メタデータ
| 項目 |
値 |
| Designation |
C/1987 B2 (Terasako) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1986-12-24T21:01:50.280960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1987-02-07.0000000 |
| e |
0.99522002 |
| q (au) |
0.392887 |
| a (au) |
82.194165 |
| i (deg) |
40.856893 |
| Ω (om, deg) |
97.699267 |
| ω (w, deg) |
195.270339 |
| M (ma, deg) |
0.058360 |
等級
散乱 + 全体線形
$$
M_a = (6.591 + 3.938\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.591 |
| n |
3.938 |
| gf |
0.984 |
| gb |
-1.000 |
| k |
0.962 |
| δ90 |
9.882 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
06:58:04.17 |
+27:54:09.3 |
HIP 33662 |
29.88 |
| 2026-05-12 12:00 |
06:58:05.54 |
+27:54:05.7 |
HIP 33662 |
29.72 |
| 2026-05-13 00:00 |
06:58:06.92 |
+27:54:02.0 |
HIP 33662 |
29.57 |
| 2026-05-13 12:00 |
06:58:08.32 |
+27:53:58.4 |
HIP 33662 |
29.41 |
| 2026-05-14 00:00 |
06:58:09.73 |
+27:53:54.7 |
HIP 33662 |
29.26 |
| 2026-05-14 12:00 |
06:58:11.16 |
+27:53:51.1 |
HIP 33662 |
29.10 |
| 2026-05-15 00:00 |
06:58:12.60 |
+27:53:47.4 |
HIP 33662 |
28.95 |
| 2026-05-15 12:00 |
06:58:14.06 |
+27:53:43.8 |
HIP 33662 |
28.80 |
| 2026-05-16 00:00 |
06:58:15.53 |
+27:53:40.1 |
HIP 33662 |
28.64 |
| 2026-05-16 12:00 |
06:58:17.01 |
+27:53:36.4 |
HIP 33662 |
28.49 |
| 2026-05-17 00:00 |
06:58:18.51 |
+27:53:32.8 |
HIP 33662 |
28.35 |
| 2026-05-17 12:00 |
06:58:20.02 |
+27:53:29.1 |
HIP 33662 |
28.20 |
| 2026-05-18 00:00 |
06:58:21.55 |
+27:53:25.4 |
HIP 33662 |
28.05 |
| 2026-05-18 12:00 |
06:58:23.09 |
+27:53:21.7 |
HIP 33662 |
27.91 |
| 2026-05-19 00:00 |
06:58:24.64 |
+27:53:18.1 |
HIP 33662 |
27.77 |
| 2026-05-19 12:00 |
06:58:26.20 |
+27:53:14.4 |
HIP 33662 |
27.63 |
| 2026-05-20 00:00 |
06:58:27.78 |
+27:53:10.7 |
HIP 33662 |
27.49 |
| 2026-05-20 12:00 |
06:58:29.37 |
+27:53:07.0 |
HIP 33662 |
27.36 |
| 2026-05-21 00:00 |
06:58:30.97 |
+27:53:03.3 |
HIP 33662 |
27.22 |
| 2026-05-21 12:00 |
06:58:32.59 |
+27:52:59.6 |
HIP 33662 |
27.09 |
| 2026-05-22 00:00 |
06:58:34.21 |
+27:52:55.9 |
HIP 33662 |
26.97 |
| 2026-05-22 12:00 |
06:58:35.85 |
+27:52:52.2 |
HIP 33662 |
26.84 |
| 2026-05-23 00:00 |
06:58:37.51 |
+27:52:48.5 |
HIP 33662 |
26.72 |
| 2026-05-23 12:00 |
06:58:39.17 |
+27:52:44.8 |
HIP 33662 |
26.60 |
| 2026-05-24 00:00 |
06:58:40.85 |
+27:52:41.1 |
HIP 33662 |
26.49 |
| 2026-05-24 12:00 |
06:58:42.53 |
+27:52:37.4 |
HIP 33662 |
26.38 |
| 2026-05-25 00:00 |
06:58:44.23 |
+27:52:33.7 |
HIP 33662 |
26.27 |
| 2026-05-25 12:00 |
06:58:45.95 |
+27:52:30.0 |
HIP 33662 |
26.17 |
| 2026-05-26 00:00 |
06:58:47.67 |
+27:52:26.3 |
HIP 33662 |
26.07 |
| 2026-05-26 12:00 |
06:58:49.40 |
+27:52:22.6 |
HIP 33662 |
25.98 |
| 2026-05-27 00:00 |
06:58:51.15 |
+27:52:19.0 |
HIP 33662 |
25.89 |
| 2026-05-27 12:00 |
06:58:52.90 |
+27:52:15.3 |
HIP 33662 |
25.81 |
| 2026-05-28 00:00 |
06:58:54.67 |
+27:52:11.6 |
HIP 33662 |
25.73 |
| 2026-05-28 12:00 |
06:58:56.45 |
+27:52:07.9 |
HIP 33662 |
25.65 |
| 2026-05-29 00:00 |
06:58:58.24 |
+27:52:04.2 |
HIP 33662 |
25.58 |
| 2026-05-29 12:00 |
06:59:00.04 |
+27:52:00.5 |
HIP 33662 |
25.52 |
| 2026-05-30 00:00 |
06:59:01.85 |
+27:51:56.8 |
HIP 33662 |
25.46 |
| 2026-05-30 12:00 |
06:59:03.67 |
+27:51:53.2 |
HIP 33662 |
25.41 |
| 2026-05-31 00:00 |
06:59:05.50 |
+27:51:49.5 |
HIP 33662 |
25.36 |
| 2026-05-31 12:00 |
06:59:07.34 |
+27:51:45.8 |
HIP 33662 |
25.32 |
| 2026-06-01 00:00 |
06:59:09.19 |
+27:51:42.2 |
HIP 33662 |
25.28 |
| 2026-06-01 12:00 |
06:59:11.05 |
+27:51:38.5 |
HIP 33662 |
25.25 |
| 2026-06-02 00:00 |
06:59:12.92 |
+27:51:34.8 |
HIP 33662 |
25.23 |