IOTA/IOTA-ES occultation update for (1833) Shmakova / UCAC4 395-065629 event on 2024 Mar 08, 20:01 UT Visible from Summary ------- On 2024 Mar 08 UT, the 16.4441238812382 km diameter asteroid (1833) Shmakova will occult a 9.3 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.39 mag to 16.66 mag (the magnitude of the asteroid) for at most 1.130 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: 92 * date and approx. time of event: 2024 Mar 08, 19:54 - 2024 Mar 08, 20:08 * geocentric midpoint of event [JD]: 2460378.33442917 * magnitude of target star: 9.27 * magnitude drop [mag]: 7.39 * estimated maximum duration [s]: 1.130 * Moon: 4 % sunlit, 77° distance * Sun: 99° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 100°) * approx speed of asteroid's shadow [km/s]: 14.8744 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 395-065629 by 1833 Shmakova on 2024 Mar 8 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 53 0 0 - 5 57 27 19 54 29.4 0 101 -75 - 6 2 7 - 5 52 47 - 6 6 44 - 5 48 10 .... 54 0 0 - 6 9 19 19 54 29.5 1 101 -75 - 6 13 59 - 6 4 39 - 6 18 35 - 6 0 2 0.01 55 0 0 - 6 20 55 19 54 29.7 2 101 -76 - 6 25 35 - 6 16 15 - 6 30 11 - 6 11 39 -0.06 56 0 0 - 6 32 16 19 54 30.0 3 101 -76 - 6 36 56 - 6 27 36 - 6 41 32 - 6 23 0 -0.08 57 0 0 - 6 43 21 19 54 30.5 4 101 -77 - 6 48 1 - 6 38 42 - 6 52 37 - 6 34 6 -0.09 58 0 0 - 6 54 11 19 54 31.1 5 101 -77 - 6 58 50 - 6 49 31 - 7 3 26 - 6 44 56 -0.10 59 0 0 - 7 4 44 19 54 31.9 6 101 -77 - 7 9 23 - 7 0 5 - 7 13 58 - 6 55 29 -0.10 60 0 0 - 7 15 1 19 54 32.8 7 100 -78 - 7 19 40 - 7 10 22 - 7 24 15 - 7 5 47 -0.11 61 0 0 - 7 25 2 19 54 33.8 8 100 -78 - 7 29 40 - 7 20 23 - 7 34 15 - 7 15 48 -0.11 62 0 0 - 7 34 46 19 54 34.9 9 100 -78 - 7 39 24 - 7 30 7 - 7 43 59 - 7 25 32 -0.11 63 0 0 - 7 44 13 19 54 36.2 10 100 -78 - 7 48 51 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 395-065629 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 37 46.6342 DE: -11 10 55.391 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 37 46.6343 DE: -11 10 55.391 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.3 * B mag [mag]: 10.3 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1833) Shmakova asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.22590 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.013", 0.001", 99.8° remarks: * orbital elements for (1833)Shmakova : Mean anomaly = 288.5037323300 deg Arg. of pericenter = 153.3135410450 deg Long. of node = 158.0500730740 deg Inclination = 10.0087728186 deg Eccentricity = 0.1137171696 Semimajor axis = 2.6349306891 AU Perihelion dist = 2.3352938292 AU Mag: H = 11.80, G = 0.15 Epoch of elements : MJD 60377.83442912 TDT (2024 Mar 08.8344) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,1.13,2024,3,8,20.026300,-0.029293,0.123456,8.169716,1.934132,-0.005694,0.000640,0.000000,0.000000 142.3716,-11.2324,-117.75,-4.45,False UCAC4 395-065629,16.62962058,-11.1820530,10.26,9.27,8.74,0.2,0,,16.65190152,-11.2323857,7.40,7.48,0,0,0 1833,Shmakova,16.66,16.767,2.2259,0,0,2.194,7.64,,1.4,0 0,288.3114,2024,3,8,153.3135,158.0501,10.0088,0.11372,2.63493,2.33529,11.80,5.0,0.15 1.494,0.0127,0.0014,100,0.0051,Known errors,1.05,0,-1,-1 20240308_065629,60139.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org