IOTA/IOTA-ES occultation update for (98943) 2001 CC21 / UCAC4 613-017493 event on 2024 Jan 10, 13:36 UT Visible from Summary ------- On 2024 Jan 10 UT, the 0.604 km diameter asteroid (98943) 2001 CC21 will occult a 13.5 mag star in the constellation Auriga for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.22 mag to 17.65 mag (the magnitude of the asteroid) for at most 0.120 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: 6 * date and approx. time of event: 2024 Jan 10, 13:19 - 2024 Jan 10, 13:53 * geocentric midpoint of event [JD]: 2460320.06717683 * magnitude of target star: 13.45 * magnitude drop [mag]: 4.22 * estimated maximum duration [s]: 0.120 * Moon: 2 % sunlit, 159° distance * Sun: 145° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 1 * 1 sigma uncertainty interval [path widths]: +/- 10.78 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.060, +/- 0.029) * 1 sigma uncertainty ellipse (major, minor, PA): (0.061", 0.025", 75°) * approx speed of asteroid's shadow [km/s]: 5.2064 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 613-017493 by 98943 2001 CC21 on 2024 Jan 10 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 44 0 0 -24 29 37 13 53 13.3 1 53 26 -24 29 22 -24 29 53 -24 23 51 -24 35 24 .... 45 0 0 -23 50 2 13 53 12.6 2 53 25 -23 49 46 -23 50 17 -23 44 17 -23 55 46 0.44 46 0 0 -23 10 56 13 53 11.3 3 53 24 -23 10 41 -23 11 11 -23 5 14 -23 16 39 0.57 47 0 0 -22 32 22 13 53 9.5 4 52 23 -22 32 7 -22 32 37 -22 26 42 -22 38 3 0.63 48 0 0 -21 54 20 13 53 7.1 5 52 22 -21 54 5 -21 54 35 -21 48 42 -21 59 59 0.66 49 0 0 -21 16 52 13 53 4.2 6 52 21 -21 16 37 -21 17 7 -21 11 16 -21 22 28 0.68 50 0 0 -20 39 57 13 53 0.7 7 51 20 -20 39 42 -20 40 12 -20 34 23 -20 45 31 0.70 51 0 0 -20 3 36 13 52 56.6 9 51 19 -20 3 22 -20 3 51 -19 58 5 -20 9 9 0.71 52 0 0 -19 27 52 13 52 52.0 10 50 17 -19 27 37 -19 28 6 -19 22 22 -19 33 22 0.72 53 0 0 -18 52 43 13 52 46.9 11 50 16 -18 52 28 -18 52 57 -18 47 15 -18 58 11 0.72 54 0 0 -18 18 10 13 52 41.3 12 50 15 -18 17 56 -18 18 25 -18 12 45 -18 23 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-34 43 44 1.30 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 613-017493 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 54 38.3969 DE: +32 24 26.947 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 54 38.3967 DE: +32 24 26.947 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 13.5 * B mag [mag]: 14.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (98943) 2001 CC21 asteroid class: approx. diameter [km]: 1 approx. diameter ["]: 0.003 distance from Earth [AU]: 0.27480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#210 date of fit: 2023 Mar 06 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): 0.061", 0.025", 74.6° remarks: * orbital elements for (98943)2001 CC21 : Mean anomaly = 221.1991560063 deg Arg. of pericenter = 179.4402603228 deg Long. of node = 75.4581608215 deg Inclination = 4.8078988935 deg Eccentricity = 0.2192418265 Semimajor axis = 1.0322816276 AU Perihelion dist = 0.8059623181 AU Mag: H = 18.80, G = 0.15 Epoch of elements : MJD 60319.56717683 TDT (2024 Jan 10.5672) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#2102023Mar06,0.12,2024,1,10,13.612244,-0.064207,-0.585467,-2.921093,0.320464,0.001681,-0.000237,0.000001,0.000000 120.2882,32.4477,-22.34,-21.98,False UCAC4 613-017493,4.91066582,32.4074851,14.14,13.45,13.08,0.0,0,,4.93686974,32.4477305,4.22,4.14,0,0,0 98943,2001 CC21,17.65,0.604,0.2748,0,0,-7.378,10.24,,0.1,0 0,220.6662,2024,1,10,179.4403,75.4582,4.8079,0.21924,1.03228,0.80596,18.80,5.0,0.15 11.705,0.0613,0.0253,75,0.0327,Known errors,0.97,0,-1,-1 20240110_017493,60137.01 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org