IOTA/IOTA-ES occultation update for (4577) Chikako / UCAC4 356-077455 event on 2024 Jan 23, 08:19 UT Visible from Summary ------- On 2024 Jan 23 UT, the 11.383 km diameter asteroid (4577) Chikako will occult a 11.7 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.13 mag to 17.85 mag (the magnitude of the asteroid) for at most 0.370 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: 99 * date and approx. time of event: 2024 Jan 23, 08:16 - 2024 Jan 23, 08:23 * geocentric midpoint of event [JD]: 2460332.84701792 * magnitude of target star: 11.72 * magnitude drop [mag]: 6.13 * estimated maximum duration [s]: 0.370 * Moon: 94 % sunlit, 148° distance * Sun: 59° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.001", 112°) * approx speed of asteroid's shadow [km/s]: 30.7910 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 356-077455 by 4577 Chikako on 2024 Jan 23 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 - 87 0 0 18 11 7 8 16 15.9 1 110 -58 18 7 49 18 14 25 18 6 13 18 16 0 .... - 86 0 0 17 49 53 8 16 15.9 2 111 -57 17 46 35 17 53 11 17 45 0 17 54 47 0.02 - 85 0 0 17 28 22 8 16 16.1 3 111 -56 17 25 3 17 31 40 17 23 28 17 33 16 -0.02 - 84 0 0 17 6 32 8 16 16.3 4 111 -55 17 3 14 17 9 51 17 1 38 17 11 27 -0.03 - 83 0 0 16 44 25 8 16 16.6 5 111 -54 16 41 6 16 47 44 16 39 30 16 49 21 -0.04 - 82 0 0 16 22 1 8 16 16.9 6 112 -53 16 18 42 16 25 21 16 17 6 16 26 57 -0.05 - 81 0 0 15 59 20 8 16 17.3 7 112 -52 15 56 1 16 2 40 15 54 25 16 4 16 -0.05 - 80 0 0 15 36 23 8 16 17.8 8 112 -51 15 33 3 15 39 43 15 31 27 15 41 19 -0.05 - 79 0 0 15 13 10 8 16 18.4 9 113 -50 15 9 50 15 16 30 15 8 13 15 18 6 -0.06 - 78 0 0 14 49 41 8 16 19.0 10 113 -49 14 46 20 14 53 1 14 44 44 14 54 38 -0.06 - 77 0 0 14 25 57 8 16 19.7 11 113 -48 14 22 36 14 29 17 14 20 59 14 30 54 -0.06 - 76 0 0 14 1 58 8 16 20.4 12 113 -46 13 58 37 14 5 19 13 57 0 14 6 56 -0.06 - 75 0 0 13 37 45 8 16 21.3 13 114 -45 13 34 24 13 41 6 13 32 46 13 42 43 -0.06 - 74 0 0 13 13 18 8 16 22.2 14 114 -44 13 9 56 13 16 39 13 8 19 13 18 16 -0.06 - 73 0 0 12 48 38 8 16 23.2 15 114 -43 12 45 16 12 51 59 12 43 39 12 53 36 -0.06 - 72 0 0 12 23 45 8 16 24.2 16 114 -42 12 20 23 12 27 6 12 18 45 12 28 44 -0.06 - 71 0 0 11 58 39 8 16 25.3 17 114 -41 11 55 17 12 2 1 11 53 40 12 3 39 -0.07 - 70 0 0 11 33 22 8 16 26.5 18 115 -40 11 30 0 11 36 45 11 28 23 11 38 22 -0.07 - 69 0 0 11 7 54 8 16 27.8 20 115 -39 11 4 32 11 11 17 11 2 54 11 12 54 -0.07 - 68 0 0 10 42 16 8 16 29.1 21 115 -38 10 38 53 10 45 38 10 37 16 10 47 16 -0.07 - 67 0 0 10 16 27 8 16 30.5 22 115 -37 10 13 4 10 19 50 10 11 27 10 21 28 -0.07 - 66 0 0 9 50 29 8 16 32.0 23 115 -36 9 47 6 9 53 52 9 45 28 9 55 30 -0.07 - 65 0 0 9 24 22 8 16 33.6 24 116 -35 9 20 59 9 27 45 9 19 21 9 29 23 -0.07 - 64 0 0 8 58 7 8 16 35.2 25 116 -34 8 54 44 9 1 31 8 53 6 9 3 9 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24 37 -0.05 86 0 0 -10 9 17 8 23 8.6 1 251 61 -10 12 33 -10 6 1 -10 14 8 -10 4 26 -0.02 87 0 0 - 9 48 48 8 23 8.7 0 251 60 - 9 52 4 - 9 45 31 - 9 53 39 - 9 43 56 0.15 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 356-077455 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 06 27.0543 DE: -18 52 17.725 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 06 27.0543 DE: -18 52 17.725 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4577) Chikako asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.89210 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#40 date of fit: 2023 Apr 25 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): 0.007", 0.001", 112.321° remarks: * orbital elements for (4577)Chikako : Mean anomaly = 66.8151034976 deg Arg. of pericenter = 65.8449942691 deg Long. of node = 57.5048767285 deg Inclination = 9.3651929445 deg Eccentricity = 0.2888427822 Semimajor axis = 2.6233495459 AU Perihelion dist = 1.8656139644 AU Mag: H = 12.54, G = 0.15 Epoch of elements : MJD 60332.34701796 TDT (2024 Jan 23.3470) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#402023Apr25,0.37,2024,1,23,8.328430,0.021095,0.077640,16.802116,-4.441779,-0.004907,0.001036,-0.000001,0.000000 -5.1476,-18.9363,57.99,-19.53,False UCAC4 356-077455,16.10751504,-18.8715901,12.34,11.72,11.39,0.0,0,K,16.13044451,-18.9363165,6.13,6.02,0,0,0 4577,Chikako,17.85,11.383,2.8921,0,0,3.602,-13.51,,1.0,0 0,66.7346,2024,1,23,65.8450,57.5049,9.3652,0.28884,2.62335,1.86561,12.54,5.0,0.15 1.241,0.0073,0.0009,112,0.0013,Known errors,1.10,0,-1,-1 20240123_077455,60137.03 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org