IOTA/IOTA-ES occultation update for (362) Havnia / TYC 1247-01205-1 event on 2007 Aug 02, 08:49 UT Visible from Uruguay, Argentina, Chile Summary ------- On 2007 Aug 02 UT, the 90 km diameter asteroid (362) Havnia will occult a 12.0 mag star in the constellation Taurus 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 2.2 mag to 14.1 mag (the magnitude of the asteroid) for at most 3.3 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: 79 * date and approx. time of event: 2007 Aug 02, 08:46 - 2007 Aug 02, 08:52 UT * midpoint of event [JD]: 2454314.86790417 * magnitude of target star: 12.0 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 3.3 * Moon: 86 % sunlit, 66° distance * Sun: 71° distance * rough path description: Uruguay, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 113 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .027", 358° ) * approx speed of asteroid's shadow [km/s]: 27.2491 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1247-01205-1 by 362 Havnia on 2007 Aug 02 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 - 88 0 0 .. .. .. .. .. .. .. .. .. .. .. .. -51 7 37 .. .. .. .. .. .. - 87 0 0 -51 18 25 8 46 41 0 55 -42 -51 55 53 -50 41 19 .. .. .. .. .. .. - 86 0 0 -50 51 46 8 46 41 1 54 -42 -51 29 19 -50 14 35 -52 21 48 .. .. .. - 85 0 0 -50 24 41 8 46 41 2 53 -42 -51 2 19 -49 47 25 -51 54 55 .. .. .. - 84 0 0 -49 57 9 8 46 42 3 52 -41 -50 34 52 -49 19 48 -51 27 35 .. .. .. - 83 0 0 -49 29 11 8 46 42 4 52 -41 -50 6 59 -48 51 46 -50 59 48 .. .. .. - 82 0 0 -49 0 47 8 46 42 4 51 -40 -49 38 39 -48 23 18 -50 31 35 .. .. .. - 81 0 0 -48 31 58 8 46 42 5 50 -40 -49 9 54 -47 54 25 -50 2 56 -47 3 13 - 80 0 0 -48 2 44 8 46 43 6 49 -39 -48 40 44 -47 25 8 -49 33 51 -46 33 51 - 79 0 0 -47 33 6 8 46 43 7 49 -39 -48 11 9 -46 55 27 -49 4 20 -46 4 5 - 78 0 0 -47 3 4 8 46 44 8 48 -38 -47 41 10 -46 25 22 -48 34 25 -45 33 57 - 77 0 0 -46 32 39 8 46 44 9 47 -38 -47 10 48 -45 54 54 -48 4 7 -45 3 26 - 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Data for the target star ------------------------ * name: TYC 1247-01205-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 43 58.8397 DE: +20 54 14.140 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .032 ) * V mag [mag]: 12.0 * B mag [mag]: 13.0 * Apparent position with proper motion RA(deg): 56.1055314373 DE(deg): 20.9294297723 * Equation of equinoxes (radians) : 0.000032996187128 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (362) Havnia approx. diameter [km]: 90 approx. diameter ["]: .048 distance from Earth [AU]: 2.60900 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 704 number of rejected observations: 120 time covered by the observations: 1903 Sep 15 - 2006 Nov 17 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 68° remarks: * orbital elements for (362) Havnia : Mean anomaly = 338.06757060 deg Arg. of pericenter = 32.26246824 deg Long. of node = 27.39964990 deg Inclination = 8.07153886 deg Eccentricity = 0.04414544 Semimajor axis = 2.57880757 AU Perihelion dist = 2.46496497 AU Mag: H = 9.03, G = 0.15 Epoch of elements : MJD 54314.36800000 TDT (2007 Aug 02.368) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 02 362 Havnia 8h 49.8m UT 12.0 3 43 58.840 20 54 14.14TYC 1247-01205-1 13.1 14.1 90 3.3 2.609 3.491 17.17 -27.024 20.899 49.13 17.82 8.8297 .20139 -.57180 14.51198 5.09427 -0.00500 -0.00111 2000 337.0279902007 729.00000 32.262468 27.399650 8.0715390.044145442.578807572.464964979.005 0.15 RATE 2.3799930 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.034 0.027 358.1 1.690 0.033 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 09, 00:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org