C/2001 G1 (LONEOS)
メタデータ
| 項目 |
値 |
| Designation |
C/2001 G1 (LONEOS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-10-09T05:10:18.793920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
134 |
| NEO |
- |
| M1 |
9.800 |
| 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) |
2002-01-12.0000000 |
| e |
1.00280088 |
| q (au) |
8.235531 |
| a (au) |
-2940.336115 |
| i (deg) |
45.364449 |
| Ω (om, deg) |
203.891133 |
| ω (w, deg) |
343.281547 |
| M (ma, deg) |
0.000586 |
等級
散乱 + 全体線形
$$
M_a = (8.467 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.467 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.506 |
| 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 |
| 2002-04-04 |
2004-05-28 |
-40.2814 |
+37.563 |
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 |
20:39:17.22 |
+24:27:15.9 |
HIP 101912 |
3.39 |
| 2026-02-03 12:00 |
20:39:20.60 |
+24:27:27.3 |
HIP 101912 |
4.11 |
| 2026-02-04 00:00 |
20:39:23.97 |
+24:27:39.0 |
HIP 101912 |
4.85 |
| 2026-02-04 12:00 |
20:39:27.34 |
+24:27:51.0 |
HIP 101912 |
5.61 |
| 2026-02-05 00:00 |
20:39:30.71 |
+24:28:03.1 |
HIP 101912 |
6.37 |
| 2026-02-05 12:00 |
20:39:34.07 |
+24:28:15.6 |
HIP 101912 |
7.15 |
| 2026-02-06 00:00 |
20:39:37.43 |
+24:28:28.2 |
HIP 101912 |
7.93 |
| 2026-02-06 12:00 |
20:39:40.78 |
+24:28:41.1 |
HIP 101912 |
8.71 |
| 2026-02-07 00:00 |
20:39:44.13 |
+24:28:54.3 |
HIP 101912 |
9.49 |
| 2026-02-07 12:00 |
20:39:47.48 |
+24:29:07.6 |
HIP 101912 |
10.28 |
| 2026-02-08 00:00 |
20:39:50.82 |
+24:29:21.2 |
HIP 101912 |
11.06 |
| 2026-02-08 12:00 |
20:39:54.15 |
+24:29:35.1 |
HIP 101912 |
11.85 |
| 2026-02-09 00:00 |
20:39:57.48 |
+24:29:49.1 |
HIP 101912 |
12.64 |
| 2026-02-09 12:00 |
20:40:00.80 |
+24:30:03.4 |
HIP 101912 |
13.43 |
| 2026-02-10 00:00 |
20:40:04.12 |
+24:30:17.9 |
HIP 101912 |
14.22 |
| 2026-02-10 12:00 |
20:40:07.43 |
+24:30:32.7 |
HIP 101912 |
15.01 |
| 2026-02-11 00:00 |
20:40:10.73 |
+24:30:47.7 |
HIP 101912 |
15.80 |
| 2026-02-11 12:00 |
20:40:14.03 |
+24:31:02.9 |
HIP 101912 |
16.59 |
| 2026-02-12 00:00 |
20:40:17.32 |
+24:31:18.4 |
HIP 101912 |
17.39 |
| 2026-02-12 12:00 |
20:40:20.61 |
+24:31:34.0 |
HIP 101912 |
18.18 |
| 2026-02-13 00:00 |
20:40:23.89 |
+24:31:49.9 |
HIP 101912 |
18.97 |
| 2026-02-13 12:00 |
20:40:27.15 |
+24:32:06.0 |
HIP 101912 |
19.76 |
| 2026-02-14 00:00 |
20:40:30.42 |
+24:32:22.4 |
HIP 101912 |
20.55 |
| 2026-02-14 12:00 |
20:40:33.67 |
+24:32:38.9 |
HIP 101912 |
21.34 |
| 2026-02-15 00:00 |
20:40:36.92 |
+24:32:55.7 |
HIP 101912 |
22.13 |
| 2026-02-15 12:00 |
20:40:40.15 |
+24:33:12.7 |
HIP 101912 |
22.92 |
| 2026-02-16 00:00 |
20:40:43.38 |
+24:33:29.9 |
HIP 101912 |
23.70 |
| 2026-02-16 12:00 |
20:40:46.60 |
+24:33:47.3 |
HIP 101912 |
24.49 |
| 2026-02-17 00:00 |
20:40:49.82 |
+24:34:05.0 |
HIP 101912 |
25.28 |
| 2026-02-17 12:00 |
20:40:53.02 |
+24:34:22.8 |
HIP 102120 |
25.93 |
| 2026-02-18 00:00 |
20:40:56.21 |
+24:34:40.9 |
HIP 102120 |
25.90 |
| 2026-02-18 12:00 |
20:40:59.39 |
+24:34:59.2 |
HIP 102120 |
25.90 |
| 2026-02-19 00:00 |
20:41:02.57 |
+24:35:17.7 |
HIP 102120 |
25.93 |
| 2026-02-19 12:00 |
20:41:05.73 |
+24:35:36.4 |
HIP 102120 |
25.99 |
| 2026-02-20 00:00 |
20:41:08.89 |
+24:35:55.3 |
HIP 102120 |
26.07 |
| 2026-02-20 12:00 |
20:41:12.03 |
+24:36:14.4 |
HIP 102120 |
26.18 |
| 2026-02-21 00:00 |
20:41:15.16 |
+24:36:33.7 |
HIP 102120 |
26.32 |
| 2026-02-21 12:00 |
20:41:18.28 |
+24:36:53.2 |
HIP 102120 |
26.48 |
| 2026-02-22 00:00 |
20:41:21.39 |
+24:37:12.9 |
HIP 102120 |
26.67 |
| 2026-02-22 12:00 |
20:41:24.49 |
+24:37:32.8 |
HIP 102120 |
26.89 |
| 2026-02-23 00:00 |
20:41:27.58 |
+24:37:52.9 |
HIP 102120 |
27.13 |
| 2026-02-23 12:00 |
20:41:30.65 |
+24:38:13.2 |
HIP 102120 |
27.39 |
| 2026-02-24 00:00 |
20:41:33.72 |
+24:38:33.7 |
HIP 102120 |
27.67 |