IOTA/IOTA-ES occultation update for (1692) Subbotina / TYC 1343-00620-1 event on 2008 May 10, 20:01 UT Visible from Spain, N Africa Summary ------- On 2008 May 10 UT, the 41 km diameter asteroid (1692) Subbotina will occult a 9.2 mag star in the constellation Gemini for observers along a path across Spain, N Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.0 mag to 17.2 mag (the magnitude of the asteroid) for at most 1.2 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: UCAC. The event at a glimpse ---------------------- * Rank: 41 * date and approx. time of event: 2008 May 10, 20:03 - 2008 May 10, 20:04 UT * midpoint of event [JD]: 2454597.33436667 * magnitude of target star: 9.2 * magnitude drop [mag]: 8.0 * estimated maximum duration [s]: 1.2 * Moon: 36 % sunlit, 21° distance * Sun: 53° distance * rough path description: Spain, N Africa The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 1.60 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .024", 92° ) * approx speed of asteroid's shadow [km/s]: 32.8911 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1343-00620-1 by 1692 Subbotina on 2008 May 10 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 - 14 0 0 42 38 25 20 3 15 42 260 0 42 24 30 42 52 23 41 40 10 43 37 18 - 13 0 0 42 20 14 20 3 17 41 261 -1 42 6 17 42 34 13 41 21 53 43 19 12 - 12 0 0 42 1 46 20 3 19 40 262 -2 41 47 48 42 15 46 41 3 21 43 0 50 - 11 0 0 41 43 2 20 3 21 40 263 -3 41 29 3 41 57 4 40 44 32 42 42 11 - 10 0 0 41 24 3 20 3 23 39 264 -4 41 10 2 41 38 5 40 25 27 42 23 17 - 9 0 0 41 4 48 20 3 25 38 265 -4 40 50 46 41 18 52 40 6 8 42 4 7 - 8 0 0 40 45 18 20 3 27 37 266 -5 40 31 15 40 59 22 39 46 33 41 44 41 - 7 0 0 40 25 32 20 3 29 37 267 -6 40 11 29 40 39 38 39 26 43 41 25 1 - 6 0 0 40 5 32 20 3 31 36 268 -7 39 51 28 40 19 39 39 6 39 41 5 5 - 5 0 0 39 45 18 20 3 33 35 269 -8 39 31 12 39 59 26 38 46 20 40 44 55 - 4 0 0 39 24 50 20 3 35 34 270 -9 39 10 43 39 38 59 38 25 48 40 24 31 - 3 0 0 39 4 7 20 3 37 34 271 -9 38 50 0 39 18 17 38 5 2 40 3 52 - 2 0 0 38 43 12 20 3 38 33 271 -10 38 29 3 38 57 23 37 44 3 39 43 0 - 1 0 0 38 22 3 20 3 40 32 272 -11 38 7 54 38 36 15 37 22 51 39 21 55 0 0 0 38 0 42 20 3 42 31 273 -12 37 46 32 38 14 54 37 1 27 39 0 37 1 0 0 37 39 9 20 3 44 30 274 -13 37 24 58 37 53 22 36 39 50 38 39 7 2 0 0 37 17 23 20 3 46 30 275 -14 37 3 12 37 31 37 36 18 2 38 17 24 3 0 0 36 55 27 20 3 47 29 275 -15 36 41 15 37 9 41 35 56 3 37 55 30 4 0 0 36 33 19 20 3 49 28 276 -15 36 19 6 36 47 34 35 33 53 37 33 25 5 0 0 36 11 1 20 3 51 27 277 -16 35 56 48 36 25 16 35 11 33 37 11 9 6 0 0 35 48 32 20 3 52 26 278 -17 35 34 19 36 2 48 34 49 3 36 48 43 7 0 0 35 25 55 20 3 54 25 278 -18 35 11 41 35 40 11 34 26 23 36 26 6 8 0 0 35 3 8 20 3 55 25 279 -19 34 48 54 35 17 24 34 3 35 36 3 21 9 0 0 34 40 12 20 3 57 24 280 -20 34 25 58 34 54 29 33 40 39 35 40 27 10 0 0 34 17 9 20 3 58 23 280 -21 34 2 54 34 31 26 33 17 34 35 17 24 11 0 0 33 53 58 20 4 0 22 281 -22 33 39 43 34 8 15 32 54 23 34 54 14 12 0 0 33 30 40 20 4 1 21 282 -22 33 16 25 33 44 58 32 31 5 34 30 57 13 0 0 33 7 16 20 4 2 20 282 -23 32 53 1 33 21 34 32 7 41 34 7 33 14 0 0 32 43 46 20 4 3 19 283 -24 32 29 