IOTA/IOTA-ES occultation update for (568) Cheruskia / TYC 1172-01134-1 event on 2009 Jan 05, 01:17 UT Visible from Summary ------- On 2009 Jan 05 UT, the 87 km diameter asteroid (568) Cheruskia will occult a 10.2 mag star in the constellation Pegasus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 14.2 mag (the magnitude of the asteroid) for at most 3.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 93 * date and approx. time of event: 2009 Jan 05, 01:18 - 2009 Jan 05, 01:21 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 3.2 * Moon: 56 % sunlit, 25° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 91 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .021", 85° ) * approx speed of asteroid's shadow [km/s]: 27.5938 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1172-01134-1 by 568 Cheruskia on 2009 Jan 5 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 -122 0 0 30 17 9 1 18 18 70 207 0 29 52 25 30 41 56 29 29 13 31 5 18 -121 0 0 30 19 29 1 18 21 69 209 -1 29 54 45 30 44 16 29 31 33 31 7 37 -120 0 0 30 21 36 1 18 24 69 212 -2 29 56 52 30 46 23 29 33 41 31 9 44 -119 0 0 30 23 30 1 18 28 68 214 -3 29 58 47 30 48 17 29 35 36 31 11 37 -118 0 0 30 25 12 1 18 31 68 216 -3 30 0 29 30 49 58 29 37 17 31 13 19 -117 0 0 30 26 40 1 18 35 67 219 -4 30 1 57 30 51 27 29 38 46 31 14 47 -116 0 0 30 27 56 1 18 38 67 221 -5 30 3 13 30 52 42 29 40 3 31 16 2 -115 0 0 30 28 59 1 18 42 66 223 -6 30 4 16 30 53 45 29 41 6 31 17 5 -114 0 0 30 29 49 1 18 45 66 225 -7 30 5 7 30 54 35 29 41 56 31 17 55 -113 0 0 30 30 26 1 18 48 65 226 -7 30 5 44 30 55 12 29 42 33 31 18 32 -112 0 0 30 30 51 1 18 52 64 228 -8 30 6 8 30 55 36 29 42 58 31 18 56 -111 0 0 30 31 2 1 18 55 64 230 -9 30 6 20 30 55 48 29 43 9 31 19 8 -110 0 0 30 31 1 1 18 58 63 231 -10 30 6 18 30 55 47 29 43 8 31 19 6 -109 0 0 30 30 46 1 19 2 62 233 -11 30 6 4 30 55 32 29 42 53 31 18 52 -108 0 0 30 30 19 1 19 5 62 234 -12 30 5 37 30 55 5 29 42 26 31 18 25 -107 0 0 30 29 39 1 19 8 61 236 -12 30 4 57 30 54 25 29 41 46 31 17 45 -106 0 0 30 28 46 1 19 11 60 237 -13 30 4 4 30 53 33 29 40 53 31 16 53 -105 0 0 30 27 41 1 19 15 59 239 -14 30 2 58 30 52 27 29 39 47 31 15 47 -104 0 0 30 26 22 1 19 18 59 240 -15 30 1 39 30 51 9 29 38 28 31 14 29 -103 0 0 30 24 51 1 19 21 58 241 -16 30 0 8 30 49 38 29 36 56 31 12 58 -102 0 0 30 23 7 1 19 24 57 242 -16 29 58 23 30 47 54 29 35 12 31 11 14 -101 0 0 30 21 10 1 19 27 56 244 -17 29 56 26 30 45 57 29 33 14 31 9 18 -100 0 0 30 19 0 1 19 30 56 245 -18 29 54 16 30 43 48 29 31 4 31 7 9 - 99 0 0 30 16 38 1 19 33 55 246 -19 29 51 54 30 41 26 29 28 41 31 4 47 - 98 0 0 30 14 3 1 19 36 54 247 -20 29 49 18 30 38 51 29 26 6 31 2 13 - 97 0 0 30 11 15 1 19 39 53 248 -21 29 46 30 30 36 4 29 23 17 30 59 26 - 96 0 0 30 8 15 1 19 42 52 249 -21 29 43 30 30 33 4 29 20 16 30 56 26 - 