IOTA/IOTA-ES occultation update for (2521) Heidi / TYC 6844-03602-1 event on 2008 Jul 09, 19:27 UT Visible from Africa Summary ------- On 2008 Jul 09 UT, the 15 km diameter asteroid (2521) Heidi will occult a 10.1 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.3 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: 13 * date and approx. time of event: 2008 Jul 09, 19:17 - 2008 Jul 09, 19:35 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 5.6 * estimated maximum duration [s]: 1.3 * Moon: 47 % sunlit, 81° distance * Sun: 167° distance * rough path description: Africa Additional comments ------------------- 13" double m10.3/m11.8 The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 5.23 * 1 sigma uncertainty interval [seconds]: +/- 8.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .082 +/- .055) * 1 sigma uncertainty ellipse (major, minor, PA): ( .083", .054", 81° ) * approx speed of asteroid's shadow [km/s]: 11.5741 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6844-03602-1 by 2521 Heidi on 2008 Jul 9 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 - 18 0 0 11 9 46 19 35 54 12 117 0 11 14 20 11 5 12 12 2 9 10 17 31 - 17 0 0 10 41 28 19 35 52 13 118 -1 10 46 2 10 36 54 11 33 52 9 49 12 - 16 0 0 10 13 6 19 35 50 14 118 -2 10 17 40 10 8 32 11 5 30 9 20 51 - 15 0 0 9 44 42 19 35 47 15 118 -3 9 49 16 9 40 8 10 37 6 8 52 26 - 14 0 0 9 16 16 19 35 44 16 118 -4 9 20 50 9 11 42 10 8 40 8 24 1 - 13 0 0 8 47 49 19 35 41 17 118 -5 8 52 22 8 43 15 9 40 12 7 55 34 - 12 0 0 8 19 21 19 35 38 18 118 -7 8 23 55 8 14 47 9 11 43 7 27 6 - 11 0 0 7 50 53 19 35 35 19 119 -8 7 55 27 7 46 19 8 43 15 6 58 40 - 10 0 0 7 22 26 19 35 31 21 119 -9 7 27 0 7 17 53 8 14 47 6 30 14 - 9 0 0 6 54 2 19 35 27 22 119 -10 6 58 35 6 49 28 7 46 21 6 1 51 - 8 0 0 6 25 39 19 35 23 23 119 -11 6 30 13 6 21 6 7 17 57 5 33 30 - 7 0 0 5 57 20 19 35 19 24 119 -12 6 1 53 5 52 47 6 49 36 5 5 12 - 6 0 0 5 29 5 19 35 15 25 119 -13 5 33 38 5 24 32 6 21 19 4 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Uncertainty in time = +/- 10 secs [Prediction of 2008 Jul 2.0] Data for the target star ------------------------ * name: TYC 6844-03602-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 22 01.7588 DE: -23 44 34.635 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.1 * B mag [mag]: 12.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2521) Heidi approx. diameter [km]: 15 approx. diameter ["]: .011 distance from Earth [AU]: 1.86400 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 737 number of rejected observations: 19 time covered by the observations: 1960 Feb 01 - 2008 Jun 22 1 sigma uncertainty ellipse (major, minor, PA): 0.080, 0.050, 80° remarks: * orbital elements for (2521) Heidi : Mean anomaly = 100.81178482 deg Arg. of pericenter = 247.46754000 deg Long. of node = 281.45776513 deg Inclination = 7.73347976 deg Eccentricity = 0.08925011 Semimajor axis = 2.79675773 AU Perihelion dist = 2.54714680 AU Mag: H = 11.46, G = 0.15 Epoch of elements : MJD 54656.81100000 TDT (2008 Jul 09.811) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 9 2521 Heidi 19h 27.0m UT 10.1 18 22 1.759-23 44 34.64TYC 6844-03602-1 12.0 15.7 15 1.3 1.864 -2.212 5.15 55.6484 -23.744 -110.42 22.24 19.4503 0.02330 0.13925 -6.44085 1.09187 0.00126 0.00009 2000 99.3765182008 7 3.00000247.467540281.457765 7.7334800.08925011 2.7967577 2.547146811.7 5.00.15 RATE 2.1072780 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.083 0.054 81 6.23 0.058 0 54649.5020080709_3602-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 02, 19:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org