31 32 58 4 31 44 11 33 44 3 15 0 0 32 20 11 20 4 5 18 283 -25 32 5 56 32 34 28 31 20 36 33 20 27 16 0 0 31 56 32 20 4 6 17 284 -26 31 42 17 32 10 49 30 56 57 32 56 47 17 0 0 31 32 48 20 4 7 16 285 -27 31 18 33 31 47 5 30 33 14 32 33 2 18 0 0 31 9 1 20 4 8 15 285 -28 30 54 46 31 23 17 30 9 28 32 9 14 19 0 0 30 45 11 20 4 9 15 286 -29 30 30 57 30 59 27 29 45 39 31 45 23 20 0 0 30 21 19 20 4 10 14 286 -30 30 7 5 30 35 35 29 21 49 31 21 29 21 0 0 29 57 25 20 4 11 13 287 -30 29 43 12 30 11 40 28 57 57 30 57 34 22 0 0 29 33 30 20 4 11 12 287 -31 29 19 18 29 47 45 28 34 4 30 33 37 23 0 0 29 9 36 20 4 12 11 288 -32 28 55 23 29 23 50 28 10 12 30 9 40 24 0 0 28 45 41 20 4 13 10 288 -33 28 31 30 28 59 55 27 46 19 29 45 43 25 0 0 28 21 48 20 4 13 9 289 -34 28 7 37 28 36 1 27 22 29 29 21 47 26 0 0 27 57 56 20 4 14 8 289 -35 27 43 45 28 12 8 26 58 40 28 57 52 27 0 0 27 34 6 20 4 14 7 290 -36 27 19 57 27 48 18 26 34 53 28 33 59 28 0 0 27 10 19 20 4 15 6 290 -36 26 56 11 27 24 30 26 11 10 28 10 9 29 0 0 26 46 36 20 4 15 5 291 -37 26 32 28 27 0 46 25 47 30 27 46 22 30 0 0 26 22 57 20 4 16 4 291 -38 26 8 50 26 37 7 .. .. .. 27 22 40 31 0 0 25 59 23 20 4 16 3 292 -39 25 45 17 26 13 32 .. .. .. 26 59 2 32 0 0 25 35 55 20 4 16 2 292 -40 25 21 49 25 50 2 .. .. .. 26 35 29 33 0 0 25 12 32 20 4 16 1 292 -41 24 58 28 25 26 38 .. .. .. 26 12 2 34 0 0 24 49 16 20 4 16 0 293 -41 .. .. .. 25 3 21 .. .. .. 25 48 42 Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 31.0] Data for the target star ------------------------ * name: TYC 1343-00620-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 55 50.9690 DE: +20 44 32.149 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 9.2 * B mag [mag]: 10.2 * Apparent position with proper motion RA(deg): 104.0858536935 DE(deg): 20.7328489442 * Equation of equinoxes (radians) : 0.000041095577027 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1692) Subbotina approx. diameter [km]: 41 approx. diameter ["]: .015 distance from Earth [AU]: 3.65700 * orbital information: orbit source: Preston date of fit: 2008 Mar 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1080 number of rejected observations: 42 time covered by the observations: 1931 Jul 24 - 2008 Feb 07 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.013, 95° remarks: * orbital elements for (1692) Subbotina : Mean anomaly = 161.21204125 deg Arg. of pericenter = 112.61811659 deg Long. of node = 199.72786647 deg Inclination = 2.42413763 deg Eccentricity = 0.13438409 Semimajor axis = 2.78943634 AU Perihelion dist = 2.41458048 AU Mag: H = 11.25, G = 0.15 Epoch of elements : MJD 54596.83400000 TDT (2008 May 10.834) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 10 1692 Subbotina 20h 1.5m UT 9.2 6 55 50.969 20 44 32.15TYC 1343-00620-1 10.2 17.2 41 1.2 3.657 3.175 -3.21 -65.3984 20.743 -121.27 17.88 20.0248 0.03641 0.50771 18.51665 -1.33440 0.00449 -0.00056 2000 159.7662542008 5 4.00000112.618117199.727866 2.4241380.13438409 2.7894363 2.414580511.1 5.00.15 RATE 2.1155800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.024 92 2.60 0.024 0 54556.5020080510_0620-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org