IOTA/IOTA-ES occultation update for (2690) Ristiina / UCAC4 384-080269 event on 2024 Feb 12, 01:41 UT Visible from Summary ------- On 2024 Feb 12 UT, the 18.5795934769226 km diameter asteroid (2690) Ristiina will occult a 11.6 mag star in the constellation Serpens for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.12 mag to 17.72 mag (the magnitude of the asteroid) for at most 0.640 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: 97 * date and approx. time of event: 2024 Feb 12, 01:37 - 2024 Feb 12, 01:44 * geocentric midpoint of event [JD]: 2460352.57022729 * magnitude of target star: 11.60 * magnitude drop [mag]: 6.12 * estimated maximum duration [s]: 0.640 * Moon: 7 % sunlit, 92° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 101°) * approx speed of asteroid's shadow [km/s]: 29.5427 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 384-080269 by 2690 Ristiina on 2024 Feb 12 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 3 0 0 - 8 29 10 1 37 33.3 0 103 -57 - 8 34 28 - 8 23 52 - 8 38 41 - 8 19 39 .... 4 0 0 - 8 43 25 1 37 33.3 1 103 -57 - 8 48 43 - 8 38 7 - 8 52 57 - 8 33 54 0.14 5 0 0 - 8 57 39 1 37 33.5 2 103 -56 - 9 2 56 - 8 52 21 - 9 7 10 - 8 48 8 0.13 6 0 0 - 9 11 50 1 37 33.7 3 103 -55 - 9 17 7 - 9 6 32 - 9 21 21 - 9 2 19 0.13 7 0 0 - 9 25 58 1 37 33.9 5 103 -54 - 9 31 16 - 9 20 40 - 9 35 29 - 9 16 27 0.13 8 0 0 - 9 40 3 1 37 34.3 6 103 -53 - 9 45 21 - 9 34 46 - 9 49 34 - 9 30 32 0.13 9 0 0 - 9 54 5 1 37 34.7 7 102 -52 - 9 59 23 - 9 48 48 -10 3 36 - 9 44 35 0.13 10 0 0 -10 8 4 1 37 35.1 8 102 -51 -10 13 21 -10 2 46 -10 17 34 - 9 58 33 0.13 11 0 0 -10 21 58 1 37 35.7 9 102 -50 -10 27 16 -10 16 41 -10 31 29 -10 12 28 0.13 12 0 0 -10 35 49 1 37 36.3 10 102 -49 -10 41 6 -10 30 31 -10 45 19 -10 26 18 0.13 13 0 0 -10 49 35 1 37 37.0 11 102 -48 -10 54 52 -10 44 17 -10 59 5 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- 7 10 55 - 7 25 44 - 7 6 41 0.14 176 0 0 - 7 1 47 1 44 39.7 8 257 70 - 7 7 5 - 6 56 29 - 7 11 19 - 6 52 16 0.14 177 0 0 - 6 47 21 1 44 40.2 7 257 69 - 6 52 39 - 6 42 3 - 6 56 53 - 6 37 50 0.15 178 0 0 - 6 32 56 1 44 40.7 6 257 68 - 6 38 14 - 6 27 38 - 6 42 27 - 6 23 24 0.15 179 0 0 - 6 18 30 1 44 41.0 5 257 67 - 6 23 48 - 6 13 13 - 6 28 2 - 6 8 59 0.15 180 0 0 - 6 4 6 1 44 41.3 4 257 66 - 6 9 24 - 5 58 48 - 6 13 38 - 5 54 35 0.16 -179 0 0 - 5 49 43 1 44 41.6 3 257 65 - 5 55 1 - 5 44 25 - 5 59 14 - 5 40 12 0.17 -178 0 0 - 5 35 21 1 44 41.8 2 257 64 - 5 40 39 - 5 30 3 - 5 44 53 - 5 25 50 0.20 -177 0 0 - 5 21 1 1 44 41.9 1 257 63 - 5 26 19 - 5 15 43 - 5 30 32 - 5 11 30 0.28 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: UCAC4 384-080269 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 20 50.4835 DE: -13 16 39.056 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 20 50.4836 DE: -13 16 39.057 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.6 * B mag [mag]: 12.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2690) Ristiina asteroid class: approx. diameter [km]: 19 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.67320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.012", 0.001", 100.798° remarks: * orbital elements for (2690)Ristiina : Mean anomaly = 211.1253650929 deg Arg. of pericenter = 263.4177728597 deg Long. of node = 135.8773656151 deg Inclination = 11.4469489235 deg Eccentricity = 0.1114557823 Semimajor axis = 3.0375953158 AU Perihelion dist = 2.6990377535 AU Mag: H = 11.44, G = 0.15 Epoch of elements : MJD 60352.07022729 TDT (2024 Feb 12.0702) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.64,2024,2,12,1.685455,0.003839,-0.119950,16.667684,0.484234,-0.005322,0.000836,-0.000001,0.000000 93.6466,-13.3030,158.27,-13.91,False UCAC4 384-080269,17.34735650,-13.2775156,12.38,11.60,11.18,0.1,0,,17.36976700,-13.3030048,6.13,6.10,0,0,0 2690,Ristiina,17.72,18.846,3.6732,0,0,2.734,1.16,,1.6,0 0,210.9261,2024,2,11,263.4178,135.8774,11.4469,0.11146,3.03760,2.69904,11.44,5.0,0.15 1.399,0.0117,0.0013,101,0.0028,Known errors,1.80,0,-1,-1 20240212_080269,60138.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org