IOTA/IOTA-ES occultation update for (684) Hildburg / TYC 1208-01579-1 event on 2012 Nov 03, 18:36 UT Visible from Russia, Europe Summary ------- On 2012 Nov 03 UT, the 16 km diameter asteroid (684) Hildburg will occult a 9.7 mag star in the constellation Pisces for observers along a path across Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 14.1 mag (the magnitude of the asteroid) for at most 1.5 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: 24 * date and approx. time of event: 2012 Nov 03, 18:30 - 2012 Nov 03, 18:43 UT * geocentric midpoint of event [JD]: 2456235.27579583 * magnitude of target star: 9.7 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 1.5 * Moon: 79 % sunlit, 67° distance * Sun: 166° distance * rough path description: Russia, Europe The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 2.84 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .038", 355° ) * approx speed of asteroid's shadow [km/s]: 10.6166 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1208-01579-1 by 684 Hildburg on 2012 Nov 3 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 - 23 0 0 29 51 24 18 43 45 15 77 -1 29 58 18 29 44 32 30 37 45 29 5 45 - 22 0 0 30 19 34 18 43 41 16 77 -2 30 26 30 30 12 40 31 6 7 29 33 43 - 21 0 0 30 48 8 18 43 37 17 78 -3 30 55 5 30 41 11 31 34 53 30 2 5 - 20 0 0 31 17 4 18 43 33 17 79 -4 31 24 3 31 10 6 32 4 2 30 30 50 - 19 0 0 31 46 23 18 43 29 18 79 -5 31 53 24 31 39 23 32 33 33 30 59 57 - 18 0 0 32 16 3 18 43 24 19 80 -6 32 23 6 32 9 2 33 3 26 31 29 25 - 17 0 0 32 46 4 18 43 19 20 80 -7 32 53 8 32 39 0 33 33 39 31 59 14 - 16 0 0 33 16 24 18 43 14 21 81 -7 33 23 31 33 9 19 34 4 12 32 29 22 - 15 0 0 33 47 3 18 43 9 22 82 -8 33 54 11 33 39 56 34 35 4 32 59 49 - 14 0 0 34 18 0 18 43 3 23 82 -9 34 25 10 34 10 51 35 6 13 33 30 33 - 13 0 0 34 49 13 18 42 58 24 83 -10 34 56 25 34 42 2 35 37 39 34 1 34 - 12 0 0 35 20 42 18 42 52 25 84 -11 35 27 56 35 13 29 36 9 21 34 32 51 - 11 0 0 35 52 26 18 42 46 25 85 -12 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.. .. -172 0 0 59 45 42 18 30 6 0 308 -4 59 53 29 59 37 56 60 38 7 .. .. .. Uncertainty in time = +/- 4 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 1208-01579-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 37 58.8289 DE: +18 26 53.588 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .039 ) * V mag [mag]: 9.7 * B mag [mag]: 11.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (684) Hildburg approx. diameter [km]: 16 approx. diameter ["]: .015 distance from Earth [AU]: 1.51000 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1141 number of rejected observations: 59 time covered by the observations: 1909 Aug 19 - 2012 Oct 20 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.019, 65° remarks: * orbital elements for (684) Hildburg : Mean anomaly = 124.93391416 deg Arg. of pericenter = 289.70589237 deg Long. of node = 336.54587770 deg Inclination = 5.51956746 deg Eccentricity = 0.03486520 Semimajor axis = 2.43227474 AU Perihelion dist = 2.34747300 AU Mag: H = 10.81, G = 0.15 Epoch of elements : MJD 56234.77600000 TDT (2012 Nov 03.776) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 3 684 Hildburg 18h 37.1m UT 9.7 1 37 58.829 18 26 53.59TYC 1208-01579-1 11.2 14.1 16 1.5 1.510 -2.302 -12.01 61.7867 18.453 -103.39 -15.36 18.6191 -0.24276 0.66418 -5.62637 -2.06191 0.00137 -0.00026 2000 123.69297820121030.00000289.705892336.545878 5.5195670.03486520 2.4322747 2.347473010.8 5.00.15 RATE 2.5982750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.038 355 3.84 0.042 0 0-1-2 056226.0020121103_1579-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org