IOTA/IOTA-ES occultation update for (838) Seraphina / UCAC4 420-144398 event on 2024 Dec 18, 11:19 UT Visible from Summary ------- On 2024 Dec 18 UT, the 54.87 km diameter asteroid (838) Seraphina will occult a 11.8 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.71 mag to 15.49 mag (the magnitude of the asteroid) for at most 1.510 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: 100 * date and approx. time of event: 2024 Dec 18, 11:16 - 2024 Dec 18, 11:22 * geocentric midpoint of event [JD]: 2460662.97209433 * magnitude of target star: 11.82 * magnitude drop [mag]: 3.71 * estimated maximum duration [s]: 1.510 * Moon: 89 % sunlit, 160° distance * Sun: 55° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 58 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 70°) * approx speed of asteroid's shadow [km/s]: 36.3429 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 420-144398 by 838 Seraphina on 2024 Dec 18 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 - 29 0 0 -30 17 51 11 17 1.8 0 97 55 -30 33 34 .. .. .. -30 36 38 .. .. .. .... - 28 0 0 -30 24 2 11 17 1.8 1 96 56 -30 39 44 -30 8 22 -30 42 48 -30 5 18 0.21 - 27 0 0 -30 30 0 11 17 1.8 2 96 56 -30 45 42 -30 14 20 -30 48 45 -30 11 17 0.26 - 26 0 0 -30 35 45 11 17 1.9 3 95 57 -30 51 26 -30 20 5 -30 54 30 -30 17 2 0.28 - 25 0 0 -30 41 16 11 17 2.1 3 95 58 -30 56 57 -30 25 37 -31 0 1 -30 22 34 0.29 - 24 0 0 -30 46 35 11 17 2.3 4 94 59 -31 2 15 -30 30 56 -31 5 19 -30 27 53 0.29 - 23 0 0 -30 51 40 11 17 2.5 5 94 60 -31 7 20 -30 36 1 -31 10 23 -30 32 59 0.30 - 22 0 0 -30 56 32 11 17 2.8 6 93 61 -31 12 11 -30 40 54 -31 15 15 -30 37 51 0.30 - 21 0 0 -31 1 10 11 17 3.1 7 93 61 -31 16 49 -30 45 32 -31 19 52 -30 42 30 0.30 - 20 0 0 -31 5 35 11 17 3.5 8 92 62 -31 21 14 -30 49 58 -31 24 17 -30 46 55 0.30 - 19 0 0 -31 9 47 11 17 3.9 9 92 63 -31 25 25 -30 54 10 -31 28 28 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= +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 420-144398 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 23 48.6891 DE: -06 03 30.561 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 23 48.6891 DE: -06 03 30.561 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (838) Seraphina asteroid class: approx. diameter [km]: 55 approx. diameter ["]: 0.026 distance from Earth [AU]: 2.96310 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#96 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", 0.002", 69.563° remarks: * orbital elements for (838)Seraphina : Mean anomaly = 346.4261303014 deg Arg. of pericenter = 117.7518624345 deg Long. of node = 240.0164181731 deg Inclination = 10.4228842411 deg Eccentricity = 0.1307886460 Semimajor axis = 2.8985399995 AU Perihelion dist = 2.5194438777 AU Mag: H = 10.16, G = 0.15 Epoch of elements : MJD 60662.47209409 TDT (2024 Dec 18.4721) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#962023Apr24,1.51,2024,12,18,11.330264,0.066132,-0.291859,19.996734,4.572993,0.004372,0.001982,-0.000001,0.000000 63.7589,-5.9522,9.25,-23.41,False UCAC4 420-144398,21.39685813,-6.0584888,12.35,11.82,11.53,0.0,0,,21.41856817,-5.9522025,3.71,3.55,0,0,0 838,Seraphina,15.49,54.870,2.9631,0,0,3.978,13.57,,2.8,0 0,346.3318,2024,12,18,117.7519,240.0164,10.4229,0.13079,2.89854,2.51944,10.16,5.0,0.15 1.097,0.0120,0.0019,70,0.0025,Known errors,0.90,0,-1,-1 20241218_144398,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org