IOTA/IOTA-ES occultation update for (3148) Grechko / TYC 1880-00717-1 event on 2008 Jan 03, 07:50 UT Visible from Caribbean, USA, Mexico Summary ------- On 2008 Jan 03 UT, the 51 km diameter asteroid (3148) Grechko will occult a 11.3 mag star in the constellation Gemini for observers along a path across Caribbean, USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 15.3 mag (the magnitude of the asteroid) for at most 4.6 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: 38 * date and approx. time of event: 2008 Jan 03, 07:40 - 2008 Jan 03, 07:59 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 4.6 * Moon: 23 % sunlit, 125° distance * Sun: 177° distance * rough path description: Caribbean, USA, Mexico The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 1.73 * 1 sigma uncertainty interval [seconds]: +/- 10.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .104 +/- .071) * 1 sigma uncertainty ellipse (major, minor, PA): ( .104", .071", 94° ) * approx speed of asteroid's shadow [km/s]: 11.1143 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1880-00717-1 by 3148 Grechko on 2008 Jan 03 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 145 0 0 7 56 28 7 59 36 0 66 3 8 11 42 7 41 14 9 4 27 .. .. .. 146 0 0 8 23 37 7 59 35 2 66 1 8 38 50 8 8 23 9 31 34 7 15 45 147 0 0 8 50 38 7 59 35 3 66 0 9 5 51 8 35 26 9 58 33 7 42 49 148 0 0 9 17 32 7 59 34 4 66 -1 9 32 45 9 2 20 10 25 24 8 9 46 149 0 0 9 44 17 7 59 34 5 66 -2 9 59 29 9 29 6 10 52 7 8 36 34 150 0 0 10 10 53 7 59 33 6 66 -3 10 26 5 9 55 43 11 18 40 9 3 13 151 0 0 10 37 20 7 59 31 7 67 -4 10 52 30 10 22 10 11 45 3 9 29 43 152 0 0 11 3 36 7 59 30 8 67 -5 11 18 45 10 48 26 12 11 15 9 56 2 153 0 0 11 29 41 7 59 28 9 67 -6 11 44 49 11 14 32 12 37 16 10 22 11 154 0 0 11 55 34 7 59 27 10 67 -7 12 10 42 11 40 26 13 3 6 10 48 8 155 0 0 12 21 15 7 59 25 11 67 -8 12 36 22 12 6 9 13 28 43 11 13 54 156 0 0 12 46 44 7 59 23 12 68 -9 13 1 50 12 31 39 13 54 7 11 39 27 157 0 0 13 12 0 7 59 20 13 68 -10 13 27 5 12 56 55 14 19 19 12 4 47 158 0 0 13 37 2 7 59 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7 47 7 40 34 5 294 -8 3 23 1 2 52 34 4 15 46 1 59 54 - 30 0 0 2 40 25 7 40 33 4 294 -6 2 55 39 2 25 12 3 48 23 1 32 33 - 29 0 0 2 13 5 7 40 33 3 294 -5 2 28 18 1 57 51 3 21 2 1 5 14 - 28 0 0 1 45 46 7 40 32 2 294 -4 2 1 0 1 30 33 2 53 42 0 37 56 - 27 0 0 1 18 31 7 40 32 0 294 -3 1 33 44 1 3 18 2 26 25 .. .. .. Data for the target star ------------------------ * name: TYC 1880-00717-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 40 48.4200 DE: +24 15 03.536 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .020 ) * V mag [mag]: 11.3 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3148) Grechko approx. diameter [km]: 51 approx. diameter ["]: .041 distance from Earth [AU]: 1.71600 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 781 number of rejected observations: 7 time covered by the observations: 1964 Jan 18 - 2007 Dec 17 1 sigma uncertainty ellipse (major, minor, PA): 0.100, 0.068, 94° remarks: * orbital elements for (3148) Grechko : Mean anomaly = 38.43724116 deg Arg. of pericenter = 44.49441721 deg Long. of node = 1.10275793 deg Inclination = 0.73450397 deg Eccentricity = 0.18954332 Semimajor axis = 3.10565475 AU Perihelion dist = 2.51699863 AU Mag: H = 12.15, G = 0.15 Epoch of elements : MJD 54468.32600000 TDT (2008 Jan 03.326) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 3148 Grechko 7h 50.1m UT 11.3 6 40 48.420 24 15 3.54TYC 1880-00717-1 11.7 15.3 51 4.6 1.716 -2.345 2.02 -119.636 24.251 63.53 -22.87 7.8344 .00530 .08435 -6.26076 0.39560 0.00027 -0.00013 2000 36.937864420071226.00000 44.494417 1.102758 0.7345040.189543323.105654752.5169986311.85 0.15 RATE 1.8008366 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.104 0.071 93.7 2.730 0.071 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 04:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org