メタデータ
| 項目 |
値 |
| Designation |
C/1973 W1 (Gibson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1973-08-09T22:26:06.357120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:22Z |
| Obs used |
21 |
| 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) |
1974-03-23.0000000 |
| e |
1.00046050 |
| q (au) |
3.842303 |
| a (au) |
-8343.718944 |
| i (deg) |
108.064665 |
| Ω (om, deg) |
244.597443 |
| ω (w, deg) |
221.267469 |
| M (ma, deg) |
0.000291 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
16:03:24.17 |
-05:51:02.4 |
HIP 78624 |
5.23 |
| 2026-05-12 12:00 |
16:03:22.65 |
-05:50:56.0 |
HIP 78624 |
4.84 |
| 2026-05-13 00:00 |
16:03:21.13 |
-05:50:49.5 |
HIP 78624 |
4.45 |
| 2026-05-13 12:00 |
16:03:19.60 |
-05:50:43.1 |
HIP 78624 |
4.06 |
| 2026-05-14 00:00 |
16:03:18.07 |
-05:50:36.8 |
HIP 78624 |
3.66 |
| 2026-05-14 12:00 |
16:03:16.54 |
-05:50:30.5 |
HIP 78624 |
3.27 |
| 2026-05-15 00:00 |
16:03:15.01 |
-05:50:24.2 |
HIP 78624 |
2.88 |
| 2026-05-15 12:00 |
16:03:13.47 |
-05:50:18.0 |
HIP 78624 |
2.49 |
| 2026-05-16 00:00 |
16:03:11.94 |
-05:50:11.9 |
HIP 78624 |
2.10 |
| 2026-05-16 12:00 |
16:03:10.40 |
-05:50:05.7 |
HIP 78624 |
1.71 |
| 2026-05-17 00:00 |
16:03:08.86 |
-05:49:59.7 |
HIP 78624 |
1.33 |
| 2026-05-17 12:00 |
16:03:07.32 |
-05:49:53.6 |
HIP 78624 |
0.96 |
| 2026-05-18 00:00 |
16:03:05.77 |
-05:49:47.6 |
HIP 78624 |
0.63 |
| 2026-05-18 12:00 |
16:03:04.23 |
-05:49:41.7 |
HIP 78624 |
0.41 |
| 2026-05-19 00:00 |
16:03:02.68 |
-05:49:35.8 |
HIP 78624 |
0.51 |
| 2026-05-19 12:00 |
16:03:01.13 |
-05:49:30.0 |
HIP 78624 |
0.82 |
| 2026-05-20 00:00 |
16:02:59.58 |
-05:49:24.2 |
HIP 78624 |
1.18 |
| 2026-05-20 12:00 |
16:02:58.04 |
-05:49:18.5 |
HIP 78624 |
1.56 |
| 2026-05-21 00:00 |
16:02:56.49 |
-05:49:12.8 |
HIP 78624 |
1.95 |
| 2026-05-21 12:00 |
16:02:54.94 |
-05:49:07.1 |
HIP 78624 |
2.33 |
| 2026-05-22 00:00 |
16:02:53.38 |
-05:49:01.5 |
HIP 78624 |
2.73 |
| 2026-05-22 12:00 |
16:02:51.83 |
-05:48:56.0 |
HIP 78624 |
3.12 |
| 2026-05-23 00:00 |
16:02:50.28 |
-05:48:50.5 |
HIP 78624 |
3.51 |
| 2026-05-23 12:00 |
16:02:48.73 |
-05:48:45.1 |
HIP 78624 |
3.90 |
| 2026-05-24 00:00 |
16:02:47.18 |
-05:48:39.7 |
HIP 78624 |
4.30 |
| 2026-05-24 12:00 |
16:02:45.63 |
-05:48:34.3 |
HIP 78624 |
4.69 |
| 2026-05-25 00:00 |
16:02:44.07 |
-05:48:29.1 |
HIP 78624 |
5.09 |
| 2026-05-25 12:00 |
16:02:42.52 |
-05:48:23.8 |
HIP 78624 |
5.48 |
| 2026-05-26 00:00 |
16:02:40.97 |
-05:48:18.6 |
HIP 78624 |
5.87 |
| 2026-05-26 12:00 |
16:02:39.42 |
-05:48:13.5 |
HIP 78624 |
6.27 |
| 2026-05-27 00:00 |
16:02:37.87 |
-05:48:08.4 |
HIP 78624 |
6.66 |
| 2026-05-27 12:00 |
16:02:36.32 |
-05:48:03.4 |
HIP 78624 |
7.05 |
| 2026-05-28 00:00 |
16:02:34.78 |
-05:47:58.4 |
HIP 78624 |
7.45 |
| 2026-05-28 12:00 |
16:02:33.23 |
-05:47:53.5 |
HIP 78624 |
7.84 |
| 2026-05-29 00:00 |
16:02:31.68 |
-05:47:48.7 |
HIP 78624 |
8.23 |
| 2026-05-29 12:00 |
16:02:30.14 |
-05:47:43.8 |
HIP 78624 |
8.62 |
| 2026-05-30 00:00 |
16:02:28.60 |
-05:47:39.1 |
HIP 78624 |
9.01 |
| 2026-05-30 12:00 |
16:02:27.05 |
-05:47:34.4 |
HIP 78624 |
9.40 |
| 2026-05-31 00:00 |
16:02:25.51 |
-05:47:29.7 |
HIP 78624 |
9.79 |
| 2026-05-31 12:00 |
16:02:23.97 |
-05:47:25.1 |
HIP 78624 |
10.18 |
| 2026-06-01 00:00 |
16:02:22.44 |
-05:47:20.6 |
HIP 78624 |
10.57 |
| 2026-06-01 12:00 |
16:02:20.90 |
-05:47:16.1 |
HIP 78624 |
10.96 |
| 2026-06-02 00:00 |
16:02:19.37 |
-05:47:11.7 |
HIP 78509 |
11.28 |