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
$$
M_a = (14.334 + 5.191\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.334 |
| n |
5.191 |
| gf |
0.938 |
| gb |
-0.669 |
| k |
0.800 |
| δ90 |
1.335 |
| 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) |
| 2026-03-26 00:00 |
19:11:22.65 |
-15:32:28.4 |
HIP 94248 |
23.11 |
| 2026-03-26 12:00 |
19:11:39.60 |
-15:31:46.4 |
HIP 94248 |
24.83 |
| 2026-03-27 00:00 |
19:11:56.37 |
-15:31:04.5 |
HIP 94248 |
27.06 |
| 2026-03-27 12:00 |
19:12:12.94 |
-15:30:22.8 |
HIP 94248 |
29.66 |
| 2026-03-28 00:00 |
19:12:29.32 |
-15:29:41.2 |
HIP 94248 |
32.53 |
| 2026-03-28 12:00 |
19:12:45.51 |
-15:28:59.8 |
HIP 94248 |
35.58 |
| 2026-03-29 00:00 |
19:13:01.50 |
-15:28:18.6 |
HIP 94248 |
38.76 |
| 2026-03-29 12:00 |
19:13:17.30 |
-15:27:37.5 |
HIP 94224 |
41.98 |
| 2026-03-30 00:00 |
19:13:32.91 |
-15:26:56.6 |
HIP 94224 |
44.84 |
| 2026-03-30 12:00 |
19:13:48.32 |
-15:26:16.0 |
HIP 94657 |
45.33 |
| 2026-03-31 00:00 |
19:14:03.53 |
-15:25:35.5 |
HIP 94657 |
42.63 |
| 2026-03-31 12:00 |
19:14:18.55 |
-15:24:55.2 |
HIP 94657 |
40.13 |
| 2026-04-01 00:00 |
19:14:33.36 |
-15:24:15.1 |
HIP 94657 |
37.86 |
| 2026-04-01 12:00 |
19:14:47.98 |
-15:23:35.2 |
HIP 94657 |
35.82 |
| 2026-04-02 00:00 |
19:15:02.40 |
-15:22:55.6 |
HIP 94657 |
34.06 |
| 2026-04-02 12:00 |
19:15:16.61 |
-15:22:16.2 |
HIP 94657 |
32.61 |
| 2026-04-03 00:00 |
19:15:30.63 |
-15:21:37.0 |
HIP 94657 |
31.48 |
| 2026-04-03 12:00 |
19:15:44.44 |
-15:20:58.1 |
HIP 94657 |
30.71 |
| 2026-04-04 00:00 |
19:15:58.04 |
-15:20:19.4 |
HIP 94657 |
30.30 |
| 2026-04-04 12:00 |
19:16:11.44 |
-15:19:41.0 |
HIP 94657 |
30.25 |
| 2026-04-05 00:00 |
19:16:24.64 |
-15:19:02.9 |
HIP 94657 |
30.54 |
| 2026-04-05 12:00 |
19:16:37.63 |
-15:18:25.0 |
HIP 94657 |
31.15 |
| 2026-04-06 00:00 |
19:16:50.41 |
-15:17:47.4 |
HIP 94657 |
32.05 |
| 2026-04-06 12:00 |
19:17:02.98 |
-15:17:10.1 |
HIP 94929 |
31.97 |
| 2026-04-07 00:00 |
19:17:15.34 |
-15:16:33.1 |
HIP 94929 |
29.69 |
| 2026-04-07 12:00 |
19:17:27.50 |
-15:15:56.4 |
HIP 94929 |
27.60 |
| 2026-04-08 00:00 |
19:17:39.43 |
-15:15:20.0 |
HIP 94929 |
25.72 |
| 2026-04-08 12:00 |
19:17:51.16 |
-15:14:44.0 |
HIP 94929 |
24.08 |
| 2026-04-09 00:00 |
19:18:02.67 |
-15:14:08.2 |
HIP 94929 |
22.73 |
| 2026-04-09 12:00 |
19:18:13.97 |
-15:13:32.8 |
HIP 94929 |
21.68 |
| 2026-04-10 00:00 |
19:18:25.05 |
-15:12:57.8 |
HIP 94929 |
20.97 |
| 2026-04-10 12:00 |
19:18:35.92 |
-15:12:23.1 |
HIP 94929 |
20.61 |
| 2026-04-11 00:00 |
19:18:46.57 |
-15:11:48.7 |
HIP 94929 |
20.60 |
| 2026-04-11 12:00 |
19:18:57.00 |
-15:11:14.7 |
HIP 94929 |
20.92 |
| 2026-04-12 00:00 |
19:19:07.21 |
-15:10:41.1 |
HIP 94929 |
21.54 |
| 2026-04-12 12:00 |
19:19:17.19 |
-15:10:07.9 |
HIP 94929 |
22.40 |
| 2026-04-13 00:00 |
19:19:26.96 |
-15:09:35.0 |
HIP 94929 |
23.48 |
| 2026-04-13 12:00 |
19:19:36.51 |
-15:09:02.6 |
HIP 94929 |
24.72 |
| 2026-04-14 00:00 |
19:19:45.83 |
-15:08:30.5 |
HIP 94929 |
26.08 |
| 2026-04-14 12:00 |
19:19:54.92 |
-15:07:58.9 |
HIP 94929 |
27.54 |
| 2026-04-15 00:00 |
19:20:03.79 |
-15:07:27.7 |
HIP 94929 |
29.07 |
| 2026-04-15 12:00 |
19:20:12.44 |
-15:06:56.9 |
HIP 94929 |
30.64 |
| 2026-04-16 00:00 |
19:20:20.86 |
-15:06:26.6 |
HIP 94929 |
32.24 |