C/1907 L2 (Daniel)
メタデータ
| 項目 |
値 |
| Designation |
C/1907 L2 (Daniel) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1907-09-04T11:05:22.588800Z |
| Orbit solution date (soln_date, UTC) |
2021-05-03T17:43:15Z |
| Obs used |
173 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1907-09-27.0000000 |
| e |
0.99876748 |
| q (au) |
0.512178 |
| a (au) |
415.554273 |
| i (deg) |
8.957993 |
| Ω (om, deg) |
144.267134 |
| ω (w, deg) |
294.470456 |
| M (ma, deg) |
0.002622 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-02-03 00:00 |
16:50:00.89 |
-13:54:48.3 |
HIP 82472 |
26.34 |
| 2026-02-03 12:00 |
16:50:01.37 |
-13:54:47.4 |
HIP 82472 |
26.25 |
| 2026-02-04 00:00 |
16:50:01.85 |
-13:54:46.4 |
HIP 82472 |
26.15 |
| 2026-02-04 12:00 |
16:50:02.32 |
-13:54:45.4 |
HIP 82472 |
26.06 |
| 2026-02-05 00:00 |
16:50:02.78 |
-13:54:44.4 |
HIP 82472 |
25.97 |
| 2026-02-05 12:00 |
16:50:03.24 |
-13:54:43.4 |
HIP 82472 |
25.89 |
| 2026-02-06 00:00 |
16:50:03.69 |
-13:54:42.4 |
HIP 82472 |
25.80 |
| 2026-02-06 12:00 |
16:50:04.13 |
-13:54:41.3 |
HIP 82472 |
25.71 |
| 2026-02-07 00:00 |
16:50:04.57 |
-13:54:40.2 |
HIP 82472 |
25.63 |
| 2026-02-07 12:00 |
16:50:04.99 |
-13:54:39.1 |
HIP 82472 |
25.54 |
| 2026-02-08 00:00 |
16:50:05.41 |
-13:54:38.0 |
HIP 82472 |
25.46 |
| 2026-02-08 12:00 |
16:50:05.83 |
-13:54:36.8 |
HIP 82472 |
25.38 |
| 2026-02-09 00:00 |
16:50:06.23 |
-13:54:35.6 |
HIP 82472 |
25.30 |
| 2026-02-09 12:00 |
16:50:06.63 |
-13:54:34.4 |
HIP 82472 |
25.22 |
| 2026-02-10 00:00 |
16:50:07.02 |
-13:54:33.2 |
HIP 82472 |
25.14 |
| 2026-02-10 12:00 |
16:50:07.40 |
-13:54:32.0 |
HIP 82472 |
25.06 |
| 2026-02-11 00:00 |
16:50:07.78 |
-13:54:30.7 |
HIP 82472 |
24.99 |
| 2026-02-11 12:00 |
16:50:08.14 |
-13:54:29.5 |
HIP 82472 |
24.91 |
| 2026-02-12 00:00 |
16:50:08.50 |
-13:54:28.2 |
HIP 82472 |
24.84 |
| 2026-02-12 12:00 |
16:50:08.86 |
-13:54:26.9 |
HIP 82472 |
24.76 |
| 2026-02-13 00:00 |
16:50:09.20 |
-13:54:25.5 |
HIP 82472 |
24.69 |
| 2026-02-13 12:00 |
16:50:09.54 |
-13:54:24.2 |
HIP 82472 |
24.62 |
| 2026-02-14 00:00 |
16:50:09.87 |
-13:54:22.8 |
HIP 82472 |
24.55 |
| 2026-02-14 12:00 |
16:50:10.19 |
-13:54:21.4 |
HIP 82472 |
24.48 |
| 2026-02-15 00:00 |
16:50:10.50 |
-13:54:20.0 |
HIP 82472 |
24.42 |
| 2026-02-15 12:00 |
16:50:10.80 |
-13:54:18.6 |
HIP 82472 |
24.35 |
| 2026-02-16 00:00 |
16:50:11.10 |
-13:54:17.1 |
HIP 82472 |
24.28 |
| 2026-02-16 12:00 |
16:50:11.39 |
-13:54:15.6 |
HIP 82472 |
24.22 |
| 2026-02-17 00:00 |
16:50:11.67 |
-13:54:14.1 |
HIP 82472 |
24.16 |
| 2026-02-17 12:00 |
16:50:11.95 |
-13:54:12.6 |
HIP 82472 |
24.09 |
| 2026-02-18 00:00 |
16:50:12.21 |
-13:54:11.1 |
HIP 82472 |
24.03 |
| 2026-02-18 12:00 |
16:50:12.47 |
-13:54:09.6 |
HIP 82472 |
23.97 |
| 2026-02-19 00:00 |
16:50:12.72 |
-13:54:08.0 |
HIP 82472 |
23.91 |
| 2026-02-19 12:00 |
16:50:12.96 |
-13:54:06.4 |
HIP 82472 |
23.86 |
| 2026-02-20 00:00 |
16:50:13.20 |
-13:54:04.8 |
HIP 82472 |
23.80 |
| 2026-02-20 12:00 |
16:50:13.42 |
-13:54:03.2 |
HIP 82472 |
23.74 |
| 2026-02-21 00:00 |
16:50:13.64 |
-13:54:01.5 |
HIP 82472 |
23.69 |
| 2026-02-21 12:00 |
16:50:13.85 |
-13:53:59.9 |
HIP 82472 |
23.63 |
| 2026-02-22 00:00 |
16:50:14.05 |
-13:53:58.2 |
HIP 82472 |
23.58 |
| 2026-02-22 12:00 |
16:50:14.24 |
-13:53:56.5 |
HIP 82472 |
23.53 |
| 2026-02-23 00:00 |
16:50:14.43 |
-13:53:54.8 |
HIP 82472 |
23.48 |
| 2026-02-23 12:00 |
16:50:14.60 |
-13:53:53.1 |
HIP 82472 |
23.43 |
| 2026-02-24 00:00 |
16:50:14.77 |
-13:53:51.3 |
HIP 82472 |
23.38 |