[Iaude] CBET 4983: 2014 UN_271
quai at eps.harvard.edu
quai at eps.harvard.edu
Mon Jun 21 08:14:12 EDT 2021
Electronic Telegram No. 4983
Central Bureau for Astronomical Telegrams
Mailing address: Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau at eps.harvard.edu (alternate cbat at iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
2014 UN_271
G. Bernstein and P. Bernardinelli, University of Pennsylvania, reported
astrometry spanning 20 nights from 2014 Oct. 20-2018 Nov. 8 of an asteroidal
object that they found in CCD exposures obtained with the 4.0-m reflector
at Cerro Tololo Interamerican Observatory in the course of the "Dark Energy
Survey", and which they reported as a previously unknown member of the Oort
Cloud. Selected observations from MPEC 2021-M53 are tabulated below.
Magnitudes were given as follows: 2014 Oct. 20.29 UT, r = 22.5; Nov. 4.12,
z = 22.0; Dec. 11.12, i = 21.9; 2015 Jan. 9.11, z = 22.8; Aug. 17.36, r =
22.2, g = 22.6; 2016 Jan. 11.09, r = 22.1; 11.10, g = 22.9; Oct. 1.30, r =
21.6, g = 22.0; 2017 Oct. 15.27, g = 22.0; 15.34, z = 21.2, r = 21.6; Dec.
15.18, r = 22.0, g = 22.4; 2018 Oct. 27.18, z = 21.4; Nov. 8.24, r = 21.6,
i = 21.6, g = 22.2.
2014 UT R.A. (2000) Decl. Mag.
Oct. 20.29435 1 34 35.01 -37 14 46.1 22.4
Nov. 4.12204 1 32 21.02 -37 23 21.1 21.9
Dec. 11.11568 1 27 54.83 -37 17 49.6 21.9
2015 UT R.A. (2000) Decl. Mag.
Jan. 9.10701 1 26 35.32 -36 51 38.7 22.8
Aug. 17.35747 1 46 47.50 -37 37 39.8 22.2
17.35883 1 46 47.51 -37 37 39.8 22.5
2016 UT R.A. (2000) Decl. Mag.
Jan. 11.09386 1 29 57.73 -38 50 26.0 22.1
11.09524 1 29 57.72 -38 50 25.9 22.8
Oct. 1.29899 1 46 40.18 -41 11 31.7 21.6
1.30036 1 46 40.17 -41 11 32.0 21.9
2017 UT R.A. (2000) Decl. Mag.
Oct. 15.27208 1 50 05.74 -43 57 07.3 21.9
15.33777 1 50 04.98 -43 57 11.8 21.2
15.33915 1 50 04.97 -43 57 11.8 21.6
Dec. 15.18042 1 39 59.83 -44 00 56.4 22.0
15.18181 1 39 59.82 -44 00 56.3 22.4
2018 UT R.A. (2000) Decl. Mag.
Oct. 27.17859 1 54 38.20 -46 52 42.8 21.4
Nov. 8.23513 1 52 05.91 -46 59 29.0 21.6
8.23651 1 52 05.89 -46 59 29.1 21.5
8.23789 1 52 05.88 -46 59 29.0 22.2
S. Deen (Simi Valley, CA, USA) writes that he has identified pre-discovery
images of 2014 UN_271 in publicly available CCD observations obtained (via
a program led by K. J. Meech, University of Hawaii) with the Canada-France-
Hawaii Telescope at Mauna Kea on 2014 Aug. 28; the object appeared completely
stellar in SDSS i-, r-, g-, and u-band exposures obtained in 0".9-1".0 seeing.
Deen reports magnitudes i = 21.7, r = 22.1-22.2 (two exposures), g = 23.0,
and u = 23.6 for 2014 UN_271 on that night, indicating a noticeably red
color (e.g., g-r = +0.8). Deen's astrometry is tabulated below.
2014 UT R.A. (2000) Decl. Mag.
Aug. 28.60113 1 41 25.15 -36 02 11.8 22.1
28.60381 1 41 25.15 -36 02 12.2 23.6
28.60641 1 41 25.11 -36 02 12.4 23.0
28.60906 1 41 25.10 -36 02 12.6 21.7
28.61174 1 41 25.09 -36 02 13.0 22.2
The following orbital elements by S. Nakano (CBAT) are from 37
observations spanning 2014 Aug. 28-2018 Nov. 8 (mean residual 0".07), with
corresponding original and future values of 1/a being +0.000040 and +0.000026
AU^-1, respectively. The eccentricity of the object with respect to the
solar-system barycenter is slightly hyperbolic from around 1994 (r = 53 AU;
e= 1.0000006) until around 2086 (r = 73 AU; e= 1.0000018). The object is
likely to be a comet from the outer edge of the Oort Cloud.
