IOTA/IOTA-ES occultation update for (1650) Heckmann / HIP 59150 event on 2008 Jan 03, 07:42 UT Visible from Uruguay, Argentina, Chile Summary ------- On 2008 Jan 03 UT, the 29 km diameter asteroid (1650) Heckmann will occult a 8.6 mag star in the constellation Virgo 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 7.5 mag to 16.1 mag (the magnitude of the asteroid) for at most 2.1 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: 57 * date and approx. time of event: 2008 Jan 03, 07:36 - 2008 Jan 03, 07:49 UT * magnitude of target star: 8.6 * magnitude drop [mag]: 7.5 * estimated maximum duration [s]: 2.1 * Moon: 23 % sunlit, 41° distance * Sun: 99° distance * rough path description: Uruguay, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 1.09 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .020", 108° ) * approx speed of asteroid's shadow [km/s]: 13.7614 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 59150 by 1650 Heckmann on 2008 Jan 03 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 -124 0 0 - 9 15 35 7 36 18 1 93 -56 - 9 25 1 - 9 6 9 - 9 45 40 .. .. .. -123 0 0 - 9 19 37 7 36 18 2 93 -56 - 9 29 4 - 9 10 11 - 9 49 44 .. .. .. -122 0 0 - 9 24 10 7 36 19 3 93 -57 - 9 33 37 - 9 14 44 - 9 54 18 .. .. .. -121 0 0 - 9 29 14 7 36 19 4 93 -57 - 9 38 42 - 9 19 47 - 9 59 23 .. .. .. -120 0 0 - 9 34 48 7 36 20 5 92 -57 - 9 44 17 - 9 25 21 -10 4 59 - 9 4 47 -119 0 0 - 9 40 53 7 36 21 6 92 -57 - 9 50 22 - 9 31 25 -10 11 6 - 9 10 51 -118 0 0 - 9 47 29 7 36 22 7 92 -57 - 9 56 59 - 9 38 1 -10 17 44 - 9 17 25 -117 0 0 - 9 54 36 7 36 23 8 92 -57 -10 4 6 - 9 45 7 -10 24 53 - 9 24 29 -116 0 0 -10 2 13 7 36 25 9 92 -57 -10 11 44 - 9 52 43 -10 32 33 - 9 32 4 -115 0 0 -10 10 21 7 36 26 10 92 -57 -10 19 53 -10 0 50 -10 40 43 - 9 40 10 -114 0 0 -10 19 0 7 36 28 11 91 -57 -10 28 32 -10 9 28 -10 49 24 - 9 48 46 -113 0 0 -10 28 9 7 36 30 12 91 -57 -10 37 43 -10 18 37 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Data for the target star ------------------------ * name: HIP 59150 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 07 49.1179 DE: -03 07 50.063 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .013, .010 ) * V mag [mag]: 8.6 * B mag [mag]: 9.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1650) Heckmann approx. diameter [km]: 29 approx. diameter ["]: .019 distance from Earth [AU]: 2.06500 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 999 number of rejected observations: 69 time covered by the observations: 1906 Jul 31 - 2007 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.018, 111° remarks: * orbital elements for (1650) Heckmann : Mean anomaly = 281.06235509 deg Arg. of pericenter = 57.18237737 deg Long. of node = 199.94766951 deg Inclination = 2.74559584 deg Eccentricity = 0.16367737 Semimajor axis = 2.43488039 AU Perihelion dist = 2.03634558 AU Mag: H = 11.41, G = 0.15 Epoch of elements : MJD 54468.32100000 TDT (2008 Jan 03.321) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 1650 Heckmann 7h 42.8m UT 8.6 12 7 49.118- 3 7 50.06HIP 59150 9.1 16.1 29 2.1 2.065 2.018 -13.46 -36.056 -3.127 65.35 -22.87 7.7129 -.22151 -.50020 7.09552 -3.15985 -0.00527 0.00232 2000 278.90379920071226.00000 57.182377199.947670 2.7455960.163677372.434880392.0363455811.55 0.15 RATE 2.5941060 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.035 0.020 108.1 2.090 0.021 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 04:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org