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) |
| 2026-07-29 00:00 |
01:42:34.20 |
-05:19:06.3 |
HIP 8047 |
16.55 |
| 2026-07-29 12:00 |
01:42:35.11 |
-05:19:44.9 |
HIP 8047 |
16.87 |
| 2026-07-30 00:00 |
01:42:35.94 |
-05:20:24.0 |
HIP 8047 |
17.23 |
| 2026-07-30 12:00 |
01:42:36.69 |
-05:21:03.5 |
HIP 8047 |
17.63 |
| 2026-07-31 00:00 |
01:42:37.35 |
-05:21:43.5 |
HIP 8047 |
18.07 |
| 2026-07-31 12:00 |
01:42:37.92 |
-05:22:24.0 |
HIP 8047 |
18.53 |
| 2026-08-01 00:00 |
01:42:38.41 |
-05:23:04.9 |
HIP 8047 |
19.03 |
| 2026-08-01 12:00 |
01:42:38.81 |
-05:23:46.3 |
HIP 8047 |
19.56 |
| 2026-08-02 00:00 |
01:42:39.13 |
-05:24:28.1 |
HIP 8091 |
19.29 |
| 2026-08-02 12:00 |
01:42:39.36 |
-05:25:10.4 |
HIP 8091 |
19.01 |
| 2026-08-03 00:00 |
01:42:39.50 |
-05:25:53.2 |
HIP 8091 |
18.76 |
| 2026-08-03 12:00 |
01:42:39.56 |
-05:26:36.3 |
HIP 8091 |
18.56 |
| 2026-08-04 00:00 |
01:42:39.53 |
-05:27:19.9 |
HIP 8091 |
18.41 |
| 2026-08-04 12:00 |
01:42:39.42 |
-05:28:04.0 |
HIP 8091 |
18.30 |
| 2026-08-05 00:00 |
01:42:39.22 |
-05:28:48.5 |
HIP 8091 |
18.25 |
| 2026-08-05 12:00 |
01:42:38.94 |
-05:29:33.4 |
HIP 8091 |
18.24 |
| 2026-08-06 00:00 |
01:42:38.57 |
-05:30:18.8 |
HIP 8091 |
18.28 |
| 2026-08-06 12:00 |
01:42:38.11 |
-05:31:04.6 |
HIP 8091 |
18.38 |
| 2026-08-07 00:00 |
01:42:37.56 |
-05:31:50.8 |
HIP 8091 |
18.53 |
| 2026-08-07 12:00 |
01:42:36.93 |
-05:32:37.4 |
HIP 8091 |
18.74 |
| 2026-08-08 00:00 |
01:42:36.22 |
-05:33:24.4 |
HIP 8091 |
19.00 |
| 2026-08-08 12:00 |
01:42:35.41 |
-05:34:11.9 |
HIP 8091 |
19.31 |
| 2026-08-09 00:00 |
01:42:34.52 |
-05:34:59.7 |
HIP 8091 |
19.67 |
| 2026-08-09 12:00 |
01:42:33.55 |
-05:35:48.0 |
HIP 8091 |
20.08 |
| 2026-08-10 00:00 |
01:42:32.49 |
-05:36:36.7 |
HIP 8091 |
20.54 |
| 2026-08-10 12:00 |
01:42:31.34 |
-05:37:25.7 |
HIP 8091 |
21.05 |
| 2026-08-11 00:00 |
01:42:30.10 |
-05:38:15.2 |
HIP 8091 |
21.60 |
| 2026-08-11 12:00 |
01:42:28.78 |
-05:39:05.0 |
HIP 8091 |
22.20 |
| 2026-08-12 00:00 |
01:42:27.37 |
-05:39:55.2 |
HIP 8091 |
22.84 |
| 2026-08-12 12:00 |
01:42:25.88 |
-05:40:45.8 |
HIP 8091 |
23.52 |
| 2026-08-13 00:00 |
01:42:24.30 |
-05:41:36.7 |
HIP 8091 |
24.23 |
| 2026-08-13 12:00 |
01:42:22.64 |
-05:42:28.1 |
HIP 8091 |
24.98 |
| 2026-08-14 00:00 |
01:42:20.89 |
-05:43:19.8 |
HIP 8091 |
25.77 |
| 2026-08-14 12:00 |
01:42:19.05 |
-05:44:11.8 |
HIP 8091 |
26.59 |
| 2026-08-15 00:00 |
01:42:17.13 |
-05:45:04.2 |
HIP 8091 |
27.44 |
| 2026-08-15 12:00 |
01:42:15.13 |
-05:45:56.9 |
HIP 8091 |
28.32 |
| 2026-08-16 00:00 |
01:42:13.04 |
-05:46:50.0 |
HIP 7852 |
29.20 |
| 2026-08-16 12:00 |
01:42:10.87 |
-05:47:43.4 |
HIP 7843 |
29.47 |
| 2026-08-17 00:00 |
01:42:08.61 |
-05:48:37.1 |
HIP 7843 |
28.43 |
| 2026-08-17 12:00 |
01:42:06.27 |
-05:49:31.2 |
HIP 7843 |
27.37 |
| 2026-08-18 00:00 |
01:42:03.84 |
-05:50:25.6 |
HIP 7843 |
26.30 |
| 2026-08-18 12:00 |
01:42:01.33 |
-05:51:20.3 |
HIP 7843 |
25.20 |
| 2026-08-19 00:00 |
01:41:58.74 |
-05:52:15.3 |
HIP 7843 |
24.10 |