Epoch = 2031 Jan. 14.0 TT
T = 2031 Jan. 22.98348 TT Peri. = 326.32002
e = 1.0007146 Node = 190.02375 2000.0
q = 10.9504922 AU Incl. = 95.45473
The following ephemeris by the undersigned from the above orbital elements
uses photometric power-law parameters H = 4.0 and 2.5n = 7.5 for the
magnitudes. These parameters reasonably fit the reported magnitudes and
suggest a peak total apparent (visual) magnitude of around 17 during the
years surrounding perihelion.
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
2021 05 26 02 28.25 -50 18.8 20.517 20.277 74.9 2.8 20.4
2021 06 15 02 33.75 -50 52.1 20.284 20.204 84.0 2.9 20.3
2021 07 05 02 38.19 -51 40.1 20.046 20.131 93.3 2.9 20.3
2021 07 25 02 41.12 -52 39.7 19.821 20.057 102.0 2.8 20.3
2021 08 14 02 42.15 -53 45.9 19.627 19.984 109.3 2.7 20.2
2021 09 03 02 41.06 -54 52.7 19.478 19.911 114.1 2.7 20.2
2021 09 23 02 37.84 -55 53.1 19.383 19.838 115.7 2.6 20.2
2021 10 13 02 32.86 -56 40.1 19.345 19.765 113.6 2.7 20.2
2021 11 02 02 26.82 -57 08.5 19.359 19.692 108.2 2.7 20.1
2021 11 22 02 20.73 -57 15.6 19.415 19.619 100.5 2.8 20.1
2021 12 12 02 15.62 -57 02.4 19.496 19.546 91.4 2.9 20.1
2022 01 01 02 12.33 -56 32.6 19.583 19.473 82.1 2.9 20.1
2022 01 21 02 11.30 -55 52.3 19.656 19.400 73.5 2.8 20.1
2022 02 10 02 12.63 -55 08.1 19.697 19.327 66.7 2.7 20.1
2022 03 02 02 16.10 -54 26.5 19.694 19.254 62.4 2.6 20.1
2022 03 22 02 21.31 -53 53.0 19.640 19.181 61.3 2.6 20.1
2022 04 11 02 27.77 -53 32.2 19.535 19.108 63.5 2.7 20.1
2022 05 01 02 34.94 -53 27.0 19.384 19.036 68.4 2.8 20.0
2022 05 21 02 42.30 -53 39.3 19.197 18.963 75.2 3.0 20.0
2022 06 10 02 49.30 -54 09.5 18.988 18.890 83.0 3.1 20.0
2022 06 30 02 55.39 -54 56.4 18.772 18.818 91.0 3.1 19.9
2022 07 20 03 00.02 -55 57.4 18.566 18.745 98.6 3.1 19.9
2022 08 09 03 02.68 -57 07.9 18.386 18.673 104.9 3.0 19.9
2022 08 29 03 02.95 -58 21.9 18.242 18.600 109.3 2.9 19.8
2022 09 18 03 00.62 -59 32.1 18.145 18.528 110.9 2.9 19.8
2022 10 08 02 55.82 -60 30.5 18.097 18.456 109.6 2.9 19.8
2022 10 28 02 49.20 -61 10.5 18.094 18.383 105.4 3.0 19.8
2022 11 17 02 41.85 -61 27.7 18.128 18.311 99.2 3.1 19.8
2022 12 07 02 35.09 -61 21.5 18.184 18.239 91.6 3.1 19.8
2022 12 27 02 30.11 -60 55.1 18.247 18.167 83.8 3.1 19.8
2023 01 16 02 27.71 -60 14.3 18.300 18.095 76.5 3.0 19.7
2023 02 05 02 28.16 -59 26.4 18.327 18.023 70.6 3.0 19.7
2023 02 25 02 31.32 -58 38.7 18.318 17.951 66.8 2.9 19.7
2023 03 17 02 36.78 -57 57.9 18.267 17.880 65.7 2.9 19.7
2023 04 06 02 44.01 -57 29.0 18.172 17.808 67.2 3.0 19.7
2023 04 26 02 52.42 -57 15.8 18.038 17.736 71.0 3.1 19.6
2023 05 16 03 01.41 -57 21.0 17.874 17.665 76.5 3.2 19.6
2023 06 05 03 10.39 -57 45.3 17.691 17.593 82.8 3.3 19.6
2023 06 25 03 18.75 -58 28.3 17.502 17.522 89.4 3.3 19.5
