IOTA/IOTA-ES occultation update for (3898) Curlewis / TYC 6843-00778-1 event on 2024 May 25, 00:11 UT Visible from Summary ------- On 2024 May 25 UT, the 16.436 km diameter asteroid (3898) Curlewis will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.18 mag to 18.03 mag (the magnitude of the asteroid) for at most 1.590 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: 96 * date and approx. time of event: 2024 May 25, 00:00 - 2024 May 25, 00:21 * geocentric midpoint of event [JD]: 2460455.50795112 * magnitude of target star: 11.85 * magnitude drop [mag]: 6.18 * estimated maximum duration [s]: 1.590 * Moon: 98 % sunlit, 13° distance * Sun: 151° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.004", 89°) * approx speed of asteroid's shadow [km/s]: 10.3410 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6843-00778-1 by 3898 Curlewis on 2024 May 25 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 ' " Latitude Latitude Latitude Latitude - 65 0 0 - 1 36 31 0 21 43.4 1 113 -30 - 1 31 42 - 1 41 21 - 1 27 45 - 1 45 17 .... - 64 0 0 - 2 1 32 0 21 43.2 2 112 -31 - 1 56 42 - 2 6 21 - 1 52 46 - 2 10 17 0.08 - 63 0 0 - 2 26 29 0 21 42.7 3 112 -32 - 2 21 40 - 2 31 19 - 2 17 44 - 2 35 15 0.05 - 62 0 0 - 2 51 24 0 21 42.0 4 112 -33 - 2 46 35 - 2 56 14 - 2 42 39 - 3 0 9 0.04 - 61 0 0 - 3 16 15 0 21 41.0 5 112 -34 - 3 11 26 - 3 21 5 - 3 7 30 - 3 25 0 0.03 - 60 0 0 - 3 41 2 0 21 39.9 6 112 -35 - 3 36 13 - 3 45 51 - 3 32 17 - 3 49 47 0.03 - 59 0 0 - 4 5 44 0 21 38.5 7 112 -36 - 4 0 55 - 4 10 33 - 3 56 59 - 4 14 29 0.02 - 58 0 0 - 4 30 20 0 21 37.0 8 112 -37 - 4 25 31 - 4 35 9 - 4 21 36 - 4 39 5 0.02 - 57 0 0 - 4 54 51 0 21 35.2 9 112 -38 - 4 50 2 - 4 59 40 - 4 46 7 - 5 3 35 0.02 - 56 0 0 - 5 19 15 0 21 33.2 10 112 -39 - 5 14 26 - 5 24 4 - 5 10 31 - 5 27 59 0.02 - 55 0 0 - 5 43 32 0 21 31.0 12 112 -40 - 5 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0 0 - 7 5 3 0 1 32.6 15 249 13 - 7 0 15 - 7 9 51 - 6 56 21 - 7 13 45 0.02 107 0 0 - 6 41 15 0 1 29.7 14 248 14 - 6 36 27 - 6 46 3 - 6 32 32 - 6 49 57 0.02 108 0 0 - 6 17 17 0 1 26.9 13 248 15 - 6 12 29 - 6 22 5 - 6 8 34 - 6 26 0 0.02 109 0 0 - 5 53 12 0 1 24.4 12 248 16 - 5 48 23 - 5 58 0 - 5 44 28 - 6 1 55 0.02 110 0 0 - 5 28 58 0 1 22.1 11 248 17 - 5 24 9 - 5 33 47 - 5 20 14 - 5 37 42 0.02 111 0 0 - 5 4 37 0 1 19.9 10 248 19 - 4 59 48 - 5 9 26 - 4 55 53 - 5 13 21 0.02 112 0 0 - 4 40 10 0 1 18.0 9 248 20 - 4 35 21 - 4 44 58 - 4 31 25 - 4 48 54 0.02 113 0 0 - 4 15 36 0 1 16.3 8 248 21 - 4 10 47 - 4 20 25 - 4 6 51 - 4 24 20 0.02 114 0 0 - 3 50 56 0 1 14.8 7 248 22 - 3 46 7 - 3 55 45 - 3 42 11 - 3 59 41 0.03 115 0 0 - 3 26 12 0 1 13.5 6 248 23 - 3 21 22 - 3 31 1 - 3 17 27 - 3 34 57 0.03 116 0 0 - 3 1 23 0 1 12.4 5 248 24 - 2 56 33 - 3 6 12 - 2 52 37 - 3 10 8 0.04 117 0 0 - 2 36 30 0 1 11.6 4 248 25 - 2 31 40 - 2 41 19 - 2 27 44 - 2 45 15 0.04 118 0 0 - 2 11 33 0 1 10.9 3 248 26 - 2 6 44 - 2 16 23 - 2 2 48 - 2 20 19 0.06 119 0 0 - 1 46 34 0 1 10.5 2 248 27 - 1 41 45 - 1 51 24 - 1 37 49 - 1 55 20 0.10 120 0 0 - 1 21 33 0 1 10.3 0 247 28 - 1 16 44 - 1 26 23 - 1 12 48 - 1 30 19 0.31 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: TYC 6843-00778-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 11 42.9323 DE: -22 31 24.218 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 11 42.9324 DE: -22 31 24.218 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3898) Curlewis asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.50000 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 date of fit: 2023 Apr 24 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): 0.022", 0.004", 88.6° remarks: * orbital elements for (3898)Curlewis : Mean anomaly = 238.3472612346 deg Arg. of pericenter = 215.8752632829 deg Long. of node = 184.1734862470 deg Inclination = 0.6591283020 deg Eccentricity = 0.1585515904 Semimajor axis = 3.1138292547 AU Perihelion dist = 2.6201266742 AU Mag: H = 12.81, G = 0.15 Epoch of elements : MJD 60455.00795112 TDT (2024 May 25.0080) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,1.59,2024,5,25,0.190827,-0.000031,-0.023250,-5.836746,-0.006266,-0.002743,-0.000137,0.000001,0.000000 27.3611,-22.5183,176.38,21.00,False TYC 6843-00778-1,18.19525897,-22.5233940,12.10,11.85,11.72,0.0,0,,18.22010430,-22.5183111,6.19,5.87,0,0,0 3898,Curlewis,18.03,16.436,2.5000,0,0,-1.481,-0.02,,1.6,0 0,238.1665,2024,5,24,215.8753,184.1735,0.6591,0.15855,3.11383,2.62013,12.80,5.0,0.15 1.408,0.0217,0.0037,89,0.0037,Known errors,0.79,0,-1,-1 20240525_0778-1,60139.36 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 08:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org