メタデータ
| 項目 |
値 |
| Designation |
C/2004 R2 (ASAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-10-07T21:32:12.880320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:42Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
6.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2004-09-15.0000000 |
| e |
0.99999993 |
| q (au) |
0.112836 |
| a (au) |
1619082.250620 |
| i (deg) |
63.173694 |
| Ω (om, deg) |
182.463575 |
| ω (w, deg) |
5.353183 |
| M (ma, deg) |
360.000000 |
等級
散乱 + 全体線形
$$
M_a = (11.995 + 2.096\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.995 |
| n |
2.096 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
00:12:19.12 |
+01:46:31.4 |
HIP 870 |
29.78 |
| 2026-06-01 12:00 |
00:12:20.10 |
+01:46:37.6 |
HIP 870 |
29.92 |
| 2026-06-02 00:00 |
00:12:21.07 |
+01:46:43.7 |
HIP 870 |
30.07 |
| 2026-06-02 12:00 |
00:12:22.01 |
+01:46:49.7 |
HIP 870 |
30.21 |
| 2026-06-03 00:00 |
00:12:22.94 |
+01:46:55.6 |
HIP 870 |
30.35 |
| 2026-06-03 12:00 |
00:12:23.84 |
+01:47:01.3 |
HIP 870 |
30.49 |
| 2026-06-04 00:00 |
00:12:24.73 |
+01:47:06.9 |
HIP 870 |
30.63 |
| 2026-06-04 12:00 |
00:12:25.60 |
+01:47:12.4 |
HIP 870 |
30.77 |
| 2026-06-05 00:00 |
00:12:26.45 |
+01:47:17.8 |
HIP 870 |
30.90 |
| 2026-06-05 12:00 |
00:12:27.28 |
+01:47:23.0 |
HIP 870 |
31.03 |
| 2026-06-06 00:00 |
00:12:28.09 |
+01:47:28.1 |
HIP 870 |
31.16 |
| 2026-06-06 12:00 |
00:12:28.88 |
+01:47:33.1 |
HIP 870 |
31.29 |
| 2026-06-07 00:00 |
00:12:29.65 |
+01:47:38.0 |
HIP 1107 |
31.39 |
| 2026-06-07 12:00 |
00:12:30.40 |
+01:47:42.7 |
HIP 1107 |
31.34 |
| 2026-06-08 00:00 |
00:12:31.14 |
+01:47:47.4 |
HIP 1107 |
31.28 |
| 2026-06-08 12:00 |
00:12:31.85 |
+01:47:51.9 |
HIP 1107 |
31.23 |
| 2026-06-09 00:00 |
00:12:32.55 |
+01:47:56.2 |
HIP 1107 |
31.19 |
| 2026-06-09 12:00 |
00:12:33.22 |
+01:48:00.5 |
HIP 1107 |
31.14 |
| 2026-06-10 00:00 |
00:12:33.87 |
+01:48:04.6 |
HIP 1107 |
31.10 |
| 2026-06-10 12:00 |
00:12:34.51 |
+01:48:08.6 |
HIP 1107 |
31.06 |
| 2026-06-11 00:00 |
00:12:35.12 |
+01:48:12.4 |
HIP 1107 |
31.02 |
| 2026-06-11 12:00 |
00:12:35.72 |
+01:48:16.1 |
HIP 1107 |
30.99 |
| 2026-06-12 00:00 |
00:12:36.29 |
+01:48:19.7 |
HIP 1107 |
30.95 |
| 2026-06-12 12:00 |
00:12:36.85 |
+01:48:23.2 |
HIP 1107 |
30.92 |
| 2026-06-13 00:00 |
00:12:37.38 |
+01:48:26.5 |
HIP 1107 |
30.89 |
| 2026-06-13 12:00 |
00:12:37.90 |
+01:48:29.7 |
HIP 1107 |
30.86 |
| 2026-06-14 00:00 |
00:12:38.39 |
+01:48:32.8 |
HIP 1107 |
30.84 |
| 2026-06-14 12:00 |
00:12:38.86 |
+01:48:35.7 |
HIP 1107 |
30.81 |
| 2026-06-15 00:00 |
00:12:39.32 |
+01:48:38.6 |
HIP 1107 |
30.79 |
| 2026-06-15 12:00 |
00:12:39.75 |
+01:48:41.2 |
HIP 1107 |
30.76 |
| 2026-06-16 00:00 |
00:12:40.16 |
+01:48:43.8 |
HIP 1107 |
30.74 |
| 2026-06-16 12:00 |
00:12:40.56 |
+01:48:46.2 |
HIP 1107 |
30.72 |
| 2026-06-17 00:00 |
00:12:40.93 |
+01:48:48.5 |
HIP 1107 |
30.70 |
| 2026-06-17 12:00 |
00:12:41.28 |
+01:48:50.6 |
HIP 1107 |
30.69 |
| 2026-06-18 00:00 |
00:12:41.61 |
+01:48:52.6 |
HIP 1107 |
30.67 |
| 2026-06-18 12:00 |
00:12:41.92 |
+01:48:54.5 |
HIP 1107 |
30.65 |
| 2026-06-19 00:00 |
00:12:42.21 |
+01:48:56.3 |
HIP 1107 |
30.64 |
| 2026-06-19 12:00 |
00:12:42.48 |
+01:48:57.9 |
HIP 1107 |
30.63 |
| 2026-06-20 00:00 |
00:12:42.73 |
+01:48:59.4 |
HIP 1107 |
30.62 |
| 2026-06-20 12:00 |
00:12:42.95 |
+01:49:00.7 |
HIP 1107 |
30.60 |
| 2026-06-21 00:00 |
00:12:43.16 |
+01:49:01.9 |
HIP 1107 |
30.59 |
| 2026-06-21 12:00 |
00:12:43.35 |
+01:49:03.0 |
HIP 1107 |
30.59 |
| 2026-06-22 00:00 |
00:12:43.51 |
+01:49:04.0 |
HIP 1107 |
30.58 |