メタデータ
| 項目 |
値 |
| Designation |
C/1981 H1 (Bus) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1981-07-30T18:36:24.347520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
26 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1981-06-01.0000000 |
| e |
0.99886154 |
| q (au) |
2.458094 |
| a (au) |
2159.137236 |
| i (deg) |
160.663680 |
| Ω (om, deg) |
24.264517 |
| ω (w, deg) |
189.851632 |
| M (ma, deg) |
359.999413 |
等級
散乱 + 全体線形
$$
M_a = (17.833 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.833 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.864 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
02:21:16.12 |
+09:58:01.0 |
HIP 10937 |
6.23 |
| 2026-07-29 12:00 |
02:21:16.11 |
+09:57:59.4 |
HIP 10937 |
6.23 |
| 2026-07-30 00:00 |
02:21:16.08 |
+09:57:57.7 |
HIP 10937 |
6.24 |
| 2026-07-30 12:00 |
02:21:16.03 |
+09:57:55.9 |
HIP 10937 |
6.24 |
| 2026-07-31 00:00 |
02:21:15.97 |
+09:57:54.1 |
HIP 10937 |
6.24 |
| 2026-07-31 12:00 |
02:21:15.90 |
+09:57:52.2 |
HIP 10937 |
6.23 |
| 2026-08-01 00:00 |
02:21:15.81 |
+09:57:50.2 |
HIP 10937 |
6.23 |
| 2026-08-01 12:00 |
02:21:15.71 |
+09:57:48.2 |
HIP 10937 |
6.22 |
| 2026-08-02 00:00 |
02:21:15.60 |
+09:57:46.0 |
HIP 10937 |
6.21 |
| 2026-08-02 12:00 |
02:21:15.47 |
+09:57:43.8 |
HIP 10937 |
6.19 |
| 2026-08-03 00:00 |
02:21:15.33 |
+09:57:41.6 |
HIP 10937 |
6.18 |
| 2026-08-03 12:00 |
02:21:15.17 |
+09:57:39.3 |
HIP 10937 |
6.16 |
| 2026-08-04 00:00 |
02:21:15.00 |
+09:57:36.9 |
HIP 10937 |
6.14 |
| 2026-08-04 12:00 |
02:21:14.82 |
+09:57:34.4 |
HIP 10937 |
6.12 |
| 2026-08-05 00:00 |
02:21:14.62 |
+09:57:31.9 |
HIP 10937 |
6.10 |
| 2026-08-05 12:00 |
02:21:14.41 |
+09:57:29.2 |
HIP 10937 |
6.07 |
| 2026-08-06 00:00 |
02:21:14.18 |
+09:57:26.6 |
HIP 10937 |
6.05 |
| 2026-08-06 12:00 |
02:21:13.94 |
+09:57:23.8 |
HIP 10937 |
6.02 |
| 2026-08-07 00:00 |
02:21:13.69 |
+09:57:21.0 |
HIP 10937 |
5.99 |
| 2026-08-07 12:00 |
02:21:13.42 |
+09:57:18.1 |
HIP 10937 |
5.96 |
| 2026-08-08 00:00 |
02:21:13.14 |
+09:57:15.2 |
HIP 10937 |
5.92 |
| 2026-08-08 12:00 |
02:21:12.85 |
+09:57:12.2 |
HIP 10937 |
5.89 |
| 2026-08-09 00:00 |
02:21:12.54 |
+09:57:09.1 |
HIP 10937 |
5.85 |
| 2026-08-09 12:00 |
02:21:12.22 |
+09:57:05.9 |
HIP 10937 |
5.82 |
| 2026-08-10 00:00 |
02:21:11.88 |
+09:57:02.7 |
HIP 10937 |
5.78 |
| 2026-08-10 12:00 |
02:21:11.53 |
+09:56:59.4 |
HIP 10937 |
5.74 |
| 2026-08-11 00:00 |
02:21:11.17 |
+09:56:56.0 |
HIP 10937 |
5.71 |
| 2026-08-11 12:00 |
02:21:10.79 |
+09:56:52.6 |
HIP 10937 |
5.67 |
| 2026-08-12 00:00 |
02:21:10.40 |
+09:56:49.1 |
HIP 10937 |
5.63 |
| 2026-08-12 12:00 |
02:21:09.99 |
+09:56:45.5 |
HIP 10937 |
5.59 |
| 2026-08-13 00:00 |
02:21:09.57 |
+09:56:41.9 |
HIP 10937 |
5.55 |
| 2026-08-13 12:00 |
02:21:09.14 |
+09:56:38.2 |
HIP 10937 |
5.52 |
| 2026-08-14 00:00 |
02:21:08.69 |
+09:56:34.4 |
HIP 10937 |
5.48 |
| 2026-08-14 12:00 |
02:21:08.23 |
+09:56:30.6 |
HIP 10937 |
5.44 |
| 2026-08-15 00:00 |
02:21:07.76 |
+09:56:26.7 |
HIP 10937 |
5.41 |
| 2026-08-15 12:00 |
02:21:07.27 |
+09:56:22.7 |
HIP 10937 |
5.38 |
| 2026-08-16 00:00 |
02:21:06.77 |
+09:56:18.7 |
HIP 10937 |
5.35 |
| 2026-08-16 12:00 |
02:21:06.25 |
+09:56:14.6 |
HIP 10937 |
5.32 |
| 2026-08-17 00:00 |
02:21:05.72 |
+09:56:10.4 |
HIP 10937 |
5.30 |
| 2026-08-17 12:00 |
02:21:05.18 |
+09:56:06.2 |
HIP 10937 |
5.27 |
| 2026-08-18 00:00 |
02:21:04.62 |
+09:56:01.9 |
HIP 10937 |
5.26 |
| 2026-08-18 12:00 |
02:21:04.05 |
+09:55:57.6 |
HIP 10937 |
5.24 |
| 2026-08-19 00:00 |
02:21:03.47 |
+09:55:53.2 |
HIP 10937 |
5.23 |