IOTA/IOTA-ES occultation update for (449) Hamburga / 2UCAC 22773548 event on 2008 Mar 02, 19:56 UT Visible from E Russia Summary ------- On 2008 Mar 02 UT, the 86 km diameter asteroid (449) Hamburga will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 15.1 mag (the magnitude of the asteroid) for at most 3.0 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: 78 * date and approx. time of event: 2008 Mar 02, 19:54 - 2008 Mar 02, 19:55 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 3.0 * Moon: 25 % sunlit, 5° distance * Sun: 64° distance * rough path description: E Russia The occultation path -------------------- * approximate projected width [km]: 200 * 1 sigma uncertainty interval [path widths]: +/- 0.71 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .028", 90° ) * approx speed of asteroid's shadow [km/s]: 28.7292 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 22773548 by 449 Hamburga on 2008 Mar 2 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 160 0 0 43 7 30 19 55 33 22 161 0 42 12 22 44 4 37 40 57 7 45 29 41 159 0 0 43 18 5 19 55 30 21 160 -1 42 22 45 44 15 26 41 7 15 45 40 51 158 0 0 43 29 23 19 55 28 21 159 -2 42 33 50 44 26 58 41 18 4 45 52 47 157 0 0 43 41 24 19 55 25 20 158 -3 42 45 38 44 39 15 41 29 34 46 5 29 156 0 0 43 54 9 19 55 23 20 157 -3 42 58 7 44 52 16 41 41 45 46 18 57 155 0 0 44 7 36 19 55 20 20 156 -4 43 11 19 45 6 0 41 54 37 46 33 11 154 0 0 44 21 46 19 55 18 19 155 -5 43 25 12 45 20 29 42 8 9 46 48 10 153 0 0 44 36 38 19 55 16 18 154 -6 43 39 47 45 35 41 42 22 22 47 3 55 152 0 0 44 52 13 19 55 14 18 153 -6 43 55 4 45 51 37 42 37 15 47 20 25 151 0 0 45 8 30 19 55 12 17 153 -7 44 11 1 46 8 16 42 52 48 47 37 41 150 0 0 45 25 30 19 55 10 17 152 -8 44 27 40 46 25 39 43 9 1 47 55 42 149 0 0 45 43 11 19 55 8 16 151 -8 44 44 59 46 43 44 43 25 53 48 14 28 148 0 0 46 1 33 19 55 6 16 150 -9 45 2 59 47 2 32 43 43 25 48 34 0 147 0 0 46 20 37 19 55 4 15 149 -10 45 21 39 47 22 3 44 1 35 48 54 16 146 0 0 46 40 22 19 55 2 14 148 -11 45 40 59 47 42 16 44 20 24 49 15 17 145 0 0 47 0 47 19 55 0 14 147 -11 46 0 58 48 3 12 44 39 51 49 37 2 144 0 0 47 21 54 19 54 59 13 147 -12 46 21 37 48 24 49 44 59 57 49 59 32 143 0 0 47 43 40 19 54 57 12 146 -13 46 42 55 48 47 8 45 20 39 50 22 46 142 0 0 48 6 6 19 54 56 12 145 -13 47 4 51 49 10 8 45 41 59 50 46 43 141 0 0 48 29 11 19 54 55 11 144 -14 47 27 25 49 33 48 46 3 55 51 11 25 140 0 0 48 52 56 19 54 53 10 143 -15 47 50 38 49 58 10 46 26 28 51 36 51 139 0 0 49 17 19 19 54 52 9 143 -15 48 14 27 50 23 12 46 49 36 52 2 59 138 0 0 49 42 20 19 54 51 9 142 -16 48 38 53 50 48 54 47 13 20 52 29 51 137 0 0 50 7 59 19 54 50 8 141 -16 49 3 56 51 15 15 47 37 39 52 57 26 136 0 0 50 34 16 19 54 49 7 140 -17 49 29 34 51 42 15 48 2 31 53 25 43 135 0 0 51 1 9 19 54 48 7 139 -17 49 55 48 52 9 54 48 27 57 53 54 42 134 0 0 51 28 38 19 54 47 6 139 -18 50 22 36 52 38 11 48 53 57 54 24 24 133 0 0 51 56 43 19 54 47 5 138 -18 50 49 59 53 7 6 49 20 28 54 54 47 132 0 0 52 25 22 19 54 46 4 137 -19 51 17 54 53 36 38 .. .. .. 55 25 52 131 0 0 52 54 37 19 54 46 3 136 -19 51 46 23 54 6 46 .. .. .. 55 57 37 130 0 0 53 24 24 19 54 45 3 135 -20 52 15 23 54 37 30 .. .. .. 56 30 3 129 0 0 53 54 45 19 54 45 2 135 -20 52 44 55 55 8 49 .. .. .. .. .. .. 128 0 0 54 25 38 19 54 45 1 134 -21 53 14 57 55 40 43 .. .. .. .. .. .. 127 0 0 54 57 2 19 54 45 0 133 -21 53 45 28 .. .. .. .. .. .. .. .. .. Uncertainty in time = +/- 3 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: 2UCAC 22773548 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 36 24.4526 DE: -22 51 30.694 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .025 ) * V mag [mag]: 11.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (449) Hamburga approx. diameter [km]: 86 approx. diameter ["]: .039 distance from Earth [AU]: 3.04800 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 900 number of rejected observations: 92 time covered by the observations: 1901 Mar 17 - 2007 Jul 25 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.013, 90° remarks: * orbital elements for (449) Hamburga : Mean anomaly = 109.99331114 deg Arg. of pericenter = 46.61771830 deg Long. of node = 86.03904547 deg Inclination = 3.08953001 deg Eccentricity = 0.17076978 Semimajor axis = 2.55411135 AU Perihelion dist = 2.11794631 AU Mag: H = 9.79, G = 0.15 Epoch of elements : MJD 54527.83100000 TDT (2008 Mar 02.831) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 2 449 Hamburga 19h 56.3m UT 11.4 18 36 24.453-22 51 30.692UCAC 22773548 0.0 15.1 86 3.0 3.048 3.383 1.66 179.0456 -22.858 -116.08 -6.82 19.9387 -0.03184 0.90202 16.20534 0.57575 -0.00525 -0.00031 2000 108.1024412008 224.00000 46.617718 86.039045 3.0895300.17076978 2.5541114 2.1179463 9.5 5.00.15 RATE 2.4145960 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.028 90 1.71 0.028 0 54523.5020080302_773548 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org