IOTA/IOTA-ES occultation update for (671) Carnegia / TYC 1917-00882-1 event on 2008 May 20, 15:53 UT Visible from Africa Summary ------- On 2008 May 20 UT, the 59 km diameter asteroid (671) Carnegia will occult a 11.5 mag star in the constellation Gemini for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 15.9 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: 43 * date and approx. time of event: 2008 May 20, 15:55 - 2008 May 20, 15:56 UT * midpoint of event [JD]: 2454607.16240833 * magnitude of target star: 11.5 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 1.6 * Moon: 100 % sunlit, 139° distance * Sun: 47° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 1.51 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .026", 2° ) * approx speed of asteroid's shadow [km/s]: 37.3798 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1917-00882-1 by 671 Carnegia on 2008 May 20 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 29 0 0 - 4 0 49 15 55 48 42 314 0 - 4 19 49 - 3 41 52 - 5 17 26 - 2 44 49 30 0 0 - 4 33 9 15 55 51 41 314 -1 - 4 52 11 - 4 14 8 - 5 49 57 - 3 16 56 31 0 0 - 5 5 48 15 55 53 40 313 -3 - 5 24 54 - 4 46 45 - 6 22 48 - 3 49 25 32 0 0 - 5 38 48 15 55 55 39 313 -4 - 5 57 57 - 5 19 42 - 6 55 59 - 4 22 13 33 0 0 - 6 12 7 15 55 57 38 313 -5 - 6 31 18 - 5 52 58 - 7 29 29 - 4 55 21 34 0 0 - 6 45 44 15 56 0 36 312 -6 - 7 4 58 - 6 26 32 - 8 3 17 - 5 28 47 35 0 0 - 7 19 38 15 56 2 35 312 -7 - 7 38 54 - 7 0 23 - 8 37 21 - 6 2 31 36 0 0 - 7 53 48 15 56 4 34 312 -8 - 8 13 7 - 7 34 31 - 9 11 41 - 6 36 31 37 0 0 - 8 28 13 15 56 6 33 312 -9 - 8 47 34 - 8 8 54 - 9 46 16 - 7 10 46 38 0 0 - 9 2 52 15 56 8 32 311 -10 - 9 22 16 - 8 43 30 -10 21 5 - 7 45 16 39 0 0 - 9 37 44 15 56 10 31 311 -12 - 9 57 10 - 9 18 20 -10 56 6 - 8 20 0 40 0 0 -10 12 48 15 56 11 30 311 -13 -10 32 16 - 9 53 22 -11 31 19 - 8 54 55 41 0 0 -10 48 3 15 56 13 29 310 -14 -11 7 33 -10 28 35 -12 6 42 - 9 30 2 42 0 0 -11 23 27 15 56 15 27 310 -15 -11 42 59 -11 3 58 -12 42 14 -10 5 19 43 0 0 -11 59 0 15 56 16 26 310 -16 -12 18 34 -11 39 29 -13 17 54 -10 40 45 44 0 0 -12 34 41 15 56 18 25 309 -17 -12 54 16 -12 15 8 -13 53 41 -11 16 19 45 0 0 -13 10 28 15 56 19 24 309 -18 -13 30 5 -12 50 53 -14 29 34 -11 51 59 46 0 0 -13 46 19 15 56 21 23 309 -19 -14 5 58 -13 26 43 -15 5 32 -12 27 45 47 0 0 -14 22 15 15 56 22 22 309 -20 -14 41 55 -14 2 38 -15 41 33 -13 3 36 48 0 0 -14 58 13 15 56 23 21 308 -22 -15 17 54 -14 38 35 -16 17 36 -13 39 30 49 0 0 -15 34 13 15 56 25 20 308 -23 -15 53 55 -15 14 34 -16 53 40 -14 15 25 50 0 0 -16 10 13 15 56 26 18 308 -24 -16 29 56 -15 50 33 -17 29 43 -14 51 22 51 0 0 -16 46 13 15 56 27 17 307 -25 -17 5 56 -16 26 31 -18 5 46 -15 27 18 52 0 0 -17 22 10 15 56 28 16 307 -26 -17 41 54 -17 2 28 -18 41 46 -16 3 13 53 0 0 -17 58 4 15 56 29 15 307 -27 -18 17 49 -17 38 22 -19 17 42 -16 39 5 54 0 0 -18 33 54 15 56 30 14 306 -28 -18 53 39 -18 14 11 -19 53 33 -17 14 54 55 0 0 -19 9 38 15 56 31 13 306 -29 -19 29 23 -18 49 55 -20 29 18 -17 50 37 56 0 0 -19 45 16 15 56 31 12 306 -30 -20 5 1 -19 25 33 -21 4 56 -18 26 15 57 0 0 -20 20 45 15 56 32 11 305 -31 -20 40 30 -20 1 3 -21 40 25 -19 1 45 58 0 0 -20 56 6 15 56 33 9 305 -32 -21 15 51 -20 36 24 -22 15 45 -19 37 7 59 0 0 -21 31 17 15 56 33 8 305 -33 -21 51 2 -21 11 35 -22 50 54 -20 12 19 60 0 0 -22 6 17 15 56 34 7 304 -34 -22 26 1 -21 46 36 -23 25 52 -20 47 21 61 0 0 -22 41 5 15 56 34 6 304 -35 -23 0 49 -22 21 24 -24 0 38 -21 22 12 62 0 0 -23 15 40 15 56 34 5 303 -36 -23 35 23 -22 56 0 -24 35 9 -21 56 50 63 0 0 -23 50 1 15 56 35 4 303 -37 -24 9 43 -23 30 22 -25 9 26 -22 31 14 64 0 0 -24 24 7 15 56 35 3 303 -38 -24 43 48 -24 4 29 -25 43 28 -23 5 25 65 0 0 -24 57 57 15 56 35 2 302 -39 -25 17 36 -24 38 20 -26 17 13 -23 39 19 66 0 0 -25 31 30 15 56 35 1 302 -40 -25 51 8 -25 11 55 -26 50 41 -24 12 58 Uncertainty in time = +/- 2 secs [Prediction of 2008 Apr 9.0] Data for the target star ------------------------ * name: TYC 1917-00882-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 17 19.5902 DE: +28 01 06.304 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .032 ) * V mag [mag]: 11.5 * B mag [mag]: 12.0 * Apparent position with proper motion RA(deg): 109.4614229968 DE(deg): 28.0053227281 * Equation of equinoxes (radians) : 0.000039963922054 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (671) Carnegia approx. diameter [km]: 59 approx. diameter ["]: .023 distance from Earth [AU]: 3.48800 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 801 number of rejected observations: 70 time covered by the observations: 1914 Nov 09 - 2008 Mar 07 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.014, 102° remarks: * orbital elements for (671) Carnegia : Mean anomaly = 22.74195509 deg Arg. of pericenter = 95.01755233 deg Long. of node = 0.75387086 deg Inclination = 8.03399123 deg Eccentricity = 0.06780859 Semimajor axis = 3.09303476 AU Perihelion dist = 2.88330042 AU Mag: H = 10.17, G = 0.15 Epoch of elements : MJD 54606.66200000 TDT (2008 May 20.662) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 20 671 Carnegia 15h 53.9m UT 11.5 7 17 19.590 28 1 6.30TYC 1917-00882-1 12.0 15.9 59 1.6 3.488 3.925 -11.26 -7.8103 28.021 -59.32 20.15 15.8978 -0.06322 -0.29049 20.62045 -4.46446 0.00413 -0.00017 2000 21.5348882008 514.00000 95.017552 0.753871 8.0339910.06780859 3.0930348 2.883300410.0 5.00.15 RATE 1.8118690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.026 2 2.51 0.035 0 54565.5020080520_0882-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org