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) |
| 2026-03-26 00:00 |
05:08:42.90 |
+18:02:53.9 |
HIP 24000 |
15.09 |
| 2026-03-26 12:00 |
05:08:58.40 |
+18:03:54.8 |
HIP 24000 |
12.93 |
| 2026-03-27 00:00 |
05:09:14.05 |
+18:04:55.7 |
HIP 24000 |
11.65 |
| 2026-03-27 12:00 |
05:09:29.87 |
+18:05:56.6 |
HIP 24000 |
11.57 |
| 2026-03-28 00:00 |
05:09:45.84 |
+18:06:57.3 |
HIP 24000 |
12.75 |
| 2026-03-28 12:00 |
05:10:01.97 |
+18:07:58.0 |
HIP 24000 |
14.92 |
| 2026-03-29 00:00 |
05:10:18.26 |
+18:08:58.6 |
HIP 24000 |
17.74 |
| 2026-03-29 12:00 |
05:10:34.71 |
+18:09:59.2 |
HIP 24000 |
20.97 |
| 2026-03-30 00:00 |
05:10:51.31 |
+18:10:59.6 |
HIP 24251 |
22.77 |
| 2026-03-30 12:00 |
05:11:08.06 |
+18:12:00.0 |
HIP 24251 |
19.51 |
| 2026-03-31 00:00 |
05:11:24.97 |
+18:13:00.2 |
HIP 24251 |
16.59 |
| 2026-03-31 12:00 |
05:11:42.03 |
+18:14:00.4 |
HIP 24251 |
14.27 |
| 2026-04-01 00:00 |
05:11:59.24 |
+18:15:00.4 |
HIP 24251 |
12.91 |
| 2026-04-01 12:00 |
05:12:16.59 |
+18:16:00.3 |
HIP 24298 |
10.65 |
| 2026-04-02 00:00 |
05:12:34.10 |
+18:17:00.2 |
HIP 24298 |
8.73 |
| 2026-04-02 12:00 |
05:12:51.76 |
+18:18:00.0 |
HIP 24298 |
8.70 |
| 2026-04-03 00:00 |
05:13:09.56 |
+18:18:59.5 |
HIP 24298 |
10.60 |
| 2026-04-03 12:00 |
05:13:27.51 |
+18:19:59.0 |
HIP 24317 |
11.29 |
| 2026-04-04 00:00 |
05:13:45.61 |
+18:20:58.3 |
HIP 24317 |
13.17 |
| 2026-04-04 12:00 |
05:14:03.85 |
+18:21:57.5 |
HIP 24317 |
16.09 |
| 2026-04-05 00:00 |
05:14:22.23 |
+18:22:56.6 |
HIP 24435 |
14.68 |
| 2026-04-05 12:00 |
05:14:40.76 |
+18:23:55.6 |
HIP 24435 |
13.65 |
| 2026-04-06 00:00 |
05:14:59.42 |
+18:24:54.4 |
HIP 24435 |
14.08 |
| 2026-04-06 12:00 |
05:15:18.23 |
+18:25:53.0 |
HIP 24533 |
14.43 |
| 2026-04-07 00:00 |
05:15:37.18 |
+18:26:51.5 |
HIP 24533 |
11.79 |
| 2026-04-07 12:00 |
05:15:56.27 |
+18:27:49.9 |
HIP 24533 |
10.59 |
| 2026-04-08 00:00 |
05:16:15.50 |
+18:28:48.0 |
HIP 24612 |
7.15 |
| 2026-04-08 12:00 |
05:16:34.87 |
+18:29:46.1 |
HIP 24612 |
4.01 |
| 2026-04-09 00:00 |
05:16:54.37 |
+18:30:43.9 |
HIP 24612 |
5.02 |
| 2026-04-09 12:00 |
05:17:14.01 |
+18:31:41.6 |
HIP 24612 |
8.91 |
| 2026-04-10 00:00 |
05:17:33.79 |
+18:32:39.1 |
HIP 24612 |
13.39 |
| 2026-04-10 12:00 |
05:17:53.69 |
+18:33:36.4 |
HIP 24612 |
18.06 |
| 2026-04-11 00:00 |
05:18:13.74 |
+18:34:33.5 |
HIP 24612 |
22.82 |
| 2026-04-11 12:00 |
05:18:33.91 |
+18:35:30.5 |
HIP 24910 |
25.35 |
| 2026-04-12 00:00 |
05:18:54.22 |
+18:36:27.2 |
HIP 24910 |
20.56 |
| 2026-04-12 12:00 |
05:19:14.66 |
+18:37:23.8 |
HIP 24910 |
15.80 |
| 2026-04-13 00:00 |
05:19:35.23 |
+18:38:20.1 |
HIP 24910 |
11.16 |
| 2026-04-13 12:00 |
05:19:55.93 |
+18:39:16.3 |
HIP 24910 |
6.96 |
| 2026-04-14 00:00 |
05:20:16.76 |
+18:40:12.2 |
HIP 24910 |
4.70 |
| 2026-04-14 12:00 |
05:20:37.71 |
+18:41:07.9 |
HIP 24910 |
6.81 |
| 2026-04-15 00:00 |
05:20:58.79 |
+18:42:03.5 |
HIP 24910 |
11.05 |
| 2026-04-15 12:00 |
05:21:20.00 |
+18:42:58.7 |
HIP 25035 |
12.36 |
| 2026-04-16 00:00 |
05:21:41.33 |
+18:43:53.8 |
HIP 25035 |
10.52 |