IOTA/IOTA-ES occultation update for (3898) Curlewis / UCAC4 336-121141 event on 2024 Oct 14, 21:28 UT Visible from Summary ------- On 2024 Oct 14 UT, the 16.2820698849609 km diameter asteroid (3898) Curlewis will occult a 11.1 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 7.81 mag to 18.95 mag (the magnitude of the asteroid) for at most 0.630 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: 98 * date and approx. time of event: 2024 Oct 14, 21:24 - 2024 Oct 14, 21:32 * geocentric midpoint of event [JD]: 2460598.39473550 * magnitude of target star: 11.14 * magnitude drop [mag]: 7.81 * estimated maximum duration [s]: 0.630 * Moon: 90 % sunlit, 75° distance * Sun: 68° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 90°) * approx speed of asteroid's shadow [km/s]: 26.1410 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 336-121141 by 3898 Curlewis on 2024 Oct 14 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 -164 0 0 - 1 1 46 21 24 21.3 1 113 69 - 1 6 38 - 0 56 54 - 1 10 0 - 0 53 32 .... -163 0 0 - 1 27 14 21 24 21.5 2 113 70 - 1 32 6 - 1 22 21 - 1 35 27 - 1 19 0 0.09 -162 0 0 - 1 52 41 21 24 21.7 3 113 71 - 1 57 34 - 1 47 49 - 2 0 55 - 1 44 28 0.07 -161 0 0 - 2 18 8 21 24 22.0 4 113 73 - 2 23 1 - 2 13 16 - 2 26 22 - 2 9 55 0.06 -160 0 0 - 2 43 34 21 24 22.4 5 113 74 - 2 48 26 - 2 38 42 - 2 51 48 - 2 35 21 0.05 -159 0 0 - 3 8 58 21 24 22.8 6 113 75 - 3 13 50 - 3 4 6 - 3 17 12 - 3 0 45 0.05 -158 0 0 - 3 34 20 21 24 23.4 8 113 76 - 3 39 12 - 3 29 28 - 3 42 33 - 3 26 6 0.04 -157 0 0 - 3 59 38 21 24 24.0 9 113 77 - 4 4 30 - 3 54 46 - 4 7 51 - 3 51 25 0.04 -156 0 0 - 4 24 53 21 24 24.8 10 112 78 - 4 29 45 - 4 20 1 - 4 33 6 - 4 16 40 0.04 -155 0 0 - 4 50 3 21 24 25.6 11 112 79 - 4 54 55 - 4 45 11 - 4 58 16 - 4 41 50 0.04 -154 0 0 - 5 15 8 21 24 26.5 12 112 80 - 5 20 0 - 5 10 17 - 5 23 21 - 5 6 56 0.04 -153 0 0 - 5 40 8 21 24 27.5 13 112 81 - 5 44 59 - 5 35 16 - 5 48 20 - 5 31 55 0.04 -152 0 0 - 6 5 1 21 24 28.6 14 112 82 - 6 9 52 - 6 0 10 - 6 13 13 - 5 56 49 0.04 -151 0 0 - 6 29 48 21 24 29.7 15 112 83 - 6 34 39 - 6 24 56 - 6 37 59 - 6 21 36 0.03 -150 0 0 - 6 54 27 21 24 31.0 16 112 84 - 6 59 18 - 6 49 36 - 7 2 38 - 6 46 15 0.03 -149 0 0 - 7 18 58 21 24 32.3 17 112 85 - 7 23 49 - 7 14 7 - 7 27 9 - 7 10 47 0.03 -148 0 0 - 7 43 20 21 24 33.7 18 112 87 - 7 48 11 - 7 38 30 - 7 51 31 - 7 35 9 0.03 -147 0 0 - 8 7 34 21 24 35.2 19 111 88 - 8 12 24 - 8 2 43 - 8 15 44 - 7 59 23 0.03 -146 0 0 - 8 31 37 21 24 36.7 20 111 89 - 8 36 27 - 8 26 47 - 8 39 47 - 8 23 27 0.03 -145 0 0 - 8 55 30 21 24 38.4 22 111 89 - 9 0 20 - 8 50 41 - 9 3 40 - 8 47 21 0.03 -144 0 0 - 9 19 13 21 24 40.1 23 111 89 - 9 24 2 - 9 14 23 - 9 27 22 - 9 11 4 0.03 -143 0 0 - 9 42 44 21 24 41.9 24 111 88 - 9 47 33 - 9 37 55 - 9 50 52 - 9 34 35 0.03 -142 0 0 -10 6 3 21 24 43.7 25 111 87 -10 10 52 -10 1 14 -10 14 11 - 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1 47 17 0.18 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 336-121141 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 54.3336 DE: -22 50 18.372 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 59 54.3335 DE: -22 50 18.372 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * B mag [mag]: 11.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3898) Curlewis asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.47360 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): 0.014", 0.002", 89.783° remarks: * orbital elements for (3898)Curlewis : Mean anomaly = 263.9232905979 deg Arg. of pericenter = 215.9254895852 deg Long. of node = 184.1720311145 deg Inclination = 0.6591293638 deg Eccentricity = 0.1585531540 Semimajor axis = 3.1134514803 AU Perihelion dist = 2.6198039283 AU Mag: H = 12.81, G = 0.15 Epoch of elements : MJD 60597.89473537 TDT (2024 Oct 14.8947) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.63,2024,10,14,21.473652,-0.000572,-0.020340,14.754204,-0.122691,0.005428,0.000037,-0.000001,0.000000 -75.6706,-22.8407,-145.65,-8.58,False UCAC4 336-121141,17.99842603,-22.8384365,11.78,11.14,10.79,0.1,0,,18.02326107,-22.8406546,7.81,7.70,0,0,0 3898,Curlewis,18.95,16.534,3.4736,0,0,2.702,-0.31,,1.6,0 0,263.7628,2024,10,14,215.9255,184.1720,0.6591,0.15855,3.11345,2.61980,12.80,5.0,0.15 1.345,0.0143,0.0022,90,0.0022,Known errors,0.82,0,-1,-1 20241014_121141,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org