95 0 0 30 5 2 1 19 45 52 250 -22 29 40 16 30 29 51 29 17 3 30 53 14 - 94 0 0 30 1 37 1 19 48 51 251 -23 29 36 50 30 26 26 29 13 36 30 49 50 - 93 0 0 29 57 59 1 19 51 50 252 -24 29 33 12 30 22 49 29 9 58 30 46 12 - 92 0 0 29 54 8 1 19 54 49 253 -25 29 29 21 30 18 59 29 6 6 30 42 23 - 91 0 0 29 50 5 1 19 57 48 253 -26 29 25 18 30 14 56 29 2 2 30 38 21 - 90 0 0 29 45 50 1 19 59 48 254 -27 29 21 2 30 10 41 28 57 46 30 34 7 - 89 0 0 29 41 22 1 20 2 47 255 -27 29 16 34 30 6 14 28 53 18 30 29 40 - 88 0 0 29 36 42 1 20 5 46 256 -28 29 11 53 30 1 35 28 48 37 30 25 1 - 87 0 0 29 31 50 1 20 8 45 257 -29 29 7 1 29 56 43 28 43 43 30 20 10 - 86 0 0 29 26 46 1 20 10 44 257 -30 29 1 56 29 51 39 28 38 38 30 15 7 - 85 0 0 29 21 29 1 20 13 43 258 -31 28 56 39 29 46 24 28 33 20 30 9 51 - 84 0 0 29 16 1 1 20 15 43 259 -32 28 51 9 29 40 56 28 27 50 30 4 24 - 83 0 0 29 10 20 1 20 18 42 260 -32 28 45 28 29 35 16 28 22 9 29 58 45 - 82 0 0 29 4 28 1 20 20 41 260 -33 28 39 35 29 29 24 28 16 15 29 52 54 - 81 0 0 28 58 24 1 20 23 40 261 -34 28 33 30 29 23 20 28 10 9 29 46 51 - 80 0 0 28 52 8 1 20 25 39 262 -35 28 27 13 29 17 5 28 3 52 29 40 36 - 79 0 0 28 45 40 1 20 28 38 262 -36 28 20 45 29 10 38 27 57 23 29 34 9 - 78 0 0 28 39 0 1 20 30 37 263 -37 28 14 5 29 3 59 27 50 42 29 27 31 - 77 0 0 28 32 9 1 20 32 37 264 -38 28 7 13 28 57 9 27 43 50 29 20 42 - 76 0 0 28 25 7 1 20 34 36 264 -38 28 0 10 28 50 7 27 36 46 29 13 41 - 75 0 0 28 17 53 1 20 37 35 265 -39 27 52 56 28 42 54 27 29 31 29 6 29 - 74 0 0 28 10 28 1 20 39 34 266 -40 27 45 30 28 35 30 27 22 5 28 59 5 - 73 0 0 28 2 52 1 20 41 33 266 -41 27 37 53 28 27 55 27 14 27 28 51 30 - 72 0 0 27 55 5 1 20 43 32 267 -42 27 30 5 28 20 8 27 6 38 28 43 44 - 71 0 0 27 47 7 1 20 45 31 267 -43 27 22 6 28 12 11 26 58 39 28 35 48 - 70 0 0 27 38 58 1 20 47 30 268 -44 27 13 56 28 4 2 26 50 28 28 27 40 - 69 0 0 27 30 38 1 20 49 30 268 -45 27 5 36 27 55 43 26 42 7 28 19 22 - 68 0 0 27 22 7 1 20 51 29 269 -45 26 57 4 27 47 14 26 33 35 28 10 53 - 67 0 0 27 13 26 1 20 52 28 270 -46 26 48 23 27 38 33 26 24 52 28 2 13 - 66 0 0 27 4 35 1 20 54 27 270 -47 26 39 31 27 29 43 26 16 0 27 53 24 - 65 0 0 26 55 33 1 20 56 26 271 -48 26 30 28 27 20 42 26 6 57 27 44 24 - 64 0 0 26 46 22 1 20 58 25 271 -49 26 21 16 27 11 31 25 57 43 27 35 13 - 63 0 0 26 37 0 1 20 59 24 272 -50 26 11 53 27 2 10 25 48 20 27 25 53 - 62 0 0 26 27 28 1 21 1 23 272 -51 26 2 21 26 52 39 25 38 47 27 16 23 - 61 0 0 26 17 47 1 21 2 22 273 -52 25 52 39 26 42 59 25 29 4 27 6 43 - 60 0 0 26 7 56 1 21 4 21 273 -53 25 42 47 26 33 9 25 19 12 26 56 54 - 59 0 0 25 57 56 1 21 5 20 274 -53 25 32 46 26 23 9 25 9 10 26 46 55 - 58 0 0 25 47 46 1 21 6 20 274 -54 25 22 36 26 13 1 24 58 59 26 36 47 - 57 0 0 25 37 28 1 21 8 19 275 -55 25 12 17 26 2 43 24 48 39 26 26 30 - 56 0 0 25 27 0 1 21 9 18 275 -56 25 1 48 