IOTA/IOTA-ES occultation update for (1149) Volga / TYC 1861-01414-1 event on 2009 Dec 08, 02:17 UT Visible from Summary ------- On 2009 Dec 08 UT, the 56 km diameter asteroid (1149) Volga will occult a 8.9 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 14.4 mag (the magnitude of the asteroid) for at most 4.4 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: 70 * date and approx. time of event: 2009 Dec 08, 02:09 - 2009 Dec 08, 02:25 UT * midpoint of event [JD]: 2455173.59544167 * magnitude of target star: 8.9 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 4.4 * Moon: 60 % sunlit, 69° distance * Sun: 171° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 0.84 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .032", 97° ) * approx speed of asteroid's shadow [km/s]: 12.6918 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1861-01414-1 by 1149 Volga on 2009 Dec 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 -118 0 0 - 0 1 12 2 25 22 0 67 -10 0 16 14 - 0 18 37 0 45 36 - 0 47 47 -117 0 0 0 25 10 2 25 21 1 67 -11 0 42 39 0 7 43 1 12 6 - 0 21 32 -116 0 0 0 51 58 2 25 21 3 67 -12 1 9 30 0 34 29 1 39 2 0 5 9 -115 0 0 1 19 13 2 25 21 4 67 -13 1 36 47 1 1 40 2 6 23 0 32 16 -114 0 0 1 46 52 2 25 20 5 67 -14 2 4 30 1 29 17 2 34 10 0 59 48 -113 0 0 2 14 57 2 25 19 6 67 -15 2 32 37 1 57 18 3 2 22 1 27 45 -112 0 0 2 43 25 2 25 18 7 67 -16 3 1 8 2 25 44 3 30 58 1 56 6 -111 0 0 3 12 17 2 25 16 8 67 -17 3 30 2 2 54 33 3 59 57 2 24 51 -110 0 0 3 41 31 2 25 15 9 67 -18 3 59 19 3 23 45 4 29 19 2 53 58 -109 0 0 4 11 8 2 25 13 10 67 -19 4 28 59 3 53 19 4 59 3 3 23 28 -108 0 0 4 41 6 2 25 11 11 67 -21 4 59 0 4 23 15 5 29 8 3 53 19 -107 0 0 5 11 25 2 25 9 12 67 -22 5 29 21 4 53 31 5 59 34 4 23 31 -106 0 0 5 42 4 2 25 7 14 67 -23 6 0 3 5 24 7 6 30 19 4 54 3 -105 0 0 6 13 2 2 25 4 15 67 -24 6 31 3 5 55 3 7 1 24 5 24 55 -104 0 0 6 44 18 2 25 2 16 68 -25 7 2 22 6 26 17 7 32 47 5 56 5 -103 0 0 7 15 52 2 24 59 17 68 -26 7 33 58 6 57 49 8 4 28 6 27 32 -102 0 0 7 47 43 2 24 56 18 68 -27 8 5 52 7 29 37 8 36 25 6 59 17 -101 0 0 8 19 50 2 24 52 19 68 -28 8 38 1 8 1 42 9 8 38 7 31 18 -100 0 0 8 52 12 2 24 49 20 68 -29 9 10 25 8 34 1 9 41 6 8 3 33 - 99 0 0 9 24 48 2 24 45 21 69 -30 9 43 3 9 6 35 10 13 47 8 36 4 - 98 0 0 9 57 37 2 24 41 22 69 -32 10 15 54 9 39 22 10 46 42 9 8 47 - 97 0 0 10 30 38 2 24 37 23 69 -33 10 48 57 10 12 21 11 19 49 9 41 43 - 96 0 0 11 3 51 2 24 33 25 69 -34 11 22 12 10 45 32 11 53 7 10 14 51 - 95 0 0 11 37 14 2 24 29 26 70 -35 11 55 37 11 18 53 12 26 35 10 48 9 - 94 0 0 12 10 47 2 24 24 27 70 -36 12 29 11 11 52 24 13 0 12 11 21 37 - 93 0 0 12 44 28 2 24 20 28 70 -37 13 2 54 12 26 3 13 33 58 11 55 13 - 92 0 0 13 18 16 2 24 15 29 70 -38 13 36 44 12 59 50 14 7 51 12 28 58 - 91 0 0 13 52 11 2 24 10 30 71 -39 14 10 41 13 33 44 14 41 50 13 2 49 - 90 0 0 14 26 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2 12 5 44 255 -37 49 1 39 48 29 35 49 28 39 48 2 44 25 0 0 48 42 38 2 12 0 43 256 -36 48 58 41 48 26 36 49 25 42 47 59 44 26 0 0 48 39 18 2 11 56 43 257 -36 48 55 21 48 23 16 49 22 24 47 56 23 27 0 0 48 35 36 2 11 52 42 258 -35 48 51 41 48 19 33 49 18 45 47 52 39 28 0 0 48 31 34 2 11 48 41 258 -34 48 47 39 48 15 30 49 14 44 47 48 34 29 0 0 48 27 9 2 11 44 41 259 -34 48 43 15 48 11 5 49 10 22 47 44 8 30 0 0 48 22 23 2 11 40 40 260 -33 48 38 30 48 6 18 49 5 39 47 39 19 31 0 0 48 17 16 2 11 36 40 261 -33 48 33 24 48 1 9 49 0 34 47 34 9 32 0 0 48 11 46 2 11 32 39 262 -32 48 27 55 47 55 39 48 55 7 47 28 36 33 0 0 48 5 55 2 11 28 38 263 -31 48 22 5 47 49 46 48 49 19 47 