IOTA/IOTA-ES occultation update for (2816) Pien / TYC 5585-00848-1 event on 2008 May 08, 07:17 UT Visible from Uruguay, Argentina, Chile Summary ------- On 2008 May 08 UT, the 22 km diameter asteroid (2816) Pien will occult a 10.0 mag star in the constellation Libra for observers along a path across Uruguay, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 15.9 mag (the magnitude of the asteroid) for at most 1.6 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: 19 * date and approx. time of event: 2008 May 08, 07:09 - 2008 May 08, 07:24 UT * midpoint of event [JD]: 2454594.8037 * magnitude of target star: 10.0 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 1.6 * Moon: 11 % sunlit, 140° distance * Sun: 172° distance * rough path description: Uruguay, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 3.49 * 1 sigma uncertainty interval [seconds]: +/- 8.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .080 +/- .055) * 1 sigma uncertainty ellipse (major, minor, PA): ( .082", .052", 107° ) * approx speed of asteroid's shadow [km/s]: 13.4172 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5585-00848-1 by 2816 Pien on 2008 May 8 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 160 0 0 -11 5 32 7 24 43 0 100 -5 -10 59 4 -11 12 1 .. .. .. -11 57 22 161 0 0 -11 15 56 7 24 43 1 100 -6 -11 9 27 -11 22 25 .. .. .. -12 7 47 162 0 0 -11 26 31 7 24 43 2 99 -7 -11 20 2 -11 33 0 .. .. .. -12 18 23 163 0 0 -11 37 16 7 24 43 3 99 -8 -11 30 47 -11 43 46 .. .. .. -12 29 11 164 0 0 -11 48 13 7 24 42 4 99 -9 -11 41 44 -11 54 43 .. .. .. -12 40 9 165 0 0 -11 59 20 7 24 41 5 99 -10 -11 52 51 -12 5 50 -11 7 40 -12 51 18 166 0 0 -12 10 38 7 24 41 6 99 -11 -12 4 8 -12 17 8 -11 18 56 -13 2 37 167 0 0 -12 22 5 7 24 39 7 98 -12 -12 15 35 -12 28 35 -11 30 22 -13 14 6 168 0 0 -12 33 43 7 24 38 8 98 -13 -12 27 13 -12 40 13 -11 41 58 -13 25 45 169 0 0 -12 45 30 7 24 37 9 98 -14 -12 38 59 -12 52 0 -11 53 43 -13 37 34 170 0 0 -12 57 26 7 24 36 10 98 -15 -12 50 55 -13 3 56 -12 5 38 -13 49 32 171 0 0 -13 9 31 7 24 34 11 97 -16 -13 3 0 -13 16 2 -12 17 41 -14 1 38 172 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16 0 0 -31 39 31 7 9 59 6 262 -7 -31 33 3 -31 45 59 -30 48 3 -32 31 17 - 15 0 0 -31 30 28 7 9 58 5 262 -6 -31 24 0 -31 36 56 -30 38 58 -32 22 16 - 14 0 0 -31 21 14 7 9 58 4 261 -5 -31 14 45 -31 27 42 -30 29 42 -32 13 3 - 13 0 0 -31 11 48 7 9 57 4 261 -4 -31 5 19 -31 18 17 .. .. .. -32 3 39 - 12 0 0 -31 2 11 7 9 57 3 260 -3 -30 55 42 -31 8 40 .. .. .. -31 54 4 - 11 0 0 -30 52 23 7 9 57 2 260 -3 -30 45 53 -30 58 52 .. .. .. -31 44 17 - 10 0 0 -30 42 23 7 9 56 1 259 -2 -30 35 54 -30 48 53 .. .. .. -31 34 20 - 9 0 0 -30 32 13 7 9 56 0 259 -1 -30 25 43 -30 38 42 .. .. .. -31 24 11 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 31.0] Data for the target star ------------------------ * name: TYC 5585-00848-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 16 52.1946 DE: -09 35 51.359 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .022 ) * V mag [mag]: 10.0 * B mag [mag]: 11.8 * Apparent position with proper motion RA(deg): 229.3381098750 DE(deg): -9.6315934211 * Equation of equinoxes (radians) : 0.000039553314832 * remarks:no mean pos in Tycho2 Data for the minor planet ------------------------- * general information: (number) name: (2816) Pien approx. diameter [km]: 22 approx. diameter ["]: .015 distance from Earth [AU]: 1.98000 * orbital information: orbit source: Preston date of fit: 2008 Mar 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 702 number of rejected observations: 23 time covered by the observations: 1955 Oct 11 - 2008 Jan 18 1 sigma uncertainty ellipse (major, minor, PA): 0.077, 0.047, 110° remarks: * orbital elements for (2816) Pien : Mean anomaly = 249.60475976 deg Arg. of pericenter = 263.53356017 deg Long. of node = 94.00455290 deg Inclination = 7.72279972 deg Eccentricity = 0.18969626 Semimajor axis = 2.72519322 AU Perihelion dist = 2.20823426 AU Mag: H = 11.80, G = 0.15 Epoch of elements : MJD 54594.30400000 TDT (2008 May 08.304) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 8 2816 Pien 7h 17.3m UT 10.0 15 16 52.195- 9 35 51.36TYC 5585-00848-1 11.8 15.9 22 1.6 1.980 -2.241 5.75 -106.6078 -9.600 69.79 17.22 7.2888 -0.06113 -0.35274 -7.46164 1.29433 -0.00033 -0.00076 2000 248.6618282008 5 4.00000263.533560 94.004553 7.7228000.18969626 2.7251932 2.208234311.7 5.00.15 RATE 2.1908270 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.082 0.052 107 4.49 0.052 0 54556.5020080508_0848-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org