IOTA/IOTA-ES occultation update for (25270) 1998 VR27 / G182811.8-180254 event on 2024 Jul 24, 06:04 UT Visible from Summary ------- On 2024 Jul 24 UT, the 16.5849311782941 km diameter asteroid (25270) 1998 VR27 will occult a 10.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.79 mag to 17.71 mag (the magnitude of the asteroid) for at most 1.880 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: 99 * date and approx. time of event: 2024 Jul 24, 05:54 - 2024 Jul 24, 06:14 * geocentric midpoint of event [JD]: 2460515.75330200 * magnitude of target star: 10.92 * magnitude drop [mag]: 6.79 * estimated maximum duration [s]: 1.880 * Moon: 90 % sunlit, 63° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.001", 83°) * approx speed of asteroid's shadow [km/s]: 10.8661 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G182811.8-180254 by 25270 1998 VR27 on 2024 Jul 24 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 152 0 0 0 7 19 6 14 31.5 1 108 24 0 13 9 0 1 29 0 15 23 - 0 0 44 0 10 59 0 3 40 .... 153 0 0 - 0 12 16 6 14 31.2 2 108 23 - 0 6 26 - 0 18 6 - 0 4 12 - 0 20 19 - 0 8 36 - 0 15 55 0.02 154 0 0 - 0 31 45 6 14 30.8 3 108 22 - 0 25 56 - 0 37 35 - 0 23 42 - 0 39 49 - 0 28 6 - 0 35 25 -0.01 155 0 0 - 0 51 10 6 14 30.2 4 108 21 - 0 45 20 - 0 56 59 - 0 43 7 - 0 59 13 - 0 47 31 - 0 54 49 -0.03 156 0 0 - 1 10 28 6 14 29.4 5 108 20 - 1 4 39 - 1 16 18 - 1 2 25 - 1 18 31 - 1 6 49 - 1 14 7 -0.04 157 0 0 - 1 29 40 6 14 28.4 6 108 19 - 1 23 51 - 1 35 30 - 1 21 38 - 1 37 43 - 1 26 2 - 1 33 19 -0.04 158 0 0 - 1 48 46 6 14 27.2 7 108 18 - 1 42 57 - 1 54 35 - 1 40 43 - 1 56 48 - 1 45 7 - 1 52 25 -0.04 159 0 0 - 2 7 44 6 14 25.9 8 108 17 - 2 1 55 - 2 13 33 - 1 59 42 - 2 15 46 - 2 4 6 - 2 11 23 -0.05 160 0 0 - 2 26 35 6 14 24.3 9 108 16 - 2 20 47 - 2 32 24 - 2 18 33 - 2 34 37 - 2 22 57 - 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5 29 6 5 56 49.2 36 252 -60 - 5 23 20 - 5 34 52 - 5 21 8 - 5 37 4 - 5 25 29 - 5 32 42 -0.06 - 59 0 0 - 5 12 1 5 56 43.2 35 252 -59 - 5 6 15 - 5 17 47 - 5 4 3 - 5 19 59 - 5 8 24 - 5 15 38 -0.06 - 58 0 0 - 4 54 46 5 56 37.4 34 252 -58 - 4 48 59 - 5 0 32 - 4 46 47 - 5 2 44 - 4 51 9 - 4 58 23 -0.06 - 57 0 0 - 4 37 20 5 56 31.7 33 252 -57 - 4 31 33 - 4 43 7 - 4 29 21 - 4 45 19 - 4 33 43 - 4 40 57 -0.06 - 56 0 0 - 4 19 45 5 56 26.2 32 251 -56 - 4 13 58 - 4 25 32 - 4 11 45 - 4 27 44 - 4 16 8 - 4 23 22 -0.06 - 55 0 0 - 4 2 0 5 56 20.8 31 251 -55 - 3 56 13 - 4 7 47 - 3 54 0 - 4 10 0 - 3 58 22 - 4 5 37 -0.06 - 54 0 0 - 3 44 6 5 56 15.5 30 251 -54 - 3 38 18 - 3 49 53 - 3 36 6 - 3 52 6 - 3 40 28 - 3 47 43 -0.06 - 53 0 0 - 3 26 2 5 56 10.4 29 251 -53 - 3 20 15 - 3 31 50 - 3 18 2 - 3 34 3 - 3 22 25 - 3 29 40 -0.06 - 52 0 0 - 3 7 51 5 56 5.5 27 251 -52 - 3 2 3 - 3 13 39 - 2 59 50 - 3 15 51 - 3 4 13 - 3 11 28 -0.06 - 51 0 0 - 2 49 30 5 56 0.7 26 251 -51 - 2 43 42 - 2 55 19 - 2 41 29 - 2 57 31 - 2 45 52 - 2 53 8 -0.06 - 50 0 0 - 2 31 2 5 55 56.1 25 251 -50 - 2 25 14 - 2 36 51 - 2 23 1 - 2 39 4 - 2 27 24 - 2 34 41 -0.06 - 49 0 0 - 2 12 27 5 55 51.7 24 251 -49 - 2 6 38 - 2 18 15 - 2 4 25 - 2 20 28 - 2 8 48 - 2 16 5 -0.06 - 48 0 0 - 1 53 44 5 55 47.4 23 251 -48 - 1 47 55 - 1 59 32 - 1 45 42 - 2 1 46 - 1 50 5 - 1 57 22 -0.06 - 47 0 0 - 1 34 54 5 55 43.3 22 251 -47 - 1 29 5 - 1 40 43 - 1 26 52 - 1 42 56 - 1 31 15 - 1 38 32 -0.06 - 46 0 0 - 1 15 58 5 55 39.4 21 251 -46 - 1 10 8 - 1 21 47 - 1 7 55 - 1 24 0 - 1 12 19 - 1 19 36 -0.06 - 45 0 0 - 0 56 55 5 55 35.6 20 251 -45 - 0 51 6 - 1 2 44 - 0 48 52 - 1 4 58 - 0 53 16 - 1 0 34 -0.06 - 44 0 0 - 0 37 47 5 55 32.0 19 251 -44 - 0 31 57 - 0 43 36 - 0 29 44 - 0 45 49 - 0 34 8 - 0 41 26 -0.06 - 43 0 0 - 0 18 33 5 55 28.6 18 251 -43 - 0 12 43 - 0 24 23 - 0 10 30 - 0 26 36 - 0 14 54 - 0 22 12 -0.06 - 42 0 0 0 0 46 5 55 25.4 17 251 -42 0 6 35 - 0 5 4 0 8 49 - 0 7 17 0 4 25 - 0 2 53 -0.06 - 41 0 0 0 20 9 5 55 22.3 16 251 -41 0 25 59 0 14 19 0 28 12 0 12 6 0 23 48 0 16 30 -0.06 - 40 0 0 0 39 37 5 55 19.4 15 251 -39 0 45 27 0 33 47 0 47 40 0 31 33 0 43 16 0 35 58 -0.06 - 39 0 0 0 59 8 5 55 16.8 14 251 -38 1 4 58 0 53 18 1 7 12 0 51 4 1 2 47 0 55 29 -0.06 - 38 0 0 1 18 43 5 55 14.3 13 251 -37 1 24 33 1 12 53 1 26 47 1 10 39 1 22 22 1 15 4 -0.06 - 37 0 0 1 38 21 5 55 11.9 12 251 -36 1 44 11 1 32 30 1 46 24 1 30 17 1 42 0 1 34 41 -0.06 - 36 0 0 1 58 1 5 55 9.8 11 251 -35 2 3 51 1 52 11 2 6 5 1 49 57 2 1 40 1 54 21 -0.06 - 35 0 0 2 17 43 5 55 7.9 10 251 -34 2 23 34 2 11 53 2 25 47 2 9 39 2 21 23 2 14 4 -0.06 - 34 0 0 2 37 28 5 55 6.1 9 251 -33 2 43 18 2 31 37 2 45 32 2 29 23 2 41 7 2 33 48 -0.06 - 33 0 0 2 57 13 5 55 4.6 8 251 -32 3 3 4 2 51 23 3 5 17 2 49 9 3 0 53 2 53 34 -0.06 - 32 0 0 3 16 59 5 55 3.2 7 251 -31 3 22 50 3 11 9 3 25 4 3 8 55 3 20 39 3 13 20 -0.05 - 31 0 0 3 36 46 5 55 2.1 6 251 -30 3 42 37 3 30 56 3 44 51 3 28 42 3 40 26 3 33 7 -0.05 - 30 0 0 3 56 33 5 55 1.1 5 252 -29 4 2 24 3 50 43 4 4 37 3 48 29 4 0 13 3 52 54 -0.05 - 29 0 0 4 16 19 5 55 0.3 4 252 -28 4 22 10 4 10 29 4 24 24 4 8 15 4 19 59 4 12 40 -0.04 - 28 0 0 4 36 5 5 54 59.7 3 252 -27 4 41 55 4 30 14 4 44 9 4 28 1 4 39 44 4 32 25 -0.03 - 27 0 0 4 55 49 5 54 59.4 2 252 -26 5 1 40 4 49 59 5 3 53 4 47 45 4 59 29 4 52 10 -0.01 - 26 0 0 5 15 32 5 54 59.2 0 252 -25 5 21 22 5 9 41 5 23 36 5 7 27 5 19 11 5 11 52 0.10 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: G182811.8-180254 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 28 11.8223 DE: -18 02 53.983 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 28 11.8223 DE: -18 02 53.983 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.700,0.500) * V mag [mag]: 10.9 * B mag [mag]: 13.7 * Diameter [mas]: 2.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (25270) 1998 VR27 asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.40040 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 25 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): 0.021", 0.001", 82.593° remarks: * orbital elements for (25270)1998 VR27 : Mean anomaly = 125.6343458107 deg Arg. of pericenter = 270.4991506786 deg Long. of node = 239.3363022801 deg Inclination = 5.3172107409 deg Eccentricity = 0.1007540409 Semimajor axis = 3.1433376003 AU Perihelion dist = 2.8266336353 AU Mag: H = 12.65, G = 0.15 Epoch of elements : MJD 60515.25330234 TDT (2024 Jul 24.2533) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr25,1.88,2024,7,24,6.079248,-0.002456,0.052104,-6.126489,-0.284885,0.002366,-0.000345,0.000001,0.000000 -116.2352,-18.0331,90.45,19.75,False G182811.8-180254,18.46995064,-18.0483287,13.71,10.92,9.41,2.2,4,,18.49420426,-18.0330990,6.80,7.85,0,0,0 25270,1998 VR27,17.71,20.415,2.4004,0,0,-1.573,-1.05,,1.2,0 0,125.5895,2024,7,24,270.4992,239.3363,5.3172,0.10075,3.14334,2.82663,12.65,5.0,0.15 1.191,0.0207,0.0015,83,0.0022,Known errors,1.01,0,-1,-1 20240724_180254,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org