メタデータ
| 項目 |
値 |
| Designation |
P/2021 J3 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-07-03T16:55:29.046720Z |
| Orbit solution date (soln_date, UTC) |
2024-03-19T12:13:27Z |
| Obs used |
145 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
10.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-05-13T13:05:15.216000Z |
| Discovery magnitude (MPC) |
18.64 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-07-10.0000000 |
| e |
0.45076663 |
| q (au) |
4.906343 |
| a (au) |
8.933076 |
| i (deg) |
14.570678 |
| Ω (om, deg) |
111.238530 |
| ω (w, deg) |
125.692921 |
| M (ma, deg) |
27.217217 |
等級
散乱 + 全体線形
$$
M_a = (2.613 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.613 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.969 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
01:36:36.89 |
-06:57:11.2 |
HIP 7576 |
18.57 |
| 2026-09-20 12:00 |
01:36:29.79 |
-06:58:13.3 |
HIP 7576 |
20.59 |
| 2026-09-21 00:00 |
01:36:22.64 |
-06:59:15.3 |
HIP 7576 |
22.63 |
| 2026-09-21 12:00 |
01:36:15.44 |
-07:00:17.1 |
HIP 7576 |
24.67 |
| 2026-09-22 00:00 |
01:36:08.20 |
-07:01:18.8 |
HIP 7576 |
26.73 |
| 2026-09-22 12:00 |
01:36:00.91 |
-07:02:20.4 |
HIP 7350 |
27.44 |
| 2026-09-23 00:00 |
01:35:53.57 |
-07:03:21.8 |
HIP 7350 |
25.47 |
| 2026-09-23 12:00 |
01:35:46.20 |
-07:04:23.1 |
HIP 7350 |
23.50 |
| 2026-09-24 00:00 |
01:35:38.77 |
-07:05:24.2 |
HIP 7350 |
21.56 |
| 2026-09-24 12:00 |
01:35:31.31 |
-07:06:25.2 |
HIP 7350 |
19.64 |
| 2026-09-25 00:00 |
01:35:23.80 |
-07:07:25.9 |
HIP 7350 |
17.77 |
| 2026-09-25 12:00 |
01:35:16.25 |
-07:08:26.5 |
HIP 7350 |
15.95 |
| 2026-09-26 00:00 |
01:35:08.66 |
-07:09:26.9 |
HIP 7350 |
14.23 |
| 2026-09-26 12:00 |
01:35:01.03 |
-07:10:27.1 |
HIP 7350 |
12.62 |
| 2026-09-27 00:00 |
01:34:53.37 |
-07:11:27.1 |
HIP 7350 |
11.21 |
| 2026-09-27 12:00 |
01:34:45.66 |
-07:12:26.9 |
HIP 7350 |
10.05 |
| 2026-09-28 00:00 |
01:34:37.92 |
-07:13:26.5 |
HIP 7350 |
9.27 |
| 2026-09-28 12:00 |
01:34:30.14 |
-07:14:25.9 |
HIP 7350 |
8.96 |
| 2026-09-29 00:00 |
01:34:22.33 |
-07:15:25.0 |
HIP 7350 |
9.17 |
| 2026-09-29 12:00 |
01:34:14.48 |
-07:16:23.9 |
HIP 7350 |
9.88 |
| 2026-09-30 00:00 |
01:34:06.60 |
-07:17:22.5 |
HIP 7350 |
11.00 |
| 2026-09-30 12:00 |
01:33:58.68 |
-07:18:21.0 |
HIP 7350 |
12.41 |
| 2026-10-01 00:00 |
01:33:50.74 |
-07:19:19.1 |
HIP 7350 |
14.03 |
| 2026-10-01 12:00 |
01:33:42.76 |
-07:20:17.0 |
HIP 7350 |
15.80 |
| 2026-10-02 00:00 |
01:33:34.75 |
-07:21:14.6 |
HIP 7350 |
17.67 |
| 2026-10-02 12:00 |
01:33:26.71 |
-07:22:12.0 |
HIP 7350 |
19.62 |
| 2026-10-03 00:00 |
01:33:18.65 |
-07:23:09.1 |
HIP 7350 |
21.63 |
| 2026-10-03 12:00 |
01:33:10.56 |
-07:24:05.8 |
HIP 7350 |
23.68 |
| 2026-10-04 00:00 |
01:33:02.44 |
-07:25:02.3 |
HIP 7276 |
25.56 |
| 2026-10-04 12:00 |
01:32:54.29 |
-07:25:58.5 |
HIP 7276 |
27.26 |
| 2026-10-05 00:00 |
01:32:46.12 |
-07:26:54.4 |
HIP 7276 |
29.02 |
| 2026-10-05 12:00 |
01:32:37.93 |
-07:27:49.9 |
HIP 7276 |
30.84 |
| 2026-10-06 00:00 |
01:32:29.71 |
-07:28:45.1 |
HIP 7276 |
32.71 |
| 2026-10-06 12:00 |
01:32:21.48 |
-07:29:40.0 |
HIP 7075 |
32.79 |
| 2026-10-07 00:00 |
01:32:13.22 |
-07:30:34.6 |
HIP 7075 |
32.54 |
| 2026-10-07 12:00 |
01:32:04.94 |
-07:31:28.8 |
HIP 7075 |
32.43 |
| 2026-10-08 00:00 |
01:31:56.64 |
-07:32:22.6 |
HIP 7075 |
32.47 |
| 2026-10-08 12:00 |
01:31:48.33 |
-07:33:16.1 |
HIP 7075 |
32.66 |
| 2026-10-09 00:00 |
01:31:40.00 |
-07:34:09.3 |
HIP 7038 |
32.96 |
| 2026-10-09 12:00 |
01:31:31.65 |
-07:35:02.0 |
HIP 7038 |
31.34 |
| 2026-10-10 00:00 |
01:31:23.29 |
-07:35:54.4 |
HIP 7038 |
29.81 |
| 2026-10-10 12:00 |
01:31:14.92 |
-07:36:46.3 |
HIP 7038 |
28.38 |
| 2026-10-11 00:00 |
01:31:06.54 |
-07:37:37.9 |
HIP 7038 |
27.06 |