C/1998 G1 (LINEAR)
メタデータ
| 項目 |
値 |
| Designation |
C/1998 G1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-11-16T14:59:02.595840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
161 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-04-21.0000000 |
| e |
0.82369261 |
| q (au) |
2.133379 |
| a (au) |
12.100336 |
| i (deg) |
109.714727 |
| Ω (om, deg) |
341.383665 |
| ω (w, deg) |
236.322318 |
| M (ma, deg) |
355.091490 |
等級
散乱 + 全体線形
$$
M_a = (7.797 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.797 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1998-04-02 |
1998-06-17 |
-11.4788 |
+5.725 |
| 1998-06-17 |
1998-11-16 |
+35.9245 |
-14.426 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
19:32:03.54 |
+36:17:26.7 |
HIP 95996 |
13.68 |
| 2026-02-03 12:00 |
19:32:09.41 |
+36:18:04.6 |
HIP 95996 |
15.00 |
| 2026-02-04 00:00 |
19:32:15.26 |
+36:18:43.0 |
HIP 95996 |
16.34 |
| 2026-02-04 12:00 |
19:32:21.09 |
+36:19:22.0 |
HIP 95996 |
17.67 |
| 2026-02-05 00:00 |
19:32:26.90 |
+36:20:01.5 |
HIP 95996 |
19.01 |
| 2026-02-05 12:00 |
19:32:32.69 |
+36:20:41.5 |
HIP 95996 |
20.34 |
| 2026-02-06 00:00 |
19:32:38.45 |
+36:21:22.0 |
HIP 95996 |
21.68 |
| 2026-02-06 12:00 |
19:32:44.19 |
+36:22:03.1 |
HIP 96194 |
21.94 |
| 2026-02-07 00:00 |
19:32:49.90 |
+36:22:44.7 |
HIP 96194 |
22.04 |
| 2026-02-07 12:00 |
19:32:55.60 |
+36:23:26.9 |
HIP 96194 |
22.23 |
| 2026-02-08 00:00 |
19:33:01.26 |
+36:24:09.5 |
HIP 96194 |
22.51 |
| 2026-02-08 12:00 |
19:33:06.91 |
+36:24:52.7 |
HIP 96194 |
22.88 |
| 2026-02-09 00:00 |
19:33:12.52 |
+36:25:36.4 |
HIP 96194 |
23.33 |
| 2026-02-09 12:00 |
19:33:18.11 |
+36:26:20.6 |
HIP 96194 |
23.85 |
| 2026-02-10 00:00 |
19:33:23.68 |
+36:27:05.4 |
HIP 96194 |
24.45 |
| 2026-02-10 12:00 |
19:33:29.22 |
+36:27:50.6 |
HIP 96194 |
25.11 |
| 2026-02-11 00:00 |
19:33:34.73 |
+36:28:36.4 |
HIP 96194 |
25.84 |
| 2026-02-11 12:00 |
19:33:40.21 |
+36:29:22.6 |
HIP 96194 |
26.62 |
| 2026-02-12 00:00 |
19:33:45.67 |
+36:30:09.4 |
HIP 96194 |
27.46 |
| 2026-02-12 12:00 |
19:33:51.09 |
+36:30:56.7 |
HIP 96194 |
28.34 |
| 2026-02-13 00:00 |
19:33:56.49 |
+36:31:44.5 |
HIP 96194 |
29.27 |
| 2026-02-13 12:00 |
19:34:01.86 |
+36:32:32.7 |
HIP 96194 |
30.23 |
| 2026-02-14 00:00 |
19:34:07.20 |
+36:33:21.5 |
HIP 96446 |
29.14 |
| 2026-02-14 12:00 |
19:34:12.51 |
+36:34:10.7 |
HIP 96446 |
27.97 |
| 2026-02-15 00:00 |
19:34:17.79 |
+36:35:00.5 |
HIP 96446 |
26.81 |
| 2026-02-15 12:00 |
19:34:23.04 |
+36:35:50.7 |
HIP 96446 |
25.68 |
| 2026-02-16 00:00 |
19:34:28.25 |
+36:36:41.4 |
HIP 96446 |
24.58 |
| 2026-02-16 12:00 |
19:34:33.44 |
+36:37:32.6 |
HIP 96446 |
23.51 |
| 2026-02-17 00:00 |
19:34:38.59 |
+36:38:24.2 |
HIP 96446 |
22.47 |
| 2026-02-17 12:00 |
19:34:43.71 |
+36:39:16.4 |
HIP 96446 |
21.48 |
| 2026-02-18 00:00 |
19:34:48.80 |
+36:40:09.0 |
HIP 96387 |
20.37 |
| 2026-02-18 12:00 |
19:34:53.85 |
+36:41:02.0 |
HIP 96387 |
19.06 |
| 2026-02-19 00:00 |
19:34:58.87 |
+36:41:55.5 |
HIP 96387 |
17.76 |
| 2026-02-19 12:00 |
19:35:03.85 |
+36:42:49.5 |
HIP 96387 |
16.46 |
| 2026-02-20 00:00 |
19:35:08.80 |
+36:43:44.0 |
HIP 96387 |
15.16 |
| 2026-02-20 12:00 |
19:35:13.71 |
+36:44:38.9 |
HIP 96387 |
13.87 |
| 2026-02-21 00:00 |
19:35:18.59 |
+36:45:34.2 |
HIP 96387 |
12.59 |
| 2026-02-21 12:00 |
19:35:23.43 |
+36:46:30.0 |
HIP 96387 |
11.32 |
| 2026-02-22 00:00 |
19:35:28.24 |
+36:47:26.2 |
HIP 96387 |
10.07 |
| 2026-02-22 12:00 |
19:35:33.00 |
+36:48:22.9 |
HIP 96387 |
8.84 |
| 2026-02-23 00:00 |
19:35:37.73 |
+36:49:19.9 |
HIP 96387 |
7.64 |
| 2026-02-23 12:00 |
19:35:42.43 |
+36:50:17.5 |
HIP 96387 |
6.49 |
| 2026-02-24 00:00 |
19:35:47.08 |
+36:51:15.4 |
HIP 96387 |
5.42 |