2023 07 15 03 25.85 -59 28.0 17.322 17.451 95.6 3.3 19.5
2023 08 04 03 31.02 -60 40.5 17.162 17.380 100.7 3.3 19.5
2023 08 24 03 33.65 -62 00.1 17.033 17.309 104.2 3.2 19.4
2023 09 13 03 33.21 -63 19.7 16.940 17.238 105.6 3.2 19.4
2023 10 03 03 29.48 -64 30.9 16.888 17.167 104.6 3.2 19.4
2023 10 23 03 22.79 -65 25.6 16.871 17.096 101.4 3.3 19.4
2023 11 12 03 14.18 -65 57.2 16.884 17.026 96.6 3.3 19.4
2023 12 02 03 05.25 -66 02.7 16.915 16.955 90.7 3.3 19.4
2023 12 22 02 57.77 -65 43.5 16.951 16.885 84.5 3.3 19.4
2024 01 11 02 53.10 -65 05.0 16.978 16.815 78.8 3.3 19.3
2024 01 31 02 51.93 -64 14.7 16.985 16.745 74.3 3.2 19.3
2024 02 20 02 54.30 -63 21.0 16.963 16.675 71.4 3.2 19.3
2024 03 11 02 59.80 -62 31.4 16.907 16.605 70.7 3.2 19.3
2024 03 31 03 07.84 -61 52.0 16.818 16.535 71.9 3.3 19.3
2024 04 20 03 17.74 -61 27.7 16.699 16.465 74.9 3.4 19.2
2024 05 10 03 28.84 -61 21.5 16.557 16.396 79.1 3.5 19.2
2024 05 30 03 40.48 -61 35.2 16.403 16.327 83.9 3.5 19.2
2024 06 19 03 52.00 -62 09.0 16.247 16.258 88.8 3.6 19.1
2024 07 09 04 02.68 -63 01.7 16.099 16.189 93.3 3.6 19.1
2024 07 29 04 11.78 -64 10.5 15.968 16.120 96.8 3.6 19.1
2024 08 18 04 18.47 -65 30.8 15.862 16.051 99.0 3.6 19.0
2024 09 07 04 21.90 -66 56.4 15.783 15.983 99.6 3.6 19.0
2024 09 27 04 21.32 -68 19.4 15.734 15.914 98.6 3.6 19.0
2024 10 17 04 16.39 -69 31.1 15.710 15.846 96.1 3.6 19.0
2024 11 06 04 07.57 -70 22.6 15.704 15.778 92.5 3.6 19.0
2024 11 26 03 56.41 -70 47.4 15.709 15.711 88.3 3.6 19.0
2024 12 16 03 45.30 -70 43.5 15.715 15.643 84.0 3.6 18.9
2025 01 05 03 36.69 -70 13.7 15.711 15.576 80.3 3.6 18.9
2025 01 25 03 32.24 -69 25.1 15.690 15.508 77.6 3.6 18.9
2025 02 14 03 32.51 -68 26.7 15.647 15.442 76.2 3.6 18.9
2025 03 06 03 37.22 -67 27.2 15.580 15.375 76.3 3.6 18.9
2025 03 26 03 45.71 -66 34.1 15.490 15.308 77.7 3.6 18.8
2025 04 15 03 57.14 -65 53.2 15.382 15.242 80.1 3.7 18.8
2025 05 05 04 10.72 -65 28.7 15.263 15.176 83.1 3.8 18.8
2025 05 25 04 25.68 -65 23.1 15.141 15.110 86.3 3.8 18.7
2025 06 14 04 41.30 -65 37.7 15.022 15.044 89.3 3.9 18.7
2025 07 04 04 56.85 -66 12.2 14.914 14.979 91.7 3.9 18.7
2025 07 24 05 11.55 -67 05.3 14.822 14.914 93.3 3.9 18.7
2025 08 13 05 24.53 -68 14.0 14.748 14.849 93.7 3.9 18.6
2025 09 02 05 34.80 -69 34.2 14.694 14.784 93.2 3.9 18.6
2025 09 22 05 41.23 -71 00.1 14.657 14.720 91.6 3.9 18.6
2025 10 12 05 42.66 -72 24.2 14.633 14.656 89.4 3.9 18.6
2025 11 01 05 38.28 -73 37.8 14.614 14.592 86.8 3.9 18.6
2025 11 21 05 28.24 -74 31.3 14.595 14.528 84.2 3.9 18.5
2025 12 11 05 14.34 -74 56.8 14.568 14.465 82.1 3.9 18.5
2025 12 31 04 59.99 -74 50.7 14.528 14.402 80.7 3.9 18.5
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2021 CBAT
2021 June 21 (CBET 4983) Daniel W. E. Green
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