IOTA/IOTA-ES occultation update for (3759) Piironen / TYC 7376-00020-1 event on 2008 Jul 10, 02:46 UT Visible from Brazil, Colombia, Central America, Mexico Summary ------- On 2008 Jul 10 UT, the 32 km diameter asteroid (3759) Piironen will occult a 11.1 mag star in the constellation Scorpius for observers along a path across Brazil, Colombia, Central America, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 16.5 mag (the magnitude of the asteroid) for at most 2.6 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: 20 * date and approx. time of event: 2008 Jul 10, 02:39 - 2008 Jul 10, 02:54 UT * midpoint of event [JD]: 2454657.61592083 * magnitude of target star: 11.1 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 2.6 * Moon: 50 % sunlit, 67° distance * Sun: 156° distance * rough path description: Brazil, Colombia, Central America, Mexico The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 3.32 * 1 sigma uncertainty interval [seconds]: +/- 9.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .095 +/- .060) * 1 sigma uncertainty ellipse (major, minor, PA): ( .096", .059", 82° ) * approx speed of asteroid's shadow [km/s]: 12.1546 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7376-00020-1 by 3759 Piironen 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 ' " Latitude Latitude Latitude Latitude -115 0 0 34 41 13 2 54 31 11 140 -1 34 54 45 34 27 42 36 25 42 32 58 58 -114 0 0 33 54 6 2 54 28 13 140 -2 34 7 38 33 40 36 35 38 31 32 11 55 -113 0 0 33 6 39 2 54 25 14 141 -3 33 20 10 32 53 10 34 50 57 31 24 34 -112 0 0 32 18 53 2 54 23 15 141 -4 32 32 23 32 5 25 34 3 3 30 36 57 -111 0 0 31 30 52 2 54 19 16 142 -5 31 44 20 31 17 25 33 14 52 29 49 5 -110 0 0 30 42 36 2 54 16 17 142 -6 30 56 3 30 29 11 32 26 24 29 1 1 -109 0 0 29 54 9 2 54 12 18 143 -7 30 7 35 29 40 46 31 37 44 28 12 46 -108 0 0 29 5 33 2 54 9 19 144 -9 29 18 56 28 52 11 30 48 53 27 24 24 -107 0 0 28 16 49 2 54 4 21 144 -10 28 30 11 28 3 30 29 59 52 26 35 56 -106 0 0 27 28 0 2 54 0 22 145 -11 27 41 20 27 14 43 29 10 46 25 47 24 -105 0 0 26 39 9 2 53 55 23 145 -12 26 52 26 26 25 55 28 21 36 24 58 51 -104 0 0 25 50 18 2 53 50 24 146 -13 26 3 32 25 37 6 27 32 24 24 10 20 -103 0 0 25 1 29 2 53 45 25 146 -14 25 14 40 24 48 19 26 43 12 23 21 51 -102 0 0 24 12 43 2 53 40 26 147 -16 24 25 52 23 59 37 25 54 4 22 33 27 -101 0 0 23 24 4 2 53 34 28 147 -17 23 37 10 23 11 1 25 5 1 21 45 11 -100 0 0 22 35 34 2 53 28 29 148 -18 22 48 36 22 22 34 24 16 5 20 57 4 - 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Uncertainty in time = +/- 12 secs [Prediction of 2008 Jun 6.0] Data for the target star ------------------------ * name: TYC 7376-00020-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 36 37.7550 DE: -30 08 06.247 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .034 ) * V mag [mag]: 11.1 * B mag [mag]: 11.6 * Apparent position with proper motion RA(deg): 264.3033848638 DE(deg): -30.1422816928 * Equation of equinoxes (radians) : 0.000051052914287 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3759) Piironen approx. diameter [km]: 32 approx. diameter ["]: .021 distance from Earth [AU]: 2.08100 * orbital information: orbit source: Preston date of fit: 2008 Jun 04 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): 0.091, 0.049, 81° remarks: * orbital elements for (3759) Piironen : Mean anomaly = 172.68784610 deg Arg. of pericenter = 164.81059079 deg Long. of node = 293.03058978 deg Inclination = 13.07122171 deg Eccentricity = 0.11695380 Semimajor axis = 2.72184437 AU Perihelion dist = 2.40351431 AU Mag: H = 11.72, G = 0.15 Epoch of elements : MJD 54657.11600000 TDT (2008 Jul 10.116) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 10 3759 Piironen 2h 46.9m UT 11.1 17 36 37.755-30 8 6.25TYC 7376-00020-1 11.6 16.5 32 2.6 2.081 -2.036 11.90 -65.9795 -30.138 139.62 22.20 2.7821 0.18597 0.41391 -6.25561 2.81641 0.00226 0.00052 2000 171.1259752008 7 3.00000164.810591293.030590 13.0712220.11695380 2.7218444 2.403514311.9 5.00.15 RATE 2.1948720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.096 0.059 82 4.32 0.070 0 54623.5020080710_0020-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 06, 22:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org