22 42 34 0 0 47 59 41 2 11 25 38 264 -31 48 15 53 47 43 31 48 43 9 47 16 25 35 0 0 47 53 6 2 11 21 37 265 -30 48 9 19 47 36 55 48 36 37 47 9 46 36 0 0 47 46 8 2 11 17 36 265 -29 48 2 23 47 29 55 48 29 43 47 2 45 37 0 0 47 38 48 2 11 13 36 266 -29 47 55 4 47 22 34 48 22 27 46 55 20 38 0 0 47 31 5 2 11 10 35 267 -28 47 47 23 47 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0 44 48 40 2 10 21 25 279 -17 45 5 28 44 31 54 45 33 45 44 3 47 54 0 0 44 34 36 2 10 18 24 280 -17 44 51 26 44 17 47 45 19 48 43 49 36 55 0 0 44 20 6 2 10 15 23 281 -16 44 36 59 44 3 15 45 5 25 43 35 0 56 0 0 44 5 12 2 10 12 22 281 -15 44 22 7 43 48 18 44 50 38 43 19 58 57 0 0 43 49 51 2 10 10 22 282 -14 44 6 49 43 32 55 44 35 24 43 4 31 58 0 0 43 34 5 2 10 7 21 283 -14 43 51 6 43 17 6 44 19 45 42 48 37 59 0 0 43 17 53 2 10 5 20 283 -13 43 34 56 43 0 51 44 3 40 42 32 18 60 0 0 43 1 14 2 10 2 19 284 -12 43 18 21 42 44 10 43 47 9 42 15 32 61 0 0 42 44 10 2 10 0 19 285 -11 43 1 19 42 27 2 43 30 12 41 58 20 62 0 0 42 26 39 2 9 57 18 286 -10 42 43 51 42 9 28 43 12 49 41 40 42 63 0 0 42 8 41 2 9 55 17 286 -10 42 25 56 41 51 28 42 54 59 41 22 37 64 0 0 41 50 17 2 9 53 16 287 -9 42 7 34 41 33 1 42 36 42 41 4 5 65 0 0 41 31 26 2 9 51 15 288 -8 41 48 46 41 14 7 42 17 59 40 45 6 66 0 0 41 12 8 2 9 49 15 288 -7 41 29 31 40 54 46 41 58 49 40 25 40 67 0 0 40 52 22 2 9 47 14 289 -6 41 9 49 40 34 58 41 39 12 40 5 47 68 0 0 40 32 10 2 9 45 13 290 -6 40 49 40 40 14 43 41 19 7 39 45 27 69 0 0 40 11 31 2 9 44 12 290 -5 40 29 3 39 54 0 40 58 36 39 24 40 70 0 0 39 50 24 2 9 42 11 291 -4 40 7 59 39 32 51 40 37 37 39 3 25 71 0 0 39 28 50 2 9 41 11 292 -3 39 46 28 39 11 13 40 16 11 38 41 43 72 0 0 39 6 48 2 9 39 10 292 -2 39 24 29 38 49 9 39 54 17 38 19 34 73 0 0 38 44 19 2 9 38 9 293 -1 39 2 3 38 26 37 39 31 56 37 56 57 74 0 0 38 21 23 2 9 37 8 293 -1 38 39 10 38 3 37 39 9 7 37 33 52 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1861-01414-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 39 09.2086 DE: +23 17 17.230 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .024, .026 ) * V mag [mag]: 8.9 * B mag [mag]: 9.3 * Apparent position with proper motion RA(deg): 84.9501538376 DE(deg): 23.2943089871 * Equation of equinoxes (radians) : 0.000067763337554 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1149) Volga approx. diameter [km]: 56 approx. diameter ["]: .043 distance from Earth [AU]: 1.79200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 711 number of rejected observations: 36 time covered by the observations: 1929 Aug 01 - 2007 Oct 04 1 sigma uncertainty ellipse (major, minor, PA): 0.045, 0.020, 99° remarks: * orbital elements for (1149) Volga : Mean anomaly = 56.83233659 deg Arg. of pericenter = 113.80404408 deg Long. of node = 261.73931835 deg Inclination = 11.74984032 deg Eccentricity = 0.09384312 Semimajor axis = 2.89827145 AU Perihelion dist = 2.62628860 AU Mag: H = 10.34, G = 0.15 Epoch of elements : MJD 55173.09600000 TDT (2009 Dec 08.096) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 8 1149 Volga 2h 17.4m UT 8.9 5 39 9.209 23 17 17.23TYC 1861-01414-1 9.3 14.4 56 4.4 1.792 -2.412 -11.51 -26.5507 23.292 143.59 -22.72 2.2906 -0.10599 0.30669 -6.76914 -2.34428 -0.00099 -0.00003 2000 56.213899200912 5.00000113.804044261.739318 11.7498400.09384312 2.8982715 2.626288610.6 5.00.15 RATE 1.9975400 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.032 97 1.84 0.036 0 54545.5020091208_1414-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 23:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org