IOTA/IOTA-ES occultation update for (1812) Gilgamesh / TYC 0175-00818-1 event on 2009 Jan 08, 17:03 UT Visible from Summary ------- On 2009 Jan 08 UT, the 19 km diameter asteroid (1812) Gilgamesh will occult a 10.0 mag star in the constellation Canis Minor for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.3 mag (the magnitude of the asteroid) for at most 1.6 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: 21 * date and approx. time of event: 2009 Jan 08, 16:55 - 2009 Jan 08, 17:12 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.6 * Moon: 91 % sunlit, 38° distance * Sun: 165° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 3.17 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .062 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .044", 94° ) * approx speed of asteroid's shadow [km/s]: 11.8560 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0175-00818-1 by 1812 Gilgamesh on 2009 Jan 8 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 7 0 0 33 15 25 17 12 2 0 81 -7 33 20 58 33 9 53 33 56 14 .. .. .. 8 0 0 33 23 6 17 12 2 1 82 -7 33 28 39 33 17 33 34 3 53 .. .. .. 9 0 0 33 30 33 17 12 2 2 82 -8 33 36 5 33 25 0 34 11 19 .. .. .. 10 0 0 33 37 46 17 12 1 3 83 -9 33 43 19 33 32 14 34 18 31 .. .. .. 11 0 0 33 44 47 17 12 1 4 84 -10 33 50 19 33 39 15 34 25 30 33 4 14 12 0 0 33 51 33 17 12 0 5 84 -11 33 57 5 33 46 1 34 32 15 33 11 2 13 0 0 33 58 6 17 11 59 5 85 -12 34 3 38 33 52 35 34 38 47 33 17 36 14 0 0 34 4 26 17 11 59 6 85 -12 34 9 58 33 58 55 34 45 6 33 23 57 15 0 0 34 10 32 17 11 58 7 86 -13 34 16 4 34 5 1 34 51 11 33 30 4 16 0 0 34 16 25 17 11 56 8 86 -14 34 21 56 34 10 54 34 57 2 33 35 58 17 0 0 34 22 4 17 11 55 9 87 -15 34 27 35 34 16 33 35 2 40 33 41 38 18 0 0 34 27 29 17 11 54 10 87 -16 34 33 0 34 21 58 35 8 4 33 47 4 19 0 0 34 32 40 17 11 53 10 88 -16 34 38 11 34 27 10 35 13 14 33 52 17 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28 -168 0 0 8 17 4 16 55 17 5 277 -9 8 22 37 8 11 30 8 57 55 7 36 23 -167 0 0 8 8 11 16 55 16 4 277 -8 8 13 44 8 2 38 8 49 1 .. .. .. -166 0 0 7 59 33 16 55 15 3 277 -7 8 5 6 7 54 0 8 40 22 .. .. .. -165 0 0 7 51 9 16 55 15 2 277 -6 7 56 42 7 45 36 8 31 56 .. .. .. -164 0 0 7 42 59 16 55 15 1 277 -5 7 48 32 7 37 27 8 23 46 .. .. .. Uncertainty in time = +/- 7 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 0175-00818-1 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 10 52.1961 DE: +07 26 10.582 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 10.0 * B mag [mag]: 10.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1812) Gilgamesh approx. diameter [km]: 19 approx. diameter ["]: .014 distance from Earth [AU]: 1.82000 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 833 number of rejected observations: 21 time covered by the observations: 1931 Jan 13 - 2008 Oct 25 1 sigma uncertainty ellipse (major, minor, PA): 0.058, 0.039, 94° remarks: * orbital elements for (1812) Gilgamesh : Mean anomaly = 20.90357312 deg Arg. of pericenter = 264.69296997 deg Long. of node = 178.72225237 deg Inclination = 10.25950114 deg Eccentricity = 0.08143114 Semimajor axis = 3.00765260 AU Perihelion dist = 2.76273603 AU Mag: H = 11.40, G = 0.15 Epoch of elements : MJD 54839.71100000 TDT (2009 Jan 08.711) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 8 1812 Gilgamesh 17h 3.6m UT 10.0 7 10 52.196 7 26 10.58TYC 0175-00818-1 10.4 15.3 19 1.6 1.820 -2.120 7.19 103.4266 7.435 -74.19 -22.15 17.0607 0.07783 0.34112 -6.52451 1.48712 0.00024 0.00150 2000 19.06861320081230.00000264.692970178.722252 10.2595010.08143114 3.0076526 2.762736011.3 5.00.15 RATE 1.8895690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.044 94 4.17 0.046 0 54774.5020090108_0818-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org