メタデータ
| 項目 |
値 |
| Designation |
478P/ATLAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-05-01T18:15:32.791680Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T17:58:36Z |
| Obs used |
494 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
19.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2017-01-28T11:47:24Z |
| Discovery magnitude (MPC) |
20.80 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-08-06.0000000 |
| e |
0.34362489 |
| q (au) |
2.394062 |
| a (au) |
3.647398 |
| i (deg) |
12.523311 |
| Ω (om, deg) |
127.279868 |
| ω (w, deg) |
13.107152 |
| M (ma, deg) |
321.831235 |
等級
散乱 + 全体線形
$$
M_a = (14.333 + 5.191\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.333 |
| n |
5.191 |
| gf |
0.966 |
| gb |
-0.669 |
| k |
0.801 |
| δ90 |
1.339 |
| 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) |
| 2026-06-01 00:00 |
19:16:18.11 |
-15:03:52.4 |
HIP 94657 |
16.11 |
| 2026-06-01 12:00 |
19:16:04.72 |
-15:04:24.7 |
HIP 94657 |
15.14 |
| 2026-06-02 00:00 |
19:15:51.13 |
-15:04:57.8 |
HIP 94657 |
14.85 |
| 2026-06-02 12:00 |
19:15:37.34 |
-15:05:31.6 |
HIP 94657 |
15.31 |
| 2026-06-03 00:00 |
19:15:23.36 |
-15:06:06.2 |
HIP 94657 |
16.50 |
| 2026-06-03 12:00 |
19:15:09.18 |
-15:06:41.6 |
HIP 94657 |
18.29 |
| 2026-06-04 00:00 |
19:14:54.80 |
-15:07:17.6 |
HIP 94657 |
20.55 |
| 2026-06-04 12:00 |
19:14:40.24 |
-15:07:54.4 |
HIP 94657 |
23.17 |
| 2026-06-05 00:00 |
19:14:25.48 |
-15:08:32.0 |
HIP 94657 |
26.06 |
| 2026-06-05 12:00 |
19:14:10.54 |
-15:09:10.3 |
HIP 94657 |
29.15 |
| 2026-06-06 00:00 |
19:13:55.41 |
-15:09:49.3 |
HIP 94657 |
32.41 |
| 2026-06-06 12:00 |
19:13:40.10 |
-15:10:29.1 |
HIP 94657 |
35.79 |
| 2026-06-07 00:00 |
19:13:24.61 |
-15:11:09.6 |
HIP 94224 |
37.50 |
| 2026-06-07 12:00 |
19:13:08.94 |
-15:11:50.8 |
HIP 94224 |
33.92 |
| 2026-06-08 00:00 |
19:12:53.09 |
-15:12:32.7 |
HIP 94224 |
30.37 |
| 2026-06-08 12:00 |
19:12:37.07 |
-15:13:15.4 |
HIP 94224 |
26.87 |
| 2026-06-09 00:00 |
19:12:20.88 |
-15:13:58.8 |
HIP 94224 |
23.48 |
| 2026-06-09 12:00 |
19:12:04.52 |
-15:14:42.9 |
HIP 94224 |
20.27 |
| 2026-06-10 00:00 |
19:11:47.98 |
-15:15:27.7 |
HIP 94224 |
17.37 |
| 2026-06-10 12:00 |
19:11:31.29 |
-15:16:13.1 |
HIP 94224 |
15.01 |
| 2026-06-11 00:00 |
19:11:14.43 |
-15:16:59.3 |
HIP 94224 |
13.50 |
| 2026-06-11 12:00 |
19:10:57.42 |
-15:17:46.2 |
HIP 94224 |
13.18 |
| 2026-06-12 00:00 |
19:10:40.24 |
-15:18:33.8 |
HIP 94224 |
14.16 |
| 2026-06-12 12:00 |
19:10:22.92 |
-15:19:22.1 |
HIP 94224 |
16.24 |
| 2026-06-13 00:00 |
19:10:05.44 |
-15:20:11.0 |
HIP 94224 |
19.09 |
| 2026-06-13 12:00 |
19:09:47.81 |
-15:21:00.7 |
HIP 94224 |
22.44 |
| 2026-06-14 00:00 |
19:09:30.04 |
-15:21:50.9 |
HIP 93967 |
23.54 |
| 2026-06-14 12:00 |
19:09:12.13 |
-15:22:41.9 |
HIP 93967 |
19.88 |
| 2026-06-15 00:00 |
19:08:54.08 |
-15:23:33.5 |
HIP 93967 |
16.56 |
| 2026-06-15 12:00 |
19:08:35.89 |
-15:24:25.8 |
HIP 93967 |
13.86 |
| 2026-06-16 00:00 |
19:08:17.57 |
-15:25:18.7 |
HIP 93967 |
12.25 |
| 2026-06-16 12:00 |
19:07:59.13 |
-15:26:12.2 |
HIP 93967 |
12.19 |
| 2026-06-17 00:00 |
19:07:40.55 |
-15:27:06.4 |
HIP 93967 |
13.75 |
| 2026-06-17 12:00 |
19:07:21.86 |
-15:28:01.2 |
HIP 93967 |
16.49 |
| 2026-06-18 00:00 |
19:07:03.04 |
-15:28:56.7 |
HIP 93967 |
19.96 |
| 2026-06-18 12:00 |
19:06:44.11 |
-15:29:52.7 |
HIP 93763 |
18.02 |
| 2026-06-19 00:00 |
19:06:25.07 |
-15:30:49.3 |
HIP 93763 |
13.75 |
| 2026-06-19 12:00 |
19:06:05.92 |
-15:31:46.5 |
HIP 93763 |
9.85 |
| 2026-06-20 00:00 |
19:05:46.67 |
-15:32:44.4 |
HIP 93763 |
7.01 |
| 2026-06-20 12:00 |
19:05:27.31 |
-15:33:42.8 |
HIP 93763 |
6.79 |
| 2026-06-21 00:00 |
19:05:07.86 |
-15:34:41.7 |
HIP 93763 |
9.42 |
| 2026-06-21 12:00 |
19:04:48.31 |
-15:35:41.2 |
HIP 93763 |
13.32 |
| 2026-06-22 00:00 |
19:04:28.67 |
-15:36:41.3 |
HIP 93763 |
17.70 |