IOTA/IOTA-ES occultation update for (1252) Celestia / TYC 1388-01672-1 event on 2008 Apr 01, 16:42 UT Visible from Russia Summary ------- On 2008 Apr 01 UT, the 17 km diameter asteroid (1252) Celestia will occult a 10.3 mag star in the constellation Cancer for observers along a path across Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.4 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: UCAC. The event at a glimpse ---------------------- * Rank: 28 * date and approx. time of event: 2008 Apr 01, 16:41 - 2008 Apr 01, 16:51 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 1.4 * Moon: 24 % sunlit, 164° distance * Sun: 106° distance * rough path description: Russia The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 2.36 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .026", 66° ) * approx speed of asteroid's shadow [km/s]: 12.2778 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1388-01672-1 by 1252 Celestia on 2008 Apr 1 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 23 0 0 19 6 19 16 41 7 74 79 -1 18 57 16 19 15 24 18 14 37 19 58 19 24 0 0 20 39 45 16 41 23 75 84 -1 20 30 42 20 48 49 19 48 3 21 31 44 25 0 0 22 12 11 16 41 40 76 90 -2 22 3 8 22 21 15 21 20 33 23 4 6 26 0 0 23 43 26 16 41 56 77 97 -3 23 34 25 23 52 28 22 51 54 24 35 14 27 0 0 25 13 21 16 42 12 78 106 -4 25 4 21 25 22 21 24 21 58 26 4 59 28 0 0 26 41 45 16 42 28 78 114 -5 26 32 48 26 50 44 25 50 35 27 33 11 29 0 0 28 8 32 16 42 43 78 123 -5 27 59 37 28 17 27 27 17 37 28 59 42 30 0 0 29 33 33 16 42 59 78 132 -6 29 24 41 29 42 25 28 42 55 30 24 24 31 0 0 30 56 42 16 43 14 78 140 -7 30 47 53 31 5 31 30 6 24 31 47 13 32 0 0 32 17 53 16 43 28 77 148 -7 32 9 9 32 26 39 31 27 58 33 8 2 33 0 0 33 37 4 16 43 43 77 155 -8 33 28 23 33 45 44 32 47 32 34 26 48 34 0 0 34 54 8 16 43 57 76 161 -9 34 45 33 35 2 45 34 5 3 35 43 27 35 0 0 36 9 6 16 44 10 75 166 -9 36 0 34 36 17 37 35 20 27 36 57 56 36 0 0 37 21 53 16 44 23 74 170 -10 37 13 27 37 30 19 36 33 44 38 10 14 37 0 0 38 32 30 16 44 36 73 174 -10 38 24 9 38 40 51 37 44 50 39 20 21 38 0 0 39 40 56 16 44 48 72 178 -11 39 32 41 39 49 12 38 53 47 40 28 16 39 0 0 40 47 12 16 45 0 71 181 -11 40 39 2 40 55 22 40 0 35 41 34 0 40 0 0 41 51 18 16 45 12 69 184 -12 41 43 14 41 59 23 41 5 13 42 37 34 41 0 0 42 53 16 16 45 23 68 186 -12 42 45 18 43 1 15 42 7 44 43 38 59 42 0 0 43 53 8 16 45 34 67 188 -12 43 45 16 44 1 1 43 8 9 44 38 18 43 0 0 44 50 56 16 45 44 66 191 -13 44 43 10 44 58 44 44 6 29 45 35 33 44 0 0 45 46 43 16 45 54 65 192 -13 45 39 2 45 54 24 45 2 49 46 30 46 45 0 0 46 40 31 16 46 4 64 194 -14 46 32 55 46 48 6 45 57 10 47 24 0 46 0 0 47 32 23 16 46 13 63 196 -14 47 24 53 47 39 53 46 49 35 48 15 19 47 0 0 48 22 22 16 46 22 62 198 -14 48 14 58 48 29 46 47 40 6 49 4 46 48 0 0 49 10 32 16 46 30 61 199 -14 49 3 14 49 17 50 48 28 49 49 52 23 49 0 0 49 56 55 16 46 39 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56 44 58 7 11 163 0 0 57 3 54 16 51 12 0 311 -14 56 57 40 57 10 7 56 28 21 57 39 32 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 1388-01672-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 00 52.7464 DE: +21 23 16.246 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .018 ) * V mag [mag]: 10.3 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1252) Celestia approx. diameter [km]: 17 approx. diameter ["]: .012 distance from Earth [AU]: 1.87900 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 454 number of rejected observations: 49 time covered by the observations: 1933 Mar 28 - 2008 Mar 15 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.020, 60° remarks: * orbital elements for (1252) Celestia : Mean anomaly = 317.33510865 deg Arg. of pericenter = 62.95869650 deg Long. of node = 141.06628459 deg Inclination = 33.89256473 deg Eccentricity = 0.20408094 Semimajor axis = 2.69545306 AU Perihelion dist = 2.14536247 AU Mag: H = 10.61, G = 0.15 Epoch of elements : MJD 54557.69600000 TDT (2008 Apr 01.696) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 1 1252 Celestia 16h 42.7m UT 10.3 8 0 52.746 21 23 16.25TYC 1388-01672-1 11.5 15.2 17 1.4 1.879 1.422 25.64 39.1265 21.381 -69.75 4.87 16.7121 -0.15684 0.12058 4.23847 5.48263 0.00526 -0.00110 2000 315.6210672008 325.00000 62.958696141.066285 33.8925650.20408094 2.6954531 2.145362510.9 5.00.15 RATE 2.2271860 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.026 66 3.36 0.029 0 54553.5020080401_1672-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org