メタデータ
| 項目 |
値 |
| Designation |
477P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-10-09T11:21:47.885760Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:43:16Z |
| Obs used |
320 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
40.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-08-08T13:03:54.432000Z |
| Discovery magnitude (MPC) |
21.00 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) |
2019-04-04.0000000 |
| e |
0.41596154 |
| q (au) |
1.756419 |
| a (au) |
3.007369 |
| i (deg) |
8.909359 |
| Ω (om, deg) |
59.208728 |
| ω (w, deg) |
305.889989 |
| M (ma, deg) |
33.360615 |
等級
散乱 + 全体線形
$$
M_a = (15.556 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.556 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
11:42:44.95 |
+13:20:27.0 |
HIP 57150 |
17.56 |
| 2026-03-26 12:00 |
11:42:23.43 |
+13:22:06.1 |
HIP 57150 |
18.98 |
| 2026-03-27 00:00 |
11:42:01.99 |
+13:23:43.6 |
HIP 57150 |
21.72 |
| 2026-03-27 12:00 |
11:41:40.63 |
+13:25:19.7 |
HIP 57007 |
22.81 |
| 2026-03-28 00:00 |
11:41:19.36 |
+13:26:54.2 |
HIP 57007 |
20.29 |
| 2026-03-28 12:00 |
11:40:58.18 |
+13:28:27.2 |
HIP 57007 |
19.03 |
| 2026-03-29 00:00 |
11:40:37.10 |
+13:29:58.6 |
HIP 57007 |
19.26 |
| 2026-03-29 12:00 |
11:40:16.11 |
+13:31:28.4 |
HIP 57007 |
20.90 |
| 2026-03-30 00:00 |
11:39:55.22 |
+13:32:56.7 |
HIP 57007 |
23.64 |
| 2026-03-30 12:00 |
11:39:34.44 |
+13:34:23.4 |
HIP 56782 |
26.46 |
| 2026-03-31 00:00 |
11:39:13.76 |
+13:35:48.5 |
HIP 56782 |
22.55 |
| 2026-03-31 12:00 |
11:38:53.20 |
+13:37:11.9 |
HIP 56782 |
19.31 |
| 2026-04-01 00:00 |
11:38:32.75 |
+13:38:33.8 |
HIP 56782 |
17.09 |
| 2026-04-01 12:00 |
11:38:12.42 |
+13:39:54.0 |
HIP 56782 |
16.27 |
| 2026-04-02 00:00 |
11:37:52.21 |
+13:41:12.6 |
HIP 56782 |
17.03 |
| 2026-04-02 12:00 |
11:37:32.13 |
+13:42:29.5 |
HIP 56782 |
19.15 |
| 2026-04-03 00:00 |
11:37:12.17 |
+13:43:44.7 |
HIP 56648 |
17.43 |
| 2026-04-03 12:00 |
11:36:52.35 |
+13:44:58.3 |
HIP 56648 |
15.87 |
| 2026-04-04 00:00 |
11:36:32.66 |
+13:46:10.2 |
HIP 56648 |
15.80 |
| 2026-04-04 12:00 |
11:36:13.10 |
+13:47:20.4 |
HIP 56648 |
17.20 |
| 2026-04-05 00:00 |
11:35:53.69 |
+13:48:28.9 |
HIP 56648 |
19.74 |
| 2026-04-05 12:00 |
11:35:34.42 |
+13:49:35.7 |
HIP 56648 |
23.01 |
| 2026-04-06 00:00 |
11:35:15.30 |
+13:50:40.8 |
HIP 56411 |
25.92 |
| 2026-04-06 12:00 |
11:34:56.32 |
+13:51:44.2 |
HIP 56411 |
23.57 |
| 2026-04-07 00:00 |
11:34:37.50 |
+13:52:45.9 |
HIP 56411 |
21.99 |
| 2026-04-07 12:00 |
11:34:18.84 |
+13:53:45.8 |
HIP 56411 |
21.32 |
| 2026-04-08 00:00 |
11:34:00.33 |
+13:54:44.0 |
HIP 56411 |
21.63 |
| 2026-04-08 12:00 |
11:33:41.98 |
+13:55:40.4 |
HIP 56411 |
22.83 |
| 2026-04-09 00:00 |
11:33:23.80 |
+13:56:35.1 |
HIP 56411 |
24.79 |
| 2026-04-09 12:00 |
11:33:05.78 |
+13:57:28.0 |
HIP 56411 |
27.31 |
| 2026-04-10 00:00 |
11:32:47.94 |
+13:58:19.2 |
HIP 56242 |
28.06 |
| 2026-04-10 12:00 |
11:32:30.26 |
+13:59:08.6 |
HIP 56242 |
25.25 |
| 2026-04-11 00:00 |
11:32:12.76 |
+13:59:56.2 |
HIP 56242 |
22.96 |
| 2026-04-11 12:00 |
11:31:55.44 |
+14:00:42.1 |
HIP 56242 |
21.34 |
| 2026-04-12 00:00 |
11:31:38.29 |
+14:01:26.2 |
HIP 56242 |
20.53 |
| 2026-04-12 12:00 |
11:31:21.33 |
+14:02:08.5 |
HIP 56119 |
17.28 |
| 2026-04-13 00:00 |
11:31:04.55 |
+14:02:49.0 |
HIP 56119 |
13.61 |
| 2026-04-13 12:00 |
11:30:47.96 |
+14:03:27.8 |
HIP 56112 |
10.15 |
| 2026-04-14 00:00 |
11:30:31.56 |
+14:04:04.7 |
HIP 56112 |
6.22 |
| 2026-04-14 12:00 |
11:30:15.35 |
+14:04:39.9 |
HIP 56112 |
2.64 |
| 2026-04-15 00:00 |
11:29:59.34 |
+14:05:13.3 |
HIP 56112 |
2.58 |
| 2026-04-15 12:00 |
11:29:43.52 |
+14:05:44.9 |
HIP 56112 |
6.05 |
| 2026-04-16 00:00 |
11:29:27.90 |
+14:06:14.6 |
HIP 56112 |
9.78 |