25 52 16 24 38 10 26 16 4 - 55 0 0 25 16 24 1 21 10 17 275 -57 24 51 11 25 41 40 24 27 32 26 5 29 - 54 0 0 25 5 39 1 21 11 16 276 -58 24 40 26 25 30 56 24 16 46 25 54 45 - 53 0 0 24 54 46 1 21 12 15 276 -59 24 29 31 25 20 3 24 5 51 25 43 53 - 52 0 0 24 43 44 1 21 13 14 277 -60 24 18 29 25 9 2 23 54 48 25 32 53 - 51 0 0 24 32 34 1 21 14 13 277 -61 24 7 19 24 57 53 23 43 37 25 21 45 - 50 0 0 24 21 17 1 21 15 12 278 -61 23 56 0 24 46 36 23 32 18 25 10 28 - 49 0 0 24 9 51 1 21 16 11 278 -62 23 44 34 24 35 12 23 20 52 24 59 4 - 48 0 0 23 58 18 1 21 17 10 279 -63 23 33 1 24 23 39 23 9 18 24 47 33 - 47 0 0 23 46 38 1 21 17 9 279 -64 23 21 20 24 12 0 22 57 37 24 35 54 - 46 0 0 23 34 51 1 21 18 8 279 -65 23 9 32 24 0 13 22 45 48 24 24 8 - 45 0 0 23 22 57 1 21 18 8 280 -66 22 57 38 23 48 20 22 33 53 24 12 15 - 44 0 0 23 10 56 1 21 19 7 280 -67 22 45 36 23 36 20 22 21 51 24 0 15 - 43 0 0 22 58 49 1 21 19 6 281 -68 22 33 29 23 24 13 22 9 43 23 48 9 - 42 0 0 22 46 35 1 21 20 5 281 -69 22 21 15 23 12 0 21 57 28 23 35 56 - 41 0 0 22 34 16 1 21 20 4 281 -70 22 8 55 22 59 41 21 45 8 23 23 38 - 40 0 0 22 21 50 1 21 20 3 282 -71 21 56 29 22 47 16 21 32 41 23 11 13 - 39 0 0 22 9 20 1 21 20 2 282 -71 21 43 57 22 34 45 21 20 10 22 58 43 - 38 0 0 21 56 43 1 21 21 1 282 -72 21 31 20 22 22 10 21 7 32 22 46 8 Uncertainty in time = +/- 2 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 1172-01134-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 32 35.8511 DE: +11 49 04.264 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 10.2 * B mag [mag]: 10.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (568) Cheruskia approx. diameter [km]: 87 approx. diameter ["]: .046 distance from Earth [AU]: 2.58800 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 791 number of rejected observations: 51 time covered by the observations: 1915 Sep 13 - 2008 Oct 02 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 77° remarks: * orbital elements for (568) Cheruskia : Mean anomaly = 327.87056181 deg Arg. of pericenter = 174.16121846 deg Long. of node = 249.93072186 deg Inclination = 18.38879294 deg Eccentricity = 0.16550463 Semimajor axis = 2.88286124 AU Perihelion dist = 2.40573435 AU Mag: H = 9.37, G = 0.15 Epoch of elements : MJD 54836.05400000 TDT (2009 Jan 05.054) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 5 568 Cheruskia 1h 17.7m UT 10.2 23 32 35.851 11 49 4.26TYC 1172-01134-1 10.6 14.2 87 3.2 2.588 3.594 4.09 -131.0429 11.817 161.91 -22.61 1.2945 -0.02457 0.30264 15.52818 1.20269 0.00497 0.00263 2000 326.65154220081230.00000174.161218249.930722 18.3887930.16550463 2.8828612 2.4057344 9.1 5.00.15 RATE 2.0135780 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.024 0.021 85 1.47 0.022 0 54774.5020090105_1134-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org