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 |
0.988 |
| 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 |
+9.3624 |
-7.134 |
| 2007-09-17 |
2008-07-04 |
-5.1278 |
+3.059 |
| 2008-07-04 |
2008-10-24 |
+29.8486 |
-13.920 |
| 2009-01-03 |
2011-02-06 |
+1.0900 |
-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) |
| 2026-03-26 00:00 |
05:01:31.54 |
+34:49:38.0 |
HIP 23337 |
19.66 |
| 2026-03-26 12:00 |
05:01:32.78 |
+34:49:32.9 |
HIP 23337 |
19.63 |
| 2026-03-27 00:00 |
05:01:34.05 |
+34:49:27.8 |
HIP 23337 |
19.61 |
| 2026-03-27 12:00 |
05:01:35.35 |
+34:49:22.8 |
HIP 23337 |
19.60 |
| 2026-03-28 00:00 |
05:01:36.69 |
+34:49:17.8 |
HIP 23337 |
19.59 |
| 2026-03-28 12:00 |
05:01:38.06 |
+34:49:12.9 |
HIP 23337 |
19.59 |
| 2026-03-29 00:00 |
05:01:39.45 |
+34:49:08.1 |
HIP 23337 |
19.60 |
| 2026-03-29 12:00 |
05:01:40.89 |
+34:49:03.4 |
HIP 23337 |
19.61 |
| 2026-03-30 00:00 |
05:01:42.35 |
+34:48:58.7 |
HIP 23337 |
19.64 |
| 2026-03-30 12:00 |
05:01:43.84 |
+34:48:54.2 |
HIP 23337 |
19.67 |
| 2026-03-31 00:00 |
05:01:45.36 |
+34:48:49.6 |
HIP 23337 |
19.71 |
| 2026-03-31 12:00 |
05:01:46.92 |
+34:48:45.2 |
HIP 23337 |
19.76 |
| 2026-04-01 00:00 |
05:01:48.50 |
+34:48:40.9 |
HIP 23337 |
19.81 |
| 2026-04-01 12:00 |
05:01:50.12 |
+34:48:36.6 |
HIP 23337 |
19.88 |
| 2026-04-02 00:00 |
05:01:51.76 |
+34:48:32.4 |
HIP 23337 |
19.96 |
| 2026-04-02 12:00 |
05:01:53.44 |
+34:48:28.2 |
HIP 23337 |
20.04 |
| 2026-04-03 00:00 |
05:01:55.15 |
+34:48:24.2 |
HIP 23337 |
20.14 |
| 2026-04-03 12:00 |
05:01:56.88 |
+34:48:20.2 |
HIP 23337 |
20.25 |
| 2026-04-04 00:00 |
05:01:58.65 |
+34:48:16.3 |
HIP 23337 |
20.36 |
| 2026-04-04 12:00 |
05:02:00.44 |
+34:48:12.5 |
HIP 23337 |
20.49 |
| 2026-04-05 00:00 |
05:02:02.27 |
+34:48:08.8 |
HIP 23337 |
20.62 |
| 2026-04-05 12:00 |
05:02:04.12 |
+34:48:05.1 |
HIP 23337 |
20.77 |
| 2026-04-06 00:00 |
05:02:06.01 |
+34:48:01.5 |
HIP 23337 |
20.93 |
| 2026-04-06 12:00 |
05:02:07.92 |
+34:47:58.0 |
HIP 23337 |
21.09 |
| 2026-04-07 00:00 |
05:02:09.86 |
+34:47:54.6 |
HIP 23337 |
21.27 |
| 2026-04-07 12:00 |
05:02:11.83 |
+34:47:51.3 |
HIP 23337 |
21.46 |
| 2026-04-08 00:00 |
05:02:13.83 |
+34:47:48.0 |
HIP 23337 |
21.66 |
| 2026-04-08 12:00 |
05:02:15.86 |
+34:47:44.8 |
HIP 23337 |
21.87 |
| 2026-04-09 00:00 |
05:02:17.91 |
+34:47:41.7 |
HIP 23337 |
22.09 |
| 2026-04-09 12:00 |
05:02:19.99 |
+34:47:38.7 |
HIP 23337 |
22.32 |
| 2026-04-10 00:00 |
05:02:22.10 |
+34:47:35.7 |
HIP 23337 |
22.56 |
| 2026-04-10 12:00 |
05:02:24.24 |
+34:47:32.9 |
HIP 23337 |
22.81 |
| 2026-04-11 00:00 |
05:02:26.41 |
+34:47:30.1 |
HIP 23337 |
23.08 |
| 2026-04-11 12:00 |
05:02:28.60 |
+34:47:27.4 |
HIP 23337 |
23.35 |
| 2026-04-12 00:00 |
05:02:30.82 |
+34:47:24.8 |
HIP 23337 |
23.64 |
| 2026-04-12 12:00 |
05:02:33.07 |
+34:47:22.3 |
HIP 23337 |
23.93 |
| 2026-04-13 00:00 |
05:02:35.35 |
+34:47:19.8 |
HIP 23337 |
24.23 |
| 2026-04-13 12:00 |
05:02:37.65 |
+34:47:17.5 |
HIP 23337 |
24.55 |
| 2026-04-14 00:00 |
05:02:39.98 |
+34:47:15.2 |
HIP 23337 |
24.87 |
| 2026-04-14 12:00 |
05:02:42.33 |
+34:47:13.0 |
HIP 23337 |
25.21 |
| 2026-04-15 00:00 |
05:02:44.71 |
+34:47:10.9 |
HIP 23337 |
25.55 |
| 2026-04-15 12:00 |
05:02:47.12 |
+34:47:08.9 |
HIP 23337 |
25.91 |
| 2026-04-16 00:00 |
05:02:49.55 |
+34:47:06.9 |
HIP 23337 |
26.27 |