IOTA/IOTA-ES occultation update for (2997) Cabrera / UCAC4 624-031633 event on 2024 Dec 19, 11:10 UT Visible from Summary ------- On 2024 Dec 19 UT, the 8.25 km diameter asteroid (2997) Cabrera will occult a 12.0 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 4.52 mag to 16.48 mag (the magnitude of the asteroid) for at most 0.670 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: 91 * date and approx. time of event: 2024 Dec 19, 11:02 - 2024 Dec 19, 11:18 * geocentric midpoint of event [JD]: 2460663.96581213 * magnitude of target star: 11.98 * magnitude drop [mag]: 4.52 * estimated maximum duration [s]: 0.670 * Moon: 82 % sunlit, 44° distance * Sun: 167° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 9 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.003", 95°) * approx speed of asteroid's shadow [km/s]: 12.3166 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 624-031633 by 2997 Cabrera on 2024 Dec 19 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 121 0 0 -18 10 41 11 18 36.6 0 53 -11 -18 7 35 -18 13 47 -18 4 27 -18 16 55 .... 122 0 0 -17 27 51 11 18 36.5 1 53 -12 -17 24 46 -17 30 57 -17 21 39 -17 34 4 0.09 123 0 0 -16 45 17 11 18 36.1 2 53 -14 -16 42 13 -16 48 22 -16 39 7 -16 51 29 0.28 124 0 0 -16 3 1 11 18 35.5 4 52 -15 -15 59 57 -16 6 5 -15 56 51 -16 9 11 0.35 125 0 0 -15 21 3 11 18 34.7 5 52 -16 -15 17 59 -15 24 7 -15 14 55 -15 27 11 0.38 126 0 0 -14 39 25 11 18 33.6 6 52 -17 -14 36 22 -14 42 28 -14 33 19 -14 45 32 0.40 127 0 0 -13 58 9 11 18 32.2 7 52 -18 -13 55 7 -14 1 11 -13 52 4 -14 4 14 0.41 128 0 0 -13 17 16 11 18 30.6 8 51 -19 -13 14 14 -13 20 17 -13 11 12 -13 23 20 0.42 129 0 0 -12 36 47 11 18 28.8 10 51 -21 -12 33 46 -12 39 47 -12 30 45 -12 42 49 0.43 130 0 0 -11 56 43 11 18 26.8 11 51 -22 -11 53 43 -11 59 43 -11 50 42 -12 2 44 0.44 131 0 0 -11 17 5 11 18 24.5 12 51 -23 -11 14 6 -11 20 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- 85 0 0 -21 44 32 11 2 55.8 1 308 1 -21 41 24 -21 47 41 -21 38 14 -21 50 51 0.60 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 624-031633 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 22 23.9520 DE: +34 43 38.950 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 22 23.9520 DE: +34 43 38.951 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2997) Cabrera asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.007 distance from Earth [AU]: 1.63790 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.026", 0.003", 94.859° remarks: * orbital elements for (2997)Cabrera : Mean anomaly = 84.2229166043 deg Arg. of pericenter = 350.3328027715 deg Long. of node = 354.9407836629 deg Inclination = 7.1786186318 deg Eccentricity = 0.1974113367 Semimajor axis = 2.5569399993 AU Perihelion dist = 2.0521710562 AU Mag: H = 12.92, G = 0.15 Epoch of elements : MJD 60663.46581367 TDT (2024 Dec 19.4658) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,0.67,2024,12,19,11.179491,-0.017648,-0.416655,-6.945626,0.294225,-0.000788,-0.001118,0.000001,0.000000 -160.2150,34.7154,11.63,-23.42,False UCAC4 624-031633,6.37332000,34.7274862,12.71,11.98,11.59,0.0,0,,6.40150022,34.7154079,4.52,4.46,0,0,0 2997,Cabrera,16.48,8.250,1.6379,0,0,-3.024,1.58,,0.8,0 0,84.1106,2024,12,19,350.3328,354.9408,7.1786,0.19741,2.55694,2.05217,12.91,5.0,0.15 1.503,0.0263,0.0033,95,0.0035,Known errors,1.11,0,-1,-1 20241219_031633,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org