メタデータ
| 項目 |
値 |
| Designation |
C/2007 G1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-11-16T10:11:22.225920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:06Z |
| Obs used |
2001 |
| NEO |
- |
| M1 |
10.800 |
| 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) |
2008-01-11.0000000 |
| e |
1.00150564 |
| q (au) |
2.646214 |
| a (au) |
-1757.531288 |
| i (deg) |
88.358397 |
| Ω (om, deg) |
78.992256 |
| ω (w, deg) |
224.020457 |
| M (ma, deg) |
-0.004152 |
等級
散乱 + 全体線形
$$
M_a = (12.690 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.690 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.732 |
| k |
0.800 |
| 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 |
| 2007-04-10 |
2007-09-17 |
+9.3628 |
-7.135 |
| 2007-09-17 |
2008-07-04 |
-5.1279 |
+3.059 |
| 2008-07-04 |
2008-10-24 |
+29.8517 |
-13.922 |
| 2009-01-03 |
2011-02-06 |
+1.0903 |
-0.233 |
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) |
| 2026-09-20 00:00 |
05:16:42.55 |
+35:33:42.8 |
HIP 24464 |
24.40 |
| 2026-09-20 12:00 |
05:16:41.96 |
+35:33:56.0 |
HIP 24464 |
24.41 |
| 2026-09-21 00:00 |
05:16:41.34 |
+35:34:09.2 |
HIP 24464 |
24.41 |
| 2026-09-21 12:00 |
05:16:40.69 |
+35:34:22.4 |
HIP 24464 |
24.41 |
| 2026-09-22 00:00 |
05:16:40.00 |
+35:34:35.5 |
HIP 24464 |
24.41 |
| 2026-09-22 12:00 |
05:16:39.28 |
+35:34:48.5 |
HIP 24464 |
24.41 |
| 2026-09-23 00:00 |
05:16:38.53 |
+35:35:01.6 |
HIP 24464 |
24.40 |
| 2026-09-23 12:00 |
05:16:37.73 |
+35:35:14.6 |
HIP 24464 |
24.39 |
| 2026-09-24 00:00 |
05:16:36.91 |
+35:35:27.5 |
HIP 24464 |
24.37 |
| 2026-09-24 12:00 |
05:16:36.05 |
+35:35:40.4 |
HIP 24464 |
24.35 |
| 2026-09-25 00:00 |
05:16:35.16 |
+35:35:53.3 |
HIP 24464 |
24.33 |
| 2026-09-25 12:00 |
05:16:34.23 |
+35:36:06.1 |
HIP 24464 |
24.31 |
| 2026-09-26 00:00 |
05:16:33.27 |
+35:36:18.9 |
HIP 24464 |
24.28 |
| 2026-09-26 12:00 |
05:16:32.27 |
+35:36:31.6 |
HIP 24464 |
24.25 |
| 2026-09-27 00:00 |
05:16:31.24 |
+35:36:44.3 |
HIP 24464 |
24.22 |
| 2026-09-27 12:00 |
05:16:30.18 |
+35:36:56.9 |
HIP 24464 |
24.19 |
| 2026-09-28 00:00 |
05:16:29.08 |
+35:37:09.5 |
HIP 24464 |
24.15 |
| 2026-09-28 12:00 |
05:16:27.95 |
+35:37:22.0 |
HIP 24464 |
24.11 |
| 2026-09-29 00:00 |
05:16:26.79 |
+35:37:34.5 |
HIP 24464 |
24.07 |
| 2026-09-29 12:00 |
05:16:25.59 |
+35:37:46.9 |
HIP 24464 |
24.03 |
| 2026-09-30 00:00 |
05:16:24.35 |
+35:37:59.3 |
HIP 24464 |
23.99 |
| 2026-09-30 12:00 |
05:16:23.09 |
+35:38:11.7 |
HIP 24464 |
23.95 |
| 2026-10-01 00:00 |
05:16:21.78 |
+35:38:23.9 |
HIP 24464 |
23.90 |
| 2026-10-01 12:00 |
05:16:20.45 |
+35:38:36.2 |
HIP 24464 |
23.86 |
| 2026-10-02 00:00 |
05:16:19.08 |
+35:38:48.3 |
HIP 24464 |
23.81 |
| 2026-10-02 12:00 |
05:16:17.68 |
+35:39:00.4 |
HIP 24464 |
23.77 |
| 2026-10-03 00:00 |
05:16:16.24 |
+35:39:12.5 |
HIP 24464 |
23.72 |
| 2026-10-03 12:00 |
05:16:14.77 |
+35:39:24.5 |
HIP 24464 |
23.67 |
| 2026-10-04 00:00 |
05:16:13.27 |
+35:39:36.4 |
HIP 24464 |
23.63 |
| 2026-10-04 12:00 |
05:16:11.73 |
+35:39:48.3 |
HIP 24464 |
23.58 |
| 2026-10-05 00:00 |
05:16:10.16 |
+35:40:00.1 |
HIP 24464 |
23.54 |
| 2026-10-05 12:00 |
05:16:08.56 |
+35:40:11.9 |
HIP 24464 |
23.49 |
| 2026-10-06 00:00 |
05:16:06.92 |
+35:40:23.6 |
HIP 24464 |
23.45 |
| 2026-10-06 12:00 |
05:16:05.25 |
+35:40:35.2 |
HIP 24464 |
23.41 |
| 2026-10-07 00:00 |
05:16:03.55 |
+35:40:46.8 |
HIP 24464 |
23.37 |
| 2026-10-07 12:00 |
05:16:01.81 |
+35:40:58.3 |
HIP 24464 |
23.34 |
| 2026-10-08 00:00 |
05:16:00.04 |
+35:41:09.7 |
HIP 24464 |
23.30 |
| 2026-10-08 12:00 |
05:15:58.24 |
+35:41:21.1 |
HIP 24464 |
23.27 |
| 2026-10-09 00:00 |
05:15:56.41 |
+35:41:32.4 |
HIP 24464 |
23.24 |
| 2026-10-09 12:00 |
05:15:54.54 |
+35:41:43.6 |
HIP 24464 |
23.21 |
| 2026-10-10 00:00 |
05:15:52.64 |
+35:41:54.8 |
HIP 24464 |
23.19 |
| 2026-10-10 12:00 |
05:15:50.71 |
+35:42:05.9 |
HIP 24464 |
23.18 |
| 2026-10-11 00:00 |
05:15:48.74 |
+35:42:16.9 |
HIP 24464 |
23.16 |