IOTA/IOTA-ES occultation update for (2115) Irakli / TYC 1305-00480-1 event on 2012 Nov 19, 19:38 UT Visible from Philippines, SE Asia, Africa Summary ------- On 2012 Nov 19 UT, the 23 km diameter asteroid (2115) Irakli will occult a 8.2 mag star in the constellation Taurus for observers along a path across Philippines, SE Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.6 mag to 15.8 mag (the magnitude of the asteroid) for at most 2.2 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: . The event at a glimpse ---------------------- * Rank: 22 * date and approx. time of event: 2012 Nov 19, 19:30 - 2012 Nov 19, 19:47 UT * geocentric midpoint of event [JD]: 2456251.3183625 * magnitude of target star: 8.2 * magnitude drop [mag]: 7.6 * estimated maximum duration [s]: 2.2 * Moon: 42 % sunlit, 125° distance * Sun: 154° distance * rough path description: Philippines, SE Asia, Africa The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 3.06 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .070 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .045", 94° ) * approx speed of asteroid's shadow [km/s]: 11.5340 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1305-00480-1 by 2115 Irakli on 2012 Nov 19 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 -25 43 52 19 47 32 0 68 -22 -25 36 25 .. .. .. -24 50 57 .. .. .. 8 0 0 -25 21 9 19 47 32 1 67 -23 -25 13 42 -25 28 36 -24 28 8 -26 14 19 9 0 0 -24 58 5 19 47 31 2 67 -24 -24 50 36 -25 5 33 -24 4 57 -25 51 21 10 0 0 -24 34 39 19 47 31 3 66 -25 -24 27 10 -24 42 9 -23 41 26 -25 28 2 11 0 0 -24 10 53 19 47 30 4 66 -26 -24 3 23 -24 18 23 -23 17 34 -25 4 22 12 0 0 -23 46 47 19 47 30 5 65 -27 -23 39 16 -23 54 18 -22 53 22 -24 40 21 13 0 0 -23 22 20 19 47 29 6 65 -28 -23 14 49 -23 29 52 -22 28 50 -24 16 0 14 0 0 -22 57 34 19 47 28 7 65 -28 -22 50 2 -23 5 7 -22 3 58 -23 51 20 15 0 0 -22 32 29 19 47 26 8 64 -29 -22 24 56 -22 40 2 -21 38 47 -23 26 20 16 0 0 -22 7 5 19 47 25 9 64 -30 -21 59 31 -22 14 39 -21 13 18 -23 1 1 17 0 0 -21 41 22 19 47 23 10 63 -31 -21 33 48 -21 48 57 -20 47 31 -22 35 24 18 0 0 -21 15 22 19 47 21 11 63 -32 -21 7 47 -21 22 57 -20 21 25 -22 9 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17 31 37 19 31 19 38 282 -13 17 38 31 17 24 44 18 20 37 16 42 30 147 0 0 17 26 19 19 31 14 37 283 -12 17 33 12 17 19 25 18 15 21 16 37 9 148 0 0 17 20 33 19 31 8 36 283 -11 17 27 27 17 13 39 18 9 38 16 31 22 149 0 0 17 14 22 19 31 3 35 283 -10 17 21 16 17 7 27 18 3 29 16 25 7 150 0 0 17 7 43 19 30 58 34 283 -9 17 14 38 17 0 49 17 56 53 16 18 26 151 0 0 17 0 38 19 30 52 33 283 -8 17 7 34 16 53 43 17 49 51 16 11 18 152 0 0 16 53 7 19 30 47 32 284 -7 17 0 2 16 46 11 17 42 23 16 3 43 153 0 0 16 45 8 19 30 43 31 284 -6 16 52 4 16 38 12 17 34 27 15 55 42 154 0 0 16 36 43 19 30 38 31 284 -5 16 43 39 16 29 46 17 26 5 15 47 13 155 0 0 16 27 51 19 30 33 30 284 -4 16 34 48 16 20 54 17 17 17 15 38 17 156 0 0 16 18 32 19 30 29 29 285 -3 16 25 29 16 11 34 17 8 2 15 28 55 157 0 0 16 8 46 19 30 24 28 285 -2 16 15 44 16 1 48 16 58 20 15 19 5 158 0 0 15 58 33 19 30 20 27 285 -2 16 5 32 15 51 34 16 48 11 15 8 48 159 0 0 15 47 53 19 30 16 26 285 -1 15 54 53 15 40 54 16 37 35 14 58 4 Uncertainty in time = +/- 10 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1305-00480-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 31 05.0436 DE: +20 11 21.003 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .024, .027 ) * V mag [mag]: 8.2 * B mag [mag]: 10.1 * Diameter [mas]: 1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2115) Irakli approx. diameter [km]: 23 approx. diameter ["]: .015 distance from Earth [AU]: 2.21200 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1081 number of rejected observations: 24 time covered by the observations: 1936 Apr 17 - 2012 Sep 19 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.036, 95° remarks: * orbital elements for (2115) Irakli : Mean anomaly = 222.73095129 deg Arg. of pericenter = 335.05522164 deg Long. of node = 241.49158767 deg Inclination = 8.98220443 deg Eccentricity = 0.04999506 Semimajor axis = 3.01758499 AU Perihelion dist = 2.86672065 AU Mag: H = 11.04, G = 0.15 Epoch of elements : MJD 56250.81900000 TDT (2012 Nov 19.819) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 19 2115 Irakli 19h 38.4m UT 8.2 5 31 5.044 20 11 21.00TYC 1305-00480-1 10.1 15.8 25 2.2 2.212 -1.747 -8.13 88.9259 20.191 -118.21 -19.69 19.6407 0.04866 -0.15028 -6.18082 -2.04431 -0.00256 0.00016 2000 222.57695920121119.00000335.055222241.491588 8.9822040.04999506 3.0175850 2.866720611.0 5.00.15 RATE 1.8802460 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.070 0.045 94 4.06 0.048 0 1-4 3 456247.0020121119_0480-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org