C/2004 R2 (ASAS)
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) |
| 2026-02-03 00:00 |
00:04:11.25 |
+00:55:15.0 |
HIP 416 |
14.82 |
| 2026-02-03 12:00 |
00:04:12.97 |
+00:55:25.5 |
HIP 416 |
14.36 |
| 2026-02-04 00:00 |
00:04:14.72 |
+00:55:36.2 |
HIP 416 |
13.89 |
| 2026-02-04 12:00 |
00:04:16.48 |
+00:55:46.9 |
HIP 416 |
13.42 |
| 2026-02-05 00:00 |
00:04:18.25 |
+00:55:57.7 |
HIP 416 |
12.94 |
| 2026-02-05 12:00 |
00:04:20.04 |
+00:56:08.7 |
HIP 416 |
12.46 |
| 2026-02-06 00:00 |
00:04:21.84 |
+00:56:19.7 |
HIP 416 |
11.98 |
| 2026-02-06 12:00 |
00:04:23.66 |
+00:56:30.9 |
HIP 416 |
11.49 |
| 2026-02-07 00:00 |
00:04:25.49 |
+00:56:42.1 |
HIP 416 |
11.00 |
| 2026-02-07 12:00 |
00:04:27.34 |
+00:56:53.5 |
HIP 416 |
10.51 |
| 2026-02-08 00:00 |
00:04:29.20 |
+00:57:04.9 |
HIP 416 |
10.01 |
| 2026-02-08 12:00 |
00:04:31.07 |
+00:57:16.4 |
HIP 416 |
9.51 |
| 2026-02-09 00:00 |
00:04:32.96 |
+00:57:28.0 |
HIP 416 |
9.01 |
| 2026-02-09 12:00 |
00:04:34.86 |
+00:57:39.7 |
HIP 416 |
8.50 |
| 2026-02-10 00:00 |
00:04:36.78 |
+00:57:51.5 |
HIP 416 |
7.99 |
| 2026-02-10 12:00 |
00:04:38.71 |
+00:58:03.4 |
HIP 416 |
7.48 |
| 2026-02-11 00:00 |
00:04:40.65 |
+00:58:15.4 |
HIP 416 |
6.97 |
| 2026-02-11 12:00 |
00:04:42.61 |
+00:58:27.5 |
HIP 416 |
6.46 |
| 2026-02-12 00:00 |
00:04:44.58 |
+00:58:39.6 |
HIP 416 |
5.94 |
| 2026-02-12 12:00 |
00:04:46.56 |
+00:58:51.9 |
HIP 416 |
5.42 |
| 2026-02-13 00:00 |
00:04:48.56 |
+00:59:04.2 |
HIP 416 |
4.91 |
| 2026-02-13 12:00 |
00:04:50.57 |
+00:59:16.6 |
HIP 416 |
4.40 |
| 2026-02-14 00:00 |
00:04:52.59 |
+00:59:29.1 |
HIP 416 |
3.89 |
| 2026-02-14 12:00 |
00:04:54.62 |
+00:59:41.7 |
HIP 416 |
3.39 |
| 2026-02-15 00:00 |
00:04:56.67 |
+00:59:54.4 |
HIP 416 |
2.91 |
| 2026-02-15 12:00 |
00:04:58.73 |
+01:00:07.1 |
HIP 416 |
2.45 |
| 2026-02-16 00:00 |
00:05:00.80 |
+01:00:20.0 |
HIP 416 |
2.05 |
| 2026-02-16 12:00 |
00:05:02.88 |
+01:00:32.9 |
HIP 416 |
1.73 |
| 2026-02-17 00:00 |
00:05:04.97 |
+01:00:45.9 |
HIP 416 |
1.55 |
| 2026-02-17 12:00 |
00:05:07.07 |
+01:00:58.9 |
HIP 416 |
1.57 |
| 2026-02-18 00:00 |
00:05:09.19 |
+01:01:12.1 |
HIP 416 |
1.79 |
| 2026-02-18 12:00 |
00:05:11.32 |
+01:01:25.3 |
HIP 416 |
2.14 |
| 2026-02-19 00:00 |
00:05:13.45 |
+01:01:38.6 |
HIP 416 |
2.58 |
| 2026-02-19 12:00 |
00:05:15.60 |
+01:01:51.9 |
HIP 416 |
3.06 |
| 2026-02-20 00:00 |
00:05:17.76 |
+01:02:05.3 |
HIP 416 |
3.58 |
| 2026-02-20 12:00 |
00:05:19.93 |
+01:02:18.8 |
HIP 416 |
4.12 |
| 2026-02-21 00:00 |
00:05:22.11 |
+01:02:32.4 |
HIP 416 |
4.67 |
| 2026-02-21 12:00 |
00:05:24.30 |
+01:02:46.0 |
HIP 416 |
5.23 |
| 2026-02-22 00:00 |
00:05:26.50 |
+01:02:59.7 |
HIP 416 |
5.81 |
| 2026-02-22 12:00 |
00:05:28.71 |
+01:03:13.5 |
HIP 416 |
6.38 |
| 2026-02-23 00:00 |
00:05:30.93 |
+01:03:27.3 |
HIP 416 |
6.97 |
| 2026-02-23 12:00 |
00:05:33.15 |
+01:03:41.2 |
HIP 416 |
7.56 |
| 2026-02-24 00:00 |
00:05:35.39 |
+01:03:55.2 |
HIP 416 |
8.15 |