IOTA/IOTA-ES occultation update for (1419) Danzig / TYC 6254-02498-1 event on 2008 May 21, 20:05 UT Visible from Indonesia, Africa Summary ------- On 2008 May 21 UT, the 16 km diameter asteroid (1419) Danzig will occult a 9.8 mag star in the constellation Sagittarius for observers along a path across Indonesia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.7 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: 33 * date and approx. time of event: 2008 May 21, 19:55 - 2008 May 21, 20:16 UT * midpoint of event [JD]: 2454608.33709167 * magnitude of target star: 9.8 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 1.7 * Moon: 97 % sunlit, 15° distance * Sun: 151° distance * rough path description: Indonesia, Africa The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 2.04 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .026", 89° ) * approx speed of asteroid's shadow [km/s]: 9.3971 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6254-02498-1 by 1419 Danzig on 2008 May 21 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 5 0 0 27 25 24 20 16 24 0 109 -22 27 30 9 27 20 39 27 49 32 27 1 19 6 0 0 27 6 23 20 16 24 1 110 -23 27 11 8 27 1 38 27 30 33 26 42 16 7 0 0 26 47 6 20 16 24 2 110 -24 26 51 51 26 42 20 27 11 18 26 22 56 8 0 0 26 27 32 20 16 23 3 111 -25 26 32 18 26 22 46 26 51 46 26 3 21 9 0 0 26 7 42 20 16 22 4 111 -26 26 12 29 26 2 56 26 31 58 25 43 29 10 0 0 25 47 37 20 16 21 5 112 -26 25 52 24 25 42 50 26 11 55 25 23 22 11 0 0 25 27 16 20 16 20 6 112 -27 25 32 4 25 22 29 25 51 36 25 3 0 12 0 0 25 6 41 20 16 19 7 113 -28 25 11 28 25 1 54 25 31 2 24 42 22 13 0 0 24 45 51 20 16 18 8 113 -29 24 50 39 24 41 3 25 10 14 24 21 31 14 0 0 24 24 47 20 16 16 9 113 -30 24 29 35 24 19 59 24 49 11 24 0 25 15 0 0 24 3 28 20 16 14 10 114 -31 24 8 17 23 58 40 24 27 55 23 39 5 16 0 0 23 41 57 20 16 12 11 114 -32 23 46 45 23 37 8 24 6 25 23 17 32 17 0 0 23 20 12 20 16 10 12 115 -33 23 25 1 23 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- 8 41 45 - 8 50 42 - 8 23 28 - 9 8 57 144 0 0 - 8 42 1 19 56 50 37 255 -9 - 8 37 33 - 8 46 30 - 8 19 15 - 9 4 46 145 0 0 - 8 37 26 19 56 43 36 255 -8 - 8 32 57 - 8 41 55 - 8 14 39 - 9 0 11 146 0 0 - 8 32 28 19 56 36 35 255 -7 - 8 27 59 - 8 36 57 - 8 9 40 - 8 55 14 147 0 0 - 8 27 6 19 56 29 35 255 -6 - 8 22 37 - 8 31 35 - 8 4 17 - 8 49 53 148 0 0 - 8 21 21 19 56 22 34 255 -5 - 8 16 51 - 8 25 50 - 7 58 31 - 8 44 8 149 0 0 - 8 15 12 19 56 16 33 255 -4 - 8 10 42 - 8 19 42 - 7 52 21 - 8 38 1 150 0 0 - 8 8 40 19 56 10 32 255 -3 - 8 4 10 - 8 13 10 - 7 45 48 - 8 31 30 151 0 0 - 8 1 45 19 56 4 31 255 -2 - 7 57 15 - 8 6 15 - 7 38 51 - 8 24 36 152 0 0 - 7 54 26 19 55 58 30 255 -1 - 7 49 56 - 7 58 56 - 7 31 32 - 8 17 18 153 0 0 - 7 46 44 19 55 52 29 255 0 - 7 42 13 - 7 51 14 - 7 23 48 - 8 9 37 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 9.0] Data for the target star ------------------------ * name: TYC 6254-02498-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 51.2564 DE: -17 07 54.475 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 9.8 * B mag [mag]: 10.6 * Apparent position with proper motion RA(deg): 269.5931833645 DE(deg): -17.1344286322 * Equation of equinoxes (radians) : 0.000040497144560 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1419) Danzig approx. diameter [km]: 16 approx. diameter ["]: .013 distance from Earth [AU]: 1.69600 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 894 number of rejected observations: 51 time covered by the observations: 1917 Apr 13 - 2007 May 21 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.017, 88° remarks: * orbital elements for (1419) Danzig : Mean anomaly = 170.89213202 deg Arg. of pericenter = 232.16732909 deg Long. of node = 213.70505170 deg Inclination = 5.72567395 deg Eccentricity = 0.14669168 Semimajor axis = 2.29347075 AU Perihelion dist = 1.95703769 AU Mag: H = 11.25, G = 0.15 Epoch of elements : MJD 54607.83700000 TDT (2008 May 21.837) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 21 1419 Danzig 20h 5.4m UT 9.8 17 57 51.256-17 7 54.48TYC 6254-02498-1 10.6 15.2 16 1.7 1.696 -1.854 7.16 88.2774 -17.133 -122.19 20.39 20.0902 0.06145 0.22731 -5.12135 1.37994 -0.00264 -0.00052 2000 168.6682382008 514.00000232.167329213.705052 5.7256740.14669168 2.2934708 1.957037711.3 5.00.15 RATE 2.8376850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.026 89 3.04 0.027 0 54565.5020080521_2498-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org