IOTA/IOTA-ES occultation update for (3759) Piironen / TYC 7376-00650-1 event on 2008 Jul 04, 01:56 UT Visible from Africa, Caribbean, S USA Summary ------- On 2008 Jul 04 UT, the 32 km diameter asteroid (3759) Piironen will occult a 11.5 mag star in the constellation Scorpius for observers along a path across Africa, Caribbean, S USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 16.3 mag (the magnitude of the asteroid) for at most 2.5 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: 21 * date and approx. time of event: 2008 Jul 04, 01:49 - 2008 Jul 04, 02:03 UT * midpoint of event [JD]: 2454651.58102917 * magnitude of target star: 11.5 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 2.5 * Moon: 1 % sunlit, 150° distance * Sun: 162° distance * rough path description: Africa, Caribbean, S USA The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 3.21 * 1 sigma uncertainty interval [seconds]: +/- 8.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .096 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .097", .057", 81° ) * approx speed of asteroid's shadow [km/s]: 13.1404 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7376-00650-1 by 3759 Piironen on 2008 Jul 4 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 -100 0 0 38 46 21 2 3 34 5 137 0 39 0 26 38 32 18 40 32 5 37 3 16 - 99 0 0 38 1 27 2 3 33 6 137 -1 38 15 32 37 47 25 39 47 6 36 18 27 - 98 0 0 37 16 11 2 3 32 8 138 -2 37 30 15 37 2 10 39 1 43 35 33 17 - 97 0 0 36 30 35 2 3 31 9 139 -3 36 44 38 36 16 35 38 15 59 34 47 50 - 96 0 0 35 44 42 2 3 29 10 139 -4 35 58 43 35 30 43 37 29 55 34 2 6 - 95 0 0 34 58 32 2 3 27 11 140 -5 35 12 32 34 44 35 36 43 34 33 16 8 - 94 0 0 34 12 9 2 3 25 12 140 -7 34 26 7 33 58 14 35 56 57 32 29 58 - 93 0 0 33 25 35 2 3 22 13 141 -8 33 39 31 33 11 42 35 10 7 31 43 38 - 92 0 0 32 38 51 2 3 20 14 142 -9 32 52 44 32 25 0 34 23 6 30 57 10 - 91 0 0 31 52 0 2 3 17 15 142 -10 32 5 51 31 38 11 33 35 56 30 10 36 - 90 0 0 31 5 4 2 3 14 16 143 -11 31 18 53 30 51 18 32 48 40 29 23 59 - 89 0 0 30 18 5 2 3 10 18 143 -12 30 31 51 30 4 22 32 1 20 28 37 21 - 88 0 0 29 31 6 2 3 7 19 144 -13 29 44 49 29 17 26 31 13 58 27 50 43 - 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Uncertainty in time = +/- 11 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: TYC 7376-00650-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 41 52.8895 DE: -30 36 02.058 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .030 ) * V mag [mag]: 11.5 * B mag [mag]: 12.1 * Apparent position with proper motion RA(deg): 265.6171235904 DE(deg): -30.6065166083 * Equation of equinoxes (radians) : 0.000051395961331 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3759) Piironen approx. diameter [km]: 32 approx. diameter ["]: .021 distance from Earth [AU]: 2.05300 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 560 number of rejected observations: 21 time covered by the observations: 1984 Jan 05 - 2007 Aug 09 1 sigma uncertainty ellipse (major, minor, PA): 0.093, 0.049, 80° remarks: * orbital elements for (3759) Piironen : Mean anomaly = 171.37529224 deg Arg. of pericenter = 164.80051068 deg Long. of node = 293.03070116 deg Inclination = 13.07115792 deg Eccentricity = 0.11698201 Semimajor axis = 2.72176932 AU Perihelion dist = 2.40337128 AU Mag: H = 11.72, G = 0.15 Epoch of elements : MJD 54651.08100000 TDT (2008 Jul 04.081) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 4 3759 Piironen 1h 56.7m UT 11.5 17 41 52.890-30 36 2.06TYC 7376-00650-1 12.1 16.3 32 2.5 2.053 -2.302 11.18 -46.1568 -30.603 151.94 22.85 1.9447 0.18016 0.47945 -6.94222 2.61042 0.00161 0.00063 2000 171.1380172008 7 3.00000164.800511293.030701 13.0711580.11698201 2.7217693 2.403371311.9 5.00.15 RATE 2.1949620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.097 0.057 81 4.21 0.067 0 54612.5020080704_0650-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 16:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org