7 3.00000284.194844 24.224308 9.4716680.14228637 2.8724174 2.463711510.5 5.00.15 RATE 2.0245690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.024 107 2.59 0.023 0 54621.5020080710_0980-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 06, 22:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org