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 |
-0.998 |
| 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 |
1998-11-16 |
+14.8291 |
-7.029 |
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) |
| 2026-06-01 00:00 |
19:33:56.08 |
+40:39:48.1 |
HIP 96104 |
33.34 |
| 2026-06-01 12:00 |
19:33:49.89 |
+40:40:39.2 |
HIP 96104 |
32.01 |
| 2026-06-02 00:00 |
19:33:43.66 |
+40:41:29.8 |
HIP 96104 |
30.68 |
| 2026-06-02 12:00 |
19:33:37.38 |
+40:42:19.9 |
HIP 96104 |
29.38 |
| 2026-06-03 00:00 |
19:33:31.06 |
+40:43:09.5 |
HIP 96104 |
28.09 |
| 2026-06-03 12:00 |
19:33:24.68 |
+40:43:58.5 |
HIP 96104 |
26.82 |
| 2026-06-04 00:00 |
19:33:18.27 |
+40:44:47.0 |
HIP 96104 |
25.58 |
| 2026-06-04 12:00 |
19:33:11.81 |
+40:45:34.9 |
HIP 96104 |
24.36 |
| 2026-06-05 00:00 |
19:33:05.30 |
+40:46:22.4 |
HIP 96104 |
23.18 |
| 2026-06-05 12:00 |
19:32:58.75 |
+40:47:09.2 |
HIP 96104 |
22.04 |
| 2026-06-06 00:00 |
19:32:52.16 |
+40:47:55.5 |
HIP 96104 |
20.95 |
| 2026-06-06 12:00 |
19:32:45.52 |
+40:48:41.3 |
HIP 96104 |
19.92 |
| 2026-06-07 00:00 |
19:32:38.84 |
+40:49:26.4 |
HIP 96104 |
18.94 |
| 2026-06-07 12:00 |
19:32:32.12 |
+40:50:11.1 |
HIP 96104 |
18.05 |
| 2026-06-08 00:00 |
19:32:25.36 |
+40:50:55.1 |
HIP 96104 |
17.24 |
| 2026-06-08 12:00 |
19:32:18.55 |
+40:51:38.6 |
HIP 96104 |
16.53 |
| 2026-06-09 00:00 |
19:32:11.71 |
+40:52:21.5 |
HIP 96104 |
15.94 |
| 2026-06-09 12:00 |
19:32:04.82 |
+40:53:03.8 |
HIP 96104 |
15.48 |
| 2026-06-10 00:00 |
19:31:57.90 |
+40:53:45.6 |
HIP 96104 |
15.17 |
| 2026-06-10 12:00 |
19:31:50.93 |
+40:54:26.7 |
HIP 96104 |
15.00 |
| 2026-06-11 00:00 |
19:31:43.92 |
+40:55:07.3 |
HIP 96104 |
14.99 |
| 2026-06-11 12:00 |
19:31:36.88 |
+40:55:47.2 |
HIP 96104 |
15.14 |
| 2026-06-12 00:00 |
19:31:29.80 |
+40:56:26.6 |
HIP 96104 |
15.45 |
| 2026-06-12 12:00 |
19:31:22.68 |
+40:57:05.4 |
HIP 96104 |
15.90 |
| 2026-06-13 00:00 |
19:31:15.52 |
+40:57:43.5 |
HIP 96104 |
16.49 |
| 2026-06-13 12:00 |
19:31:08.33 |
+40:58:21.1 |
HIP 96104 |
17.19 |
| 2026-06-14 00:00 |
19:31:01.09 |
+40:58:58.0 |
HIP 96104 |
18.01 |
| 2026-06-14 12:00 |
19:30:53.83 |
+40:59:34.3 |
HIP 96104 |
18.91 |
| 2026-06-15 00:00 |
19:30:46.53 |
+41:00:10.0 |
HIP 96104 |
19.90 |
| 2026-06-15 12:00 |
19:30:39.19 |
+41:00:45.1 |
HIP 96104 |
20.96 |
| 2026-06-16 00:00 |
19:30:31.82 |
+41:01:19.5 |
HIP 96104 |
22.08 |
| 2026-06-16 12:00 |
19:30:24.42 |
+41:01:53.3 |
HIP 95761 |
22.34 |
| 2026-06-17 00:00 |
19:30:16.99 |
+41:02:26.5 |
HIP 95761 |
20.84 |
| 2026-06-17 12:00 |
19:30:09.52 |
+41:02:59.0 |
HIP 95761 |
19.34 |
| 2026-06-18 00:00 |
19:30:02.02 |
+41:03:30.9 |
HIP 95761 |
17.84 |
| 2026-06-18 12:00 |
19:29:54.49 |
+41:04:02.2 |
HIP 95761 |
16.35 |
| 2026-06-19 00:00 |
19:29:46.93 |
+41:04:32.8 |
HIP 95761 |
14.85 |
| 2026-06-19 12:00 |
19:29:39.35 |
+41:05:02.8 |
HIP 95761 |
13.37 |
| 2026-06-20 00:00 |
19:29:31.73 |
+41:05:32.1 |
HIP 95761 |
11.89 |
| 2026-06-20 12:00 |
19:29:24.08 |
+41:06:00.8 |
HIP 95761 |
10.42 |
| 2026-06-21 00:00 |
19:29:16.41 |
+41:06:28.8 |
HIP 95761 |
8.98 |
| 2026-06-21 12:00 |
19:29:08.71 |
+41:06:56.2 |
HIP 95761 |
7.56 |
| 2026-06-22 00:00 |
19:29:00.98 |
+41:07:22.9 |
HIP 95761 |
6.20 |