IOTA/IOTA-ES occultation update for (488) Kreusa / UCAC4 439-001371 event on 2023 Jan 21, 23:48 UT Visible from E USA Summary ------- On 2023 Jan 21 UT, the 156.8 km diameter asteroid (488) Kreusa will occult a 12.2 mag star in the constellation Cetus for observers along a path across E USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.21 mag to 14.25 mag (the magnitude of the asteroid) for at most 6.720 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2023 Jan 21, 23:44 - 2023 Jan 21, 23:53 * geocentric midpoint of event [JD]: 2459966.49222325 * magnitude of target star: 12.19 * magnitude drop [mag]: 2.21 * estimated maximum duration [s]: 6.720 * Moon: 0 % sunlit, 71° distance * Sun: 73° distance * rough path description: E USA The occultation path -------------------- * approximate projected width [km]: 162 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 62°) * approx speed of asteroid's shadow [km/s]: 23.3237 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 439-001371 by 488 Kreusa on 2023 Jan 21 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Longitude Longitude Longitude Longitude .. .. .. 52 0 0 .. .. .... .. .. .. ... .. .. - 23 12 15 ... .. .. - 23 56 34 .... - 25 43 51 51 0 0 23 53 9.7 7 258 -51 - 16 36 25 - 31 23 43 - 15 1 35 - 31 51 46 .... - 32 57 0 50 0 0 23 53 6.0 11 253 -48 - 27 52 23 - 37 9 5 - 27 19 6 - 37 31 15 -0.21 Latitude Latitude Latitude Latitude - 33 0 0 49 59 30 23 53 6.0 11 253 -48 49 14 22 50 44 48 49 10 4 50 49 7 -0.26 - 34 0 0 49 49 19 23 53 5.3 12 252 -47 49 4 3 50 34 44 48 59 45 50 39 4 -0.25 - 35 0 0 49 38 40 23 53 4.6 13 251 -47 48 53 17 50 24 13 48 48 58 50 28 34 -0.25 - 36 0 0 49 27 33 23 53 3.8 13 250 -46 48 42 2 50 13 14 48 37 42 50 17 35 -0.25 - 37 0 0 49 15 57 23 53 3.0 14 249 -46 48 30 18 50 1 47 48 25 58 50 6 9 -0.25 - 38 0 0 49 3 53 23 53 2.2 15 249 -45 48 18 5 49 49 51 48 13 44 49 54 14 -0.25 - 39 0 0 48 51 19 23 53 1.3 16 248 -45 48 5 23 49 37 26 48 1 1 49 41 50 -0.25 - 40 0 0 48 38 16 23 53 0.3 16 247 -44 47 52 11 49 24 32 47 47 48 49 28 57 -0.25 - 41 0 0 48 24 43 23 52 59.3 17 246 -44 47 38 28 49 11 8 47 34 5 49 15 34 -0.25 - 42 0 0 48 10 40 23 52 58.3 18 246 -43 47 24 16 48 57 15 47 19 51 49 1 41 -0.25 - 43 0 0 47 56 6 23 52 57.2 18 245 -43 47 9 32 48 42 51 47 5 6 48 47 19 -0.25 - 44 0 0 47 41 1 23 52 56.1 19 244 -42 46 54 17 48 27 56 46 49 51 48 32 25 -0.25 - 45 0 0 47 25 25 23 52 54.9 20 243 -41 46 38 31 48 12 31 46 34 3 48 17 0 -0.25 - 46 0 0 47 9 18 23 52 53.6 21 243 -41 46 22 12 47 56 34 46 17 44 48 1 4 -0.25 - 47 0 0 46 52 38 23 52 52.3 21 242 -40 46 5 21 47 40 5 46 0 52 47 44 37 -0.25 - 48 0 0 46 35 25 23 52 51.0 22 241 -40 45 47 58 47 23 4 45 43 27 47 27 36 -0.25 - 49 0 0 46 17 40 23 52 49.5 23 240 -39 45 30 1 47 5 30 45 25 30 47 10 4 -0.25 - 50 0 0 45 59 21 23 52 48.1 24 240 -38 45 11 31 46 47 23 45 6 58 46 51 58 -0.25 - 51 0 0 45 40 29 23 52 46.5 24 239 -38 44 52 27 46 28 42 44 47 53 46 33 18 -0.25 - 52 0 0 45 21 2 23 52 44.9 25 238 -37 44 32 48 46 9 28 44 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171 0 0 -21 47 8 23 44 24.2 2 92 75 -22 31 1 -21 3 6 -22 35 12 -20 58 54 -0.33 170 0 0 -21 45 43 23 44 24.1 1 92 74 -22 29 37 -21 1 40 -22 33 47 -20 57 28 -0.40 Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 439-001371 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 07 12.5440 DE: -02 18 28.776 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 07 12.5439 DE: -02 18 28.776 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (488) Kreusa asteroid class: approx. diameter [km]: 157 approx. diameter ["]: 0.060 distance from Earth [AU]: 3.58570 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#123 date of fit: 2022 Nov 22 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.013", 0.002", 61.647° remarks: * orbital elements for (488)Kreusa : Mean anomaly = 246.0557305177 deg Arg. of pericenter = 76.2023434619 deg Long. of node = 83.0485171795 deg Inclination = 11.4569447936 deg Eccentricity = 0.1580998992 Semimajor axis = 3.1737975889 AU Perihelion dist = 2.6720205101 AU Mag: H = 7.92, G = 0.15 Epoch of elements : MJD 59965.99229167 TDT (2023 Jan 21.9923) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1232022Nov22,6.72,2023,1,21,23.813358,-0.154388,0.207859,10.565047,7.854031,0.005505,0.002007,0.000000,0.000000 -101.1875,-2.1870,-174.36,-19.79,False UCAC4 439-001371,1.12015114,-2.3079932,0.00,12.19,0.00,0.0,0,K,1.13951783,-2.1870338,2.21,0.00,0,0,0 488,Kreusa,14.25,156.8,3.5857,0,0,1.729,19.27,,8.8,0 0,245.8828,2023,1,21,76.2023,83.0485,11.4569,0.15810,3.17380,2.67202,7.93,5.0,0.15 1.048,0.0127,0.0022,62,0.0029,Known errors,-1.00,-1,-1,-1 20230121_001371,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org