メタデータ
| 項目 |
値 |
| Designation |
C/1986 P1 (Wilson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-04-20T18:45:50.837760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
671 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
7.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1987-01-29.0000000 |
| e |
1.00031497 |
| q (au) |
1.199648 |
| a (au) |
-3808.824679 |
| i (deg) |
147.119168 |
| Ω (om, deg) |
111.665561 |
| ω (w, deg) |
238.308426 |
| M (ma, deg) |
-0.000343 |
等級
散乱 + 全体線形
$$
M_a = (5.249 + 3.962\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.249 |
| n |
3.962 |
| gf |
1.000 |
| gb |
-0.519 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1986-08-05 |
1987-04-20 |
+0.9682 |
-0.238 |
| 1987-04-21 |
1987-06-28 |
+2.8094 |
-0.131 |
| 1987-06-28 |
1988-01-13 |
-3.5539 |
+1.400 |
| 1988-01-13 |
1988-09-12 |
+0.4903 |
-0.605 |
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) |
| 2026-09-20 00:00 |
04:41:08.34 |
+44:02:08.2 |
HIP 21774 |
6.86 |
| 2026-09-20 12:00 |
04:41:07.56 |
+44:02:17.4 |
HIP 21774 |
6.66 |
| 2026-09-21 00:00 |
04:41:06.77 |
+44:02:26.5 |
HIP 21774 |
6.46 |
| 2026-09-21 12:00 |
04:41:05.95 |
+44:02:35.6 |
HIP 21774 |
6.25 |
| 2026-09-22 00:00 |
04:41:05.11 |
+44:02:44.6 |
HIP 21774 |
6.05 |
| 2026-09-22 12:00 |
04:41:04.25 |
+44:02:53.6 |
HIP 21774 |
5.84 |
| 2026-09-23 00:00 |
04:41:03.37 |
+44:03:02.5 |
HIP 21774 |
5.63 |
| 2026-09-23 12:00 |
04:41:02.47 |
+44:03:11.4 |
HIP 21774 |
5.41 |
| 2026-09-24 00:00 |
04:41:01.54 |
+44:03:20.2 |
HIP 21774 |
5.20 |
| 2026-09-24 12:00 |
04:41:00.60 |
+44:03:29.0 |
HIP 21774 |
4.98 |
| 2026-09-25 00:00 |
04:40:59.63 |
+44:03:37.7 |
HIP 21774 |
4.76 |
| 2026-09-25 12:00 |
04:40:58.65 |
+44:03:46.3 |
HIP 21774 |
4.53 |
| 2026-09-26 00:00 |
04:40:57.64 |
+44:03:54.9 |
HIP 21774 |
4.31 |
| 2026-09-26 12:00 |
04:40:56.61 |
+44:04:03.4 |
HIP 21774 |
4.08 |
| 2026-09-27 00:00 |
04:40:55.57 |
+44:04:11.9 |
HIP 21774 |
3.85 |
| 2026-09-27 12:00 |
04:40:54.50 |
+44:04:20.3 |
HIP 21774 |
3.61 |
| 2026-09-28 00:00 |
04:40:53.41 |
+44:04:28.7 |
HIP 21774 |
3.38 |
| 2026-09-28 12:00 |
04:40:52.30 |
+44:04:36.9 |
HIP 21774 |
3.14 |
| 2026-09-29 00:00 |
04:40:51.17 |
+44:04:45.2 |
HIP 21774 |
2.90 |
| 2026-09-29 12:00 |
04:40:50.02 |
+44:04:53.3 |
HIP 21774 |
2.66 |
| 2026-09-30 00:00 |
04:40:48.85 |
+44:05:01.4 |
HIP 21774 |
2.42 |
| 2026-09-30 12:00 |
04:40:47.66 |
+44:05:09.5 |
HIP 21774 |
2.17 |
| 2026-10-01 00:00 |
04:40:46.44 |
+44:05:17.4 |
HIP 21774 |
1.92 |
| 2026-10-01 12:00 |
04:40:45.21 |
+44:05:25.3 |
HIP 21774 |
1.68 |
| 2026-10-02 00:00 |
04:40:43.96 |
+44:05:33.2 |
HIP 21774 |
1.43 |
| 2026-10-02 12:00 |
04:40:42.69 |
+44:05:41.0 |
HIP 21774 |
1.18 |
| 2026-10-03 00:00 |
04:40:41.40 |
+44:05:48.7 |
HIP 21774 |
0.94 |
| 2026-10-03 12:00 |
04:40:40.08 |
+44:05:56.3 |
HIP 21774 |
0.71 |
| 2026-10-04 00:00 |
04:40:38.75 |
+44:06:03.9 |
HIP 21774 |
0.52 |
| 2026-10-04 12:00 |
04:40:37.40 |
+44:06:11.4 |
HIP 21774 |
0.43 |
| 2026-10-05 00:00 |
04:40:36.03 |
+44:06:18.8 |
HIP 21774 |
0.49 |
| 2026-10-05 12:00 |
04:40:34.64 |
+44:06:26.2 |
HIP 21774 |
0.67 |
| 2026-10-06 00:00 |
04:40:33.23 |
+44:06:33.5 |
HIP 21774 |
0.90 |
| 2026-10-06 12:00 |
04:40:31.80 |
+44:06:40.7 |
HIP 21774 |
1.16 |
| 2026-10-07 00:00 |
04:40:30.35 |
+44:06:47.8 |
HIP 21774 |
1.43 |
| 2026-10-07 12:00 |
04:40:28.88 |
+44:06:54.9 |
HIP 21774 |
1.70 |
| 2026-10-08 00:00 |
04:40:27.39 |
+44:07:01.9 |
HIP 21774 |
1.98 |
| 2026-10-08 12:00 |
04:40:25.88 |
+44:07:08.8 |
HIP 21774 |
2.27 |
| 2026-10-09 00:00 |
04:40:24.35 |
+44:07:15.7 |
HIP 21774 |
2.56 |
| 2026-10-09 12:00 |
04:40:22.81 |
+44:07:22.5 |
HIP 21774 |
2.85 |
| 2026-10-10 00:00 |
04:40:21.24 |
+44:07:29.2 |
HIP 21774 |
3.15 |
| 2026-10-10 12:00 |
04:40:19.66 |
+44:07:35.8 |
HIP 21774 |
3.45 |
| 2026-10-11 00:00 |
04:40:18.06 |
+44:07:42.3 |
HIP 21774 |
3.75 |