メタデータ
| 項目 |
値 |
| Designation |
C/2007 D1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-06-18T20:48:33.595200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:04Z |
| Obs used |
525 |
| NEO |
- |
| M1 |
8.900 |
| 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) |
2008-06-26.0000000 |
| e |
0.99994869 |
| q (au) |
8.793366 |
| a (au) |
171366.674364 |
| i (deg) |
41.507013 |
| Ω (om, deg) |
171.084868 |
| ω (w, deg) |
340.143581 |
| M (ma, deg) |
0.000005 |
等級
散乱 + 全体線形
$$
M_a = (10.938 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.938 |
| n |
2.000 |
| gf |
0.962 |
| gb |
-0.666 |
| k |
0.800 |
| δ90 |
8.408 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
18:03:48.08 |
+18:28:12.8 |
HIP 88503 |
21.08 |
| 2026-07-29 12:00 |
18:03:45.52 |
+18:27:51.2 |
HIP 88503 |
21.64 |
| 2026-07-30 00:00 |
18:03:42.97 |
+18:27:29.3 |
HIP 88503 |
22.21 |
| 2026-07-30 12:00 |
18:03:40.44 |
+18:27:07.1 |
HIP 88503 |
22.80 |
| 2026-07-31 00:00 |
18:03:37.93 |
+18:26:44.8 |
HIP 88503 |
23.38 |
| 2026-07-31 12:00 |
18:03:35.45 |
+18:26:22.2 |
HIP 88503 |
23.98 |
| 2026-08-01 00:00 |
18:03:32.98 |
+18:25:59.3 |
HIP 88503 |
24.59 |
| 2026-08-01 12:00 |
18:03:30.53 |
+18:25:36.3 |
HIP 88503 |
25.20 |
| 2026-08-02 00:00 |
18:03:28.10 |
+18:25:13.0 |
HIP 88503 |
25.81 |
| 2026-08-02 12:00 |
18:03:25.70 |
+18:24:49.5 |
HIP 88503 |
26.43 |
| 2026-08-03 00:00 |
18:03:23.31 |
+18:24:25.7 |
HIP 88503 |
27.05 |
| 2026-08-03 12:00 |
18:03:20.94 |
+18:24:01.8 |
HIP 88503 |
27.68 |
| 2026-08-04 00:00 |
18:03:18.60 |
+18:23:37.6 |
HIP 88503 |
28.31 |
| 2026-08-04 12:00 |
18:03:16.28 |
+18:23:13.2 |
HIP 88503 |
28.95 |
| 2026-08-05 00:00 |
18:03:13.98 |
+18:22:48.5 |
HIP 88503 |
29.58 |
| 2026-08-05 12:00 |
18:03:11.70 |
+18:22:23.7 |
HIP 88503 |
30.22 |
| 2026-08-06 00:00 |
18:03:09.44 |
+18:21:58.6 |
HIP 88503 |
30.87 |
| 2026-08-06 12:00 |
18:03:07.21 |
+18:21:33.4 |
HIP 88503 |
31.51 |
| 2026-08-07 00:00 |
18:03:04.99 |
+18:21:07.9 |
HIP 88503 |
32.15 |
| 2026-08-07 12:00 |
18:03:02.81 |
+18:20:42.2 |
HIP 88503 |
32.80 |
| 2026-08-08 00:00 |
18:03:00.64 |
+18:20:16.3 |
HIP 88503 |
33.44 |
| 2026-08-08 12:00 |
18:02:58.49 |
+18:19:50.2 |
HIP 88503 |
34.09 |
| 2026-08-09 00:00 |
18:02:56.37 |
+18:19:23.8 |
HIP 88503 |
34.74 |
| 2026-08-09 12:00 |
18:02:54.28 |
+18:18:57.3 |
HIP 88503 |
35.39 |
| 2026-08-10 00:00 |
18:02:52.20 |
+18:18:30.6 |
HIP 88503 |
36.03 |
| 2026-08-10 12:00 |
18:02:50.15 |
+18:18:03.7 |
HIP 88503 |
36.68 |
| 2026-08-11 00:00 |
18:02:48.13 |
+18:17:36.6 |
HIP 88503 |
37.33 |
| 2026-08-11 12:00 |
18:02:46.13 |
+18:17:09.3 |
HIP 88503 |
37.98 |
| 2026-08-12 00:00 |
18:02:44.15 |
+18:16:41.8 |
HIP 88503 |
38.62 |
| 2026-08-12 12:00 |
18:02:42.20 |
+18:16:14.1 |
HIP 88503 |
39.27 |
| 2026-08-13 00:00 |
18:02:40.27 |
+18:15:46.2 |
HIP 88503 |
39.92 |
| 2026-08-13 12:00 |
18:02:38.37 |
+18:15:18.1 |
HIP 88430 |
39.83 |
| 2026-08-14 00:00 |
18:02:36.49 |
+18:14:49.9 |
HIP 88430 |
39.47 |
| 2026-08-14 12:00 |
18:02:34.64 |
+18:14:21.4 |
HIP 88430 |
39.12 |
| 2026-08-15 00:00 |
18:02:32.82 |
+18:13:52.8 |
HIP 88430 |
38.77 |
| 2026-08-15 12:00 |
18:02:31.02 |
+18:13:24.1 |
HIP 88430 |
38.43 |
| 2026-08-16 00:00 |
18:02:29.24 |
+18:12:55.1 |
HIP 88430 |
38.08 |
| 2026-08-16 12:00 |
18:02:27.49 |
+18:12:26.0 |
HIP 88430 |
37.74 |
| 2026-08-17 00:00 |
18:02:25.77 |
+18:11:56.7 |
HIP 88430 |
37.41 |
| 2026-08-17 12:00 |
18:02:24.08 |
+18:11:27.2 |
HIP 88430 |
37.07 |
| 2026-08-18 00:00 |
18:02:22.41 |
+18:10:57.6 |
HIP 88430 |
36.74 |
| 2026-08-18 12:00 |
18:02:20.77 |
+18:10:27.8 |
HIP 88430 |
36.42 |
| 2026-08-19 00:00 |
18:02:19.15 |
+18:09:57.9 |
HIP 88430 |
36.09 |