P/2017 B4 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2017 B4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-01-27T01:22:50.808000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:29Z |
| Obs used |
88 |
| NEO |
- |
| M1 |
14.900 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-02-03.0000000 |
| e |
0.35772410 |
| q (au) |
2.817043 |
| a (au) |
4.386033 |
| i (deg) |
20.183452 |
| Ω (om, deg) |
121.547652 |
| ω (w, deg) |
16.175862 |
| M (ma, deg) |
0.744921 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
10:29:53.29 |
+24:22:00.1 |
HIP 51377 |
24.08 |
| 2026-02-03 12:00 |
10:29:39.69 |
+24:27:51.4 |
HIP 51377 |
29.62 |
| 2026-02-04 00:00 |
10:29:25.85 |
+24:33:42.3 |
HIP 51267 |
24.62 |
| 2026-02-04 12:00 |
10:29:11.78 |
+24:39:32.7 |
HIP 51267 |
18.07 |
| 2026-02-05 00:00 |
10:28:57.49 |
+24:45:22.4 |
HIP 51267 |
11.60 |
| 2026-02-05 12:00 |
10:28:42.97 |
+24:51:11.4 |
HIP 51267 |
5.61 |
| 2026-02-06 00:00 |
10:28:28.24 |
+24:56:59.6 |
HIP 51267 |
4.19 |
| 2026-02-06 12:00 |
10:28:13.29 |
+25:02:47.1 |
HIP 51267 |
9.65 |
| 2026-02-07 00:00 |
10:27:58.14 |
+25:08:33.6 |
HIP 51267 |
16.08 |
| 2026-02-07 12:00 |
10:27:42.79 |
+25:14:19.1 |
HIP 51152 |
20.36 |
| 2026-02-08 00:00 |
10:27:27.24 |
+25:20:03.5 |
HIP 51260 |
17.94 |
| 2026-02-08 12:00 |
10:27:11.50 |
+25:25:46.9 |
HIP 51260 |
16.72 |
| 2026-02-09 00:00 |
10:26:55.58 |
+25:31:29.0 |
HIP 51094 |
15.21 |
| 2026-02-09 12:00 |
10:26:39.48 |
+25:37:09.9 |
HIP 51094 |
8.48 |
| 2026-02-10 00:00 |
10:26:23.20 |
+25:42:49.4 |
HIP 51094 |
1.82 |
| 2026-02-10 12:00 |
10:26:06.76 |
+25:48:27.6 |
HIP 51094 |
5.08 |
| 2026-02-11 00:00 |
10:25:50.17 |
+25:54:04.2 |
HIP 51094 |
11.80 |
| 2026-02-11 12:00 |
10:25:33.41 |
+25:59:39.3 |
HIP 51094 |
18.53 |
| 2026-02-12 00:00 |
10:25:16.51 |
+26:05:12.7 |
HIP 51094 |
25.26 |
| 2026-02-12 12:00 |
10:24:59.47 |
+26:10:44.5 |
HIP 51119 |
30.54 |
| 2026-02-13 00:00 |
10:24:42.30 |
+26:16:14.5 |
HIP 51119 |
30.34 |
| 2026-02-13 12:00 |
10:24:24.99 |
+26:21:42.6 |
HIP 51119 |
31.63 |
| 2026-02-14 00:00 |
10:24:07.57 |
+26:27:08.8 |
HIP 50878 |
30.58 |
| 2026-02-14 12:00 |
10:23:50.03 |
+26:32:33.1 |
HIP 50878 |
24.21 |
| 2026-02-15 00:00 |
10:23:32.38 |
+26:37:55.3 |
HIP 50878 |
18.09 |
| 2026-02-15 12:00 |
10:23:14.64 |
+26:43:15.5 |
HIP 50878 |
12.59 |
| 2026-02-16 00:00 |
10:22:56.80 |
+26:48:33.4 |
HIP 50878 |
8.85 |
| 2026-02-16 12:00 |
10:22:38.87 |
+26:53:49.1 |
HIP 50878 |
9.30 |
| 2026-02-17 00:00 |
10:22:20.87 |
+26:59:02.5 |
HIP 50878 |
13.50 |
| 2026-02-17 12:00 |
10:22:02.79 |
+27:04:13.6 |
HIP 50700 |
16.11 |
| 2026-02-18 00:00 |
10:21:44.65 |
+27:09:22.2 |
HIP 50700 |
17.93 |
| 2026-02-18 12:00 |
10:21:26.46 |
+27:14:28.3 |
HIP 50700 |
21.61 |
| 2026-02-19 00:00 |
10:21:08.21 |
+27:19:31.9 |
HIP 50686 |
24.31 |
| 2026-02-19 12:00 |
10:20:49.92 |
+27:24:32.8 |
HIP 50686 |
19.51 |
| 2026-02-20 00:00 |
10:20:31.60 |
+27:29:31.1 |
HIP 50686 |
15.96 |
| 2026-02-20 12:00 |
10:20:13.25 |
+27:34:26.7 |
HIP 50686 |
14.57 |
| 2026-02-21 00:00 |
10:19:54.88 |
+27:39:19.5 |
HIP 50686 |
15.87 |
| 2026-02-21 12:00 |
10:19:36.50 |
+27:44:09.4 |
HIP 50686 |
19.28 |
| 2026-02-22 00:00 |
10:19:18.12 |
+27:48:56.5 |
HIP 50451 |
23.74 |
| 2026-02-22 12:00 |
10:18:59.73 |
+27:53:40.7 |
HIP 50392 |
23.67 |
| 2026-02-23 00:00 |
10:18:41.36 |
+27:58:21.8 |
HIP 50392 |
18.15 |
| 2026-02-23 12:00 |
10:18:23.01 |
+28:03:00.0 |
HIP 50392 |
13.25 |
| 2026-02-24 00:00 |
10:18:04.68 |
+28:07:35.1 |
HIP 50392 |
9.86 |