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) |
| 2026-09-20 00:00 |
07:05:51.85 |
+27:46:00.7 |
HIP 34222 |
17.87 |
| 2026-09-20 12:00 |
07:05:52.54 |
+27:46:02.6 |
HIP 34222 |
17.92 |
| 2026-09-21 00:00 |
07:05:53.21 |
+27:46:04.5 |
HIP 34222 |
17.97 |
| 2026-09-21 12:00 |
07:05:53.86 |
+27:46:06.4 |
HIP 34222 |
18.03 |
| 2026-09-22 00:00 |
07:05:54.49 |
+27:46:08.3 |
HIP 34222 |
18.08 |
| 2026-09-22 12:00 |
07:05:55.10 |
+27:46:10.3 |
HIP 34222 |
18.13 |
| 2026-09-23 00:00 |
07:05:55.70 |
+27:46:12.3 |
HIP 34222 |
18.19 |
| 2026-09-23 12:00 |
07:05:56.27 |
+27:46:14.3 |
HIP 34222 |
18.24 |
| 2026-09-24 00:00 |
07:05:56.83 |
+27:46:16.4 |
HIP 34222 |
18.30 |
| 2026-09-24 12:00 |
07:05:57.37 |
+27:46:18.5 |
HIP 34222 |
18.35 |
| 2026-09-25 00:00 |
07:05:57.89 |
+27:46:20.7 |
HIP 34222 |
18.41 |
| 2026-09-25 12:00 |
07:05:58.40 |
+27:46:22.9 |
HIP 34222 |
18.47 |
| 2026-09-26 00:00 |
07:05:58.88 |
+27:46:25.1 |
HIP 34222 |
18.52 |
| 2026-09-26 12:00 |
07:05:59.35 |
+27:46:27.3 |
HIP 34222 |
18.58 |
| 2026-09-27 00:00 |
07:05:59.80 |
+27:46:29.6 |
HIP 34222 |
18.64 |
| 2026-09-27 12:00 |
07:06:00.23 |
+27:46:31.9 |
HIP 34222 |
18.70 |
| 2026-09-28 00:00 |
07:06:00.64 |
+27:46:34.2 |
HIP 34222 |
18.75 |
| 2026-09-28 12:00 |
07:06:01.03 |
+27:46:36.6 |
HIP 34222 |
18.81 |
| 2026-09-29 00:00 |
07:06:01.40 |
+27:46:39.0 |
HIP 34222 |
18.87 |
| 2026-09-29 12:00 |
07:06:01.76 |
+27:46:41.5 |
HIP 34222 |
18.93 |
| 2026-09-30 00:00 |
07:06:02.09 |
+27:46:44.0 |
HIP 34222 |
18.98 |
| 2026-09-30 12:00 |
07:06:02.41 |
+27:46:46.5 |
HIP 34222 |
19.04 |
| 2026-10-01 00:00 |
07:06:02.71 |
+27:46:49.0 |
HIP 34222 |
19.10 |
| 2026-10-01 12:00 |
07:06:02.99 |
+27:46:51.6 |
HIP 34222 |
19.15 |
| 2026-10-02 00:00 |
07:06:03.25 |
+27:46:54.2 |
HIP 34222 |
19.21 |
| 2026-10-02 12:00 |
07:06:03.49 |
+27:46:56.8 |
HIP 34222 |
19.27 |
| 2026-10-03 00:00 |
07:06:03.72 |
+27:46:59.5 |
HIP 34222 |
19.32 |
| 2026-10-03 12:00 |
07:06:03.92 |
+27:47:02.2 |
HIP 34222 |
19.37 |
| 2026-10-04 00:00 |
07:06:04.10 |
+27:47:04.9 |
HIP 34222 |
19.43 |
| 2026-10-04 12:00 |
07:06:04.27 |
+27:47:07.7 |
HIP 34222 |
19.48 |
| 2026-10-05 00:00 |
07:06:04.41 |
+27:47:10.5 |
HIP 34222 |
19.54 |
| 2026-10-05 12:00 |
07:06:04.54 |
+27:47:13.3 |
HIP 34222 |
19.59 |
| 2026-10-06 00:00 |
07:06:04.65 |
+27:47:16.2 |
HIP 34222 |
19.64 |
| 2026-10-06 12:00 |
07:06:04.74 |
+27:47:19.1 |
HIP 34222 |
19.69 |
| 2026-10-07 00:00 |
07:06:04.81 |
+27:47:22.0 |
HIP 34222 |
19.74 |
| 2026-10-07 12:00 |
07:06:04.85 |
+27:47:24.9 |
HIP 34222 |
19.79 |
| 2026-10-08 00:00 |
07:06:04.88 |
+27:47:27.9 |
HIP 34222 |
19.84 |
| 2026-10-08 12:00 |
07:06:04.90 |
+27:47:30.9 |
HIP 34222 |
19.89 |
| 2026-10-09 00:00 |
07:06:04.89 |
+27:47:34.0 |
HIP 34222 |
19.94 |
| 2026-10-09 12:00 |
07:06:04.86 |
+27:47:37.0 |
HIP 34222 |
19.99 |
| 2026-10-10 00:00 |
07:06:04.81 |
+27:47:40.1 |
HIP 34222 |
20.04 |
| 2026-10-10 12:00 |
07:06:04.74 |
+27:47:43.3 |
HIP 34222 |
20.08 |
| 2026-10-11 00:00 |
07:06:04.66 |
+27:47:46.4 |
HIP 34222 |
20.13 |