メタデータ
| 項目 |
値 |
| Designation |
380P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-06-06T22:55:01.165440Z |
| Orbit solution date (soln_date, UTC) |
2023-02-06T22:13:34Z |
| Obs used |
266 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
20.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2011-07-27T11:29:39.984000Z |
| Discovery magnitude (MPC) |
22.90 G |
| 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) |
2018-10-25.0000000 |
| e |
0.32644250 |
| q (au) |
3.049709 |
| a (au) |
4.527763 |
| i (deg) |
8.234018 |
| Ω (om, deg) |
133.114129 |
| ω (w, deg) |
90.060499 |
| M (ma, deg) |
336.986963 |
等級
散乱 + 全体線形
$$
M_a = (9.299 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.299 |
| n |
6.000 |
| gf |
0.909 |
| gb |
-0.918 |
| k |
1.000 |
| δ90 |
5.576 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2018-01-16 |
2019-06-02 |
+10.1875 |
-5.048 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
05:42:39.52 |
+19:24:57.1 |
HIP 26826 |
13.53 |
| 2026-05-12 12:00 |
05:43:06.18 |
+19:25:35.4 |
HIP 26826 |
19.79 |
| 2026-05-13 00:00 |
05:43:32.91 |
+19:26:13.3 |
HIP 26826 |
26.09 |
| 2026-05-13 12:00 |
05:43:59.73 |
+19:26:50.7 |
HIP 27171 |
21.77 |
| 2026-05-14 00:00 |
05:44:26.63 |
+19:27:27.8 |
HIP 27171 |
15.65 |
| 2026-05-14 12:00 |
05:44:53.60 |
+19:28:04.4 |
HIP 27171 |
9.84 |
| 2026-05-15 00:00 |
05:45:20.64 |
+19:28:40.7 |
HIP 27171 |
5.48 |
| 2026-05-15 12:00 |
05:45:47.77 |
+19:29:16.5 |
HIP 27171 |
6.74 |
| 2026-05-16 00:00 |
05:46:14.96 |
+19:29:52.0 |
HIP 27171 |
11.98 |
| 2026-05-16 12:00 |
05:46:42.24 |
+19:30:27.0 |
HIP 27171 |
18.03 |
| 2026-05-17 00:00 |
05:47:09.58 |
+19:31:01.6 |
HIP 27171 |
24.30 |
| 2026-05-17 12:00 |
05:47:37.00 |
+19:31:35.8 |
HIP 27171 |
30.67 |
| 2026-05-18 00:00 |
05:48:04.48 |
+19:32:09.6 |
HIP 27465 |
30.38 |
| 2026-05-18 12:00 |
05:48:32.04 |
+19:32:43.0 |
HIP 27465 |
28.80 |
| 2026-05-19 00:00 |
05:48:59.67 |
+19:33:15.9 |
HIP 27465 |
28.66 |
| 2026-05-19 12:00 |
05:49:27.36 |
+19:33:48.4 |
HIP 27465 |
29.97 |
| 2026-05-20 00:00 |
05:49:55.13 |
+19:34:20.5 |
HIP 27697 |
27.73 |
| 2026-05-20 12:00 |
05:50:22.96 |
+19:34:52.2 |
HIP 27697 |
21.30 |
| 2026-05-21 00:00 |
05:50:50.85 |
+19:35:23.4 |
HIP 27697 |
15.00 |
| 2026-05-21 12:00 |
05:51:18.81 |
+19:35:54.2 |
HIP 27697 |
9.10 |
| 2026-05-22 00:00 |
05:51:46.84 |
+19:36:24.5 |
HIP 27697 |
5.27 |
| 2026-05-22 12:00 |
05:52:14.92 |
+19:36:54.5 |
HIP 27697 |
7.78 |
| 2026-05-23 00:00 |
05:52:43.07 |
+19:37:23.9 |
HIP 27697 |
13.48 |
| 2026-05-23 12:00 |
05:53:11.28 |
+19:37:53.0 |
HIP 27747 |
18.12 |
| 2026-05-24 00:00 |
05:53:39.56 |
+19:38:21.6 |
HIP 27965 |
19.32 |
| 2026-05-24 12:00 |
05:54:07.89 |
+19:38:49.8 |
HIP 27965 |
13.03 |
| 2026-05-25 00:00 |
05:54:36.28 |
+19:39:17.5 |
HIP 27965 |
7.44 |
| 2026-05-25 12:00 |
05:55:04.73 |
+19:39:44.8 |
HIP 27965 |
5.56 |
| 2026-05-26 00:00 |
05:55:33.24 |
+19:40:11.6 |
HIP 27965 |
9.84 |
| 2026-05-26 12:00 |
05:56:01.80 |
+19:40:38.0 |
HIP 27965 |
15.93 |
| 2026-05-27 00:00 |
05:56:30.42 |
+19:41:04.0 |
HIP 28046 |
19.53 |
| 2026-05-27 12:00 |
05:56:59.10 |
+19:41:29.5 |
HIP 28046 |
23.76 |
| 2026-05-28 00:00 |
05:57:27.83 |
+19:41:54.5 |
HIP 28046 |
28.97 |
| 2026-05-28 12:00 |
05:57:56.62 |
+19:42:19.1 |
HIP 28373 |
27.14 |
| 2026-05-29 00:00 |
05:58:25.46 |
+19:42:43.2 |
HIP 28373 |
21.11 |
| 2026-05-29 12:00 |
05:58:54.36 |
+19:43:06.9 |
HIP 28373 |
15.73 |
| 2026-05-30 00:00 |
05:59:23.30 |
+19:43:30.2 |
HIP 28373 |
11.91 |
| 2026-05-30 12:00 |
05:59:52.30 |
+19:43:52.9 |
HIP 28373 |
11.38 |
| 2026-05-31 00:00 |
06:00:21.35 |
+19:44:15.2 |
HIP 28495 |
9.06 |
| 2026-05-31 12:00 |
06:00:50.45 |
+19:44:37.1 |
HIP 28495 |
4.34 |
| 2026-06-01 00:00 |
06:01:19.60 |
+19:44:58.5 |
HIP 28495 |
7.05 |
| 2026-06-01 12:00 |
06:01:48.80 |
+19:45:19.4 |
HIP 28495 |
13.24 |
| 2026-06-02 00:00 |
06:02:18.05 |
+19:45:39.9 |
HIP 28691 |
16.85 |