C/1999 G1 (LINEAR)
メタデータ
| 項目 |
値 |
| Designation |
C/1999 G1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-08-01T15:27:45.645120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
76 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1999-04-12.0000000 |
| e |
0.85677293 |
| q (au) |
4.048556 |
| a (au) |
28.266698 |
| i (deg) |
76.568197 |
| Ω (om, deg) |
23.462057 |
| ω (w, deg) |
136.125424 |
| M (ma, deg) |
1.661583 |
等級
散乱 + 全体線形
$$
M_a = (12.053 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.053 |
| n |
2.000 |
| gf |
0.965 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.943 |
| 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) |
| 2026-02-03 00:00 |
02:09:22.27 |
-55:12:13.4 |
HIP 9961 |
21.63 |
| 2026-02-03 12:00 |
02:09:23.02 |
-55:11:25.1 |
HIP 9961 |
22.40 |
| 2026-02-04 00:00 |
02:09:23.82 |
-55:10:36.8 |
HIP 9961 |
23.18 |
| 2026-02-04 12:00 |
02:09:24.65 |
-55:09:48.6 |
HIP 9961 |
23.96 |
| 2026-02-05 00:00 |
02:09:25.54 |
-55:09:00.3 |
HIP 9961 |
24.74 |
| 2026-02-05 12:00 |
02:09:26.46 |
-55:08:12.1 |
HIP 9961 |
25.53 |
| 2026-02-06 00:00 |
02:09:27.44 |
-55:07:24.0 |
HIP 9825 |
25.72 |
| 2026-02-06 12:00 |
02:09:28.45 |
-55:06:35.9 |
HIP 9825 |
25.81 |
| 2026-02-07 00:00 |
02:09:29.51 |
-55:05:47.8 |
HIP 9825 |
25.92 |
| 2026-02-07 12:00 |
02:09:30.61 |
-55:04:59.8 |
HIP 10134 |
26.07 |
| 2026-02-08 00:00 |
02:09:31.76 |
-55:04:11.8 |
HIP 10134 |
25.25 |
| 2026-02-08 12:00 |
02:09:32.94 |
-55:03:23.8 |
HIP 10134 |
24.44 |
| 2026-02-09 00:00 |
02:09:34.18 |
-55:02:36.0 |
HIP 10134 |
23.62 |
| 2026-02-09 12:00 |
02:09:35.45 |
-55:01:48.1 |
HIP 10134 |
22.81 |
| 2026-02-10 00:00 |
02:09:36.77 |
-55:01:00.4 |
HIP 10134 |
21.99 |
| 2026-02-10 12:00 |
02:09:38.13 |
-55:00:12.7 |
HIP 10134 |
21.17 |
| 2026-02-11 00:00 |
02:09:39.54 |
-54:59:25.1 |
HIP 10134 |
20.36 |
| 2026-02-11 12:00 |
02:09:40.98 |
-54:58:37.5 |
HIP 10134 |
19.54 |
| 2026-02-12 00:00 |
02:09:42.47 |
-54:57:50.0 |
HIP 10134 |
18.72 |
| 2026-02-12 12:00 |
02:09:44.00 |
-54:57:02.6 |
HIP 10134 |
17.90 |
| 2026-02-13 00:00 |
02:09:45.57 |
-54:56:15.3 |
HIP 10134 |
17.08 |
| 2026-02-13 12:00 |
02:09:47.19 |
-54:55:28.0 |
HIP 10134 |
16.26 |
| 2026-02-14 00:00 |
02:09:48.84 |
-54:54:40.8 |
HIP 10134 |
15.43 |
| 2026-02-14 12:00 |
02:09:50.54 |
-54:53:53.8 |
HIP 10134 |
14.61 |
| 2026-02-15 00:00 |
02:09:52.28 |
-54:53:06.8 |
HIP 10134 |
13.79 |
| 2026-02-15 12:00 |
02:09:54.06 |
-54:52:19.9 |
HIP 10134 |
12.97 |
| 2026-02-16 00:00 |
02:09:55.88 |
-54:51:33.1 |
HIP 10134 |
12.15 |
| 2026-02-16 12:00 |
02:09:57.74 |
-54:50:46.4 |
HIP 10134 |
11.32 |
| 2026-02-17 00:00 |
02:09:59.65 |
-54:49:59.9 |
HIP 10134 |
10.50 |
| 2026-02-17 12:00 |
02:10:01.59 |
-54:49:13.4 |
HIP 10134 |
9.68 |
| 2026-02-18 00:00 |
02:10:03.57 |
-54:48:27.0 |
HIP 10134 |
8.86 |
| 2026-02-18 12:00 |
02:10:05.59 |
-54:47:40.8 |
HIP 10134 |
8.04 |
| 2026-02-19 00:00 |
02:10:07.66 |
-54:46:54.7 |
HIP 10134 |
7.22 |
| 2026-02-19 12:00 |
02:10:09.76 |
-54:46:08.7 |
HIP 10134 |
6.40 |
| 2026-02-20 00:00 |
02:10:11.90 |
-54:45:22.8 |
HIP 10134 |
5.59 |
| 2026-02-20 12:00 |
02:10:14.08 |
-54:44:37.1 |
HIP 10134 |
4.78 |
| 2026-02-21 00:00 |
02:10:16.30 |
-54:43:51.5 |
HIP 10134 |
3.98 |
| 2026-02-21 12:00 |
02:10:18.56 |
-54:43:06.0 |
HIP 10134 |
3.19 |
| 2026-02-22 00:00 |
02:10:20.85 |
-54:42:20.6 |
HIP 10134 |
2.43 |
| 2026-02-22 12:00 |
02:10:23.18 |
-54:41:35.4 |
HIP 10134 |
1.74 |
| 2026-02-23 00:00 |
02:10:25.56 |
-54:40:50.4 |
HIP 10134 |
1.22 |
| 2026-02-23 12:00 |
02:10:27.96 |
-54:40:05.5 |
HIP 10134 |
1.16 |
| 2026-02-24 00:00 |
02:10:30.41 |
-54:39:20.7 |
HIP 10134 |
1.61 |