メタデータ
| 項目 |
値 |
| Designation |
C/1986 V1 (Sorrells) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-03-09T15:47:46.700160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
360 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
13.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1987-02-24.0000000 |
| e |
0.99992595 |
| q (au) |
1.721158 |
| a (au) |
23244.336024 |
| i (deg) |
160.579825 |
| Ω (om, deg) |
74.802450 |
| ω (w, deg) |
70.233014 |
| M (ma, deg) |
359.999996 |
等級
散乱 + 全体線形
$$
M_a = (3.512 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.512 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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 |
| 1986-11-02 |
1986-12-29 |
+9.0293 |
-2.778 |
| 1986-12-29 |
1987-02-28 |
-7.9512 |
+1.990 |
| 1987-04-11 |
1987-09-20 |
-0.2477 |
-0.077 |
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 |
13:10:52.59 |
-24:01:46.1 |
HIP 64303 |
9.08 |
| 2026-03-26 12:00 |
13:10:50.66 |
-24:01:37.9 |
HIP 64303 |
9.16 |
| 2026-03-27 00:00 |
13:10:48.72 |
-24:01:29.7 |
HIP 64303 |
9.27 |
| 2026-03-27 12:00 |
13:10:46.78 |
-24:01:21.4 |
HIP 64303 |
9.39 |
| 2026-03-28 00:00 |
13:10:44.84 |
-24:01:12.9 |
HIP 64303 |
9.55 |
| 2026-03-28 12:00 |
13:10:42.89 |
-24:01:04.4 |
HIP 64303 |
9.72 |
| 2026-03-29 00:00 |
13:10:40.94 |
-24:00:55.8 |
HIP 64303 |
9.91 |
| 2026-03-29 12:00 |
13:10:38.99 |
-24:00:47.1 |
HIP 64303 |
10.12 |
| 2026-03-30 00:00 |
13:10:37.03 |
-24:00:38.4 |
HIP 64303 |
10.35 |
| 2026-03-30 12:00 |
13:10:35.07 |
-24:00:29.5 |
HIP 64303 |
10.60 |
| 2026-03-31 00:00 |
13:10:33.11 |
-24:00:20.5 |
HIP 64303 |
10.87 |
| 2026-03-31 12:00 |
13:10:31.14 |
-24:00:11.5 |
HIP 64303 |
11.15 |
| 2026-04-01 00:00 |
13:10:29.18 |
-24:00:02.4 |
HIP 64303 |
11.44 |
| 2026-04-01 12:00 |
13:10:27.21 |
-23:59:53.2 |
HIP 64303 |
11.75 |
| 2026-04-02 00:00 |
13:10:25.23 |
-23:59:43.9 |
HIP 64303 |
12.07 |
| 2026-04-02 12:00 |
13:10:23.26 |
-23:59:34.6 |
HIP 64303 |
12.40 |
| 2026-04-03 00:00 |
13:10:21.28 |
-23:59:25.1 |
HIP 64303 |
12.74 |
| 2026-04-03 12:00 |
13:10:19.31 |
-23:59:15.6 |
HIP 64303 |
13.09 |
| 2026-04-04 00:00 |
13:10:17.33 |
-23:59:06.0 |
HIP 64303 |
13.45 |
| 2026-04-04 12:00 |
13:10:15.35 |
-23:58:56.3 |
HIP 64303 |
13.82 |
| 2026-04-05 00:00 |
13:10:13.37 |
-23:58:46.5 |
HIP 64303 |
14.20 |
| 2026-04-05 12:00 |
13:10:11.38 |
-23:58:36.7 |
HIP 64303 |
14.59 |
| 2026-04-06 00:00 |
13:10:09.40 |
-23:58:26.8 |
HIP 64303 |
14.98 |
| 2026-04-06 12:00 |
13:10:07.41 |
-23:58:16.8 |
HIP 64303 |
15.37 |
| 2026-04-07 00:00 |
13:10:05.43 |
-23:58:06.7 |
HIP 64303 |
15.78 |
| 2026-04-07 12:00 |
13:10:03.44 |
-23:57:56.6 |
HIP 64303 |
16.19 |
| 2026-04-08 00:00 |
13:10:01.45 |
-23:57:46.3 |
HIP 64303 |
16.60 |
| 2026-04-08 12:00 |
13:09:59.47 |
-23:57:36.0 |
HIP 64303 |
17.02 |
| 2026-04-09 00:00 |
13:09:57.48 |
-23:57:25.7 |
HIP 64303 |
17.44 |
| 2026-04-09 12:00 |
13:09:55.49 |
-23:57:15.2 |
HIP 64303 |
17.87 |
| 2026-04-10 00:00 |
13:09:53.51 |
-23:57:04.7 |
HIP 64303 |
18.30 |
| 2026-04-10 12:00 |
13:09:51.52 |
-23:56:54.1 |
HIP 64135 |
18.03 |
| 2026-04-11 00:00 |
13:09:49.53 |
-23:56:43.5 |
HIP 64135 |
17.55 |
| 2026-04-11 12:00 |
13:09:47.55 |
-23:56:32.8 |
HIP 64135 |
17.06 |
| 2026-04-12 00:00 |
13:09:45.56 |
-23:56:22.0 |
HIP 64135 |
16.57 |
| 2026-04-12 12:00 |
13:09:43.58 |
-23:56:11.1 |
HIP 64135 |
16.08 |
| 2026-04-13 00:00 |
13:09:41.59 |
-23:56:00.2 |
HIP 64135 |
15.60 |
| 2026-04-13 12:00 |
13:09:39.61 |
-23:55:49.2 |
HIP 64135 |
15.11 |
| 2026-04-14 00:00 |
13:09:37.63 |
-23:55:38.2 |
HIP 64135 |
14.62 |
| 2026-04-14 12:00 |
13:09:35.65 |
-23:55:27.1 |
HIP 64135 |
14.13 |
| 2026-04-15 00:00 |
13:09:33.68 |
-23:55:15.9 |
HIP 64135 |
13.65 |
| 2026-04-15 12:00 |
13:09:31.70 |
-23:55:04.7 |
HIP 64135 |
13.16 |
| 2026-04-16 00:00 |
13:09:29.73 |
-23:54:53.4 |
HIP 64135 |
12.67 |