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
$$
M_a = (6.591 + 3.937\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.591 |
| n |
3.937 |
| gf |
0.983 |
| gb |
-1.000 |
| k |
0.962 |
| δ90 |
9.860 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
06:59:14.80 |
+27:51:31.2 |
HIP 33662 |
25.21 |
| 2026-06-03 00:00 |
06:59:16.68 |
+27:51:27.5 |
HIP 33662 |
25.20 |
| 2026-06-03 12:00 |
06:59:18.58 |
+27:51:23.9 |
HIP 33662 |
25.20 |
| 2026-06-04 00:00 |
06:59:20.49 |
+27:51:20.3 |
HIP 33662 |
25.20 |
| 2026-06-04 12:00 |
06:59:22.41 |
+27:51:16.6 |
HIP 33662 |
25.21 |
| 2026-06-05 00:00 |
06:59:24.33 |
+27:51:13.0 |
HIP 33662 |
25.23 |
| 2026-06-05 12:00 |
06:59:26.27 |
+27:51:09.4 |
HIP 33662 |
25.26 |
| 2026-06-06 00:00 |
06:59:28.21 |
+27:51:05.7 |
HIP 33696 |
25.27 |
| 2026-06-06 12:00 |
06:59:30.16 |
+27:51:02.1 |
HIP 33696 |
25.07 |
| 2026-06-07 00:00 |
06:59:32.12 |
+27:50:58.5 |
HIP 33696 |
24.89 |
| 2026-06-07 12:00 |
06:59:34.09 |
+27:50:54.9 |
HIP 33696 |
24.71 |
| 2026-06-08 00:00 |
06:59:36.07 |
+27:50:51.3 |
HIP 33696 |
24.53 |
| 2026-06-08 12:00 |
06:59:38.05 |
+27:50:47.8 |
HIP 33696 |
24.36 |
| 2026-06-09 00:00 |
06:59:40.05 |
+27:50:44.2 |
HIP 33696 |
24.20 |
| 2026-06-09 12:00 |
06:59:42.05 |
+27:50:40.6 |
HIP 33696 |
24.05 |
| 2026-06-10 00:00 |
06:59:44.06 |
+27:50:37.1 |
HIP 33696 |
23.90 |
| 2026-06-10 12:00 |
06:59:46.07 |
+27:50:33.5 |
HIP 33696 |
23.76 |
| 2026-06-11 00:00 |
06:59:48.10 |
+27:50:30.0 |
HIP 33696 |
23.63 |
| 2026-06-11 12:00 |
06:59:50.13 |
+27:50:26.4 |
HIP 33696 |
23.50 |
| 2026-06-12 00:00 |
06:59:52.16 |
+27:50:22.9 |
HIP 33696 |
23.39 |
| 2026-06-12 12:00 |
06:59:54.21 |
+27:50:19.4 |
HIP 33696 |
23.28 |
| 2026-06-13 00:00 |
06:59:56.26 |
+27:50:15.9 |
HIP 33696 |
23.18 |
| 2026-06-13 12:00 |
06:59:58.32 |
+27:50:12.4 |
HIP 33696 |
23.09 |
| 2026-06-14 00:00 |
07:00:00.39 |
+27:50:08.9 |
HIP 33696 |
23.00 |
| 2026-06-14 12:00 |
07:00:02.46 |
+27:50:05.4 |
HIP 33696 |
22.93 |
| 2026-06-15 00:00 |
07:00:04.54 |
+27:50:01.9 |
HIP 33696 |
22.87 |
| 2026-06-15 12:00 |
07:00:06.62 |
+27:49:58.4 |
HIP 33696 |
22.81 |
| 2026-06-16 00:00 |
07:00:08.71 |
+27:49:55.0 |
HIP 33696 |
22.77 |
| 2026-06-16 12:00 |
07:00:10.81 |
+27:49:51.6 |
HIP 33696 |
22.73 |
| 2026-06-17 00:00 |
07:00:12.91 |
+27:49:48.1 |
HIP 33696 |
22.71 |
| 2026-06-17 12:00 |
07:00:15.02 |
+27:49:44.7 |
HIP 33696 |
22.69 |
| 2026-06-18 00:00 |
07:00:17.13 |
+27:49:41.3 |
HIP 33696 |
22.69 |
| 2026-06-18 12:00 |
07:00:19.25 |
+27:49:37.9 |
HIP 33696 |
22.69 |
| 2026-06-19 00:00 |
07:00:21.37 |
+27:49:34.5 |
HIP 33696 |
22.71 |
| 2026-06-19 12:00 |
07:00:23.50 |
+27:49:31.2 |
HIP 33696 |
22.74 |
| 2026-06-20 00:00 |
07:00:25.63 |
+27:49:27.8 |
HIP 33696 |
22.77 |
| 2026-06-20 12:00 |
07:00:27.77 |
+27:49:24.5 |
HIP 33696 |
22.82 |
| 2026-06-21 00:00 |
07:00:29.91 |
+27:49:21.1 |
HIP 33696 |
22.87 |
| 2026-06-21 12:00 |
07:00:32.06 |
+27:49:17.8 |
HIP 33696 |
22.94 |
| 2026-06-22 00:00 |
07:00:34.21 |
+27:49:14.5 |
HIP 33696 |
23.02 |