メタデータ
| 項目 |
値 |
| Designation |
204P/LINEAR-NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-11T12:45:33.013440Z |
| Orbit solution date (soln_date, UTC) |
2024-05-07T15:48:38Z |
| Obs used |
1273 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
7.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-11-28.0000000 |
| e |
0.47217310 |
| q (au) |
1.929928 |
| a (au) |
3.656366 |
| i (deg) |
6.588859 |
| Ω (om, deg) |
109.072895 |
| ω (w, deg) |
355.047711 |
| M (ma, deg) |
306.638046 |
等級
散乱 + 全体線形
$$
M_a = (13.380 + 4.629\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.380 |
| n |
4.629 |
| gf |
1.000 |
| gb |
-0.796 |
| k |
0.998 |
| 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) |
| 2026-03-26 00:00 |
19:45:30.11 |
-20:46:12.2 |
HIP 97130 |
14.77 |
| 2026-03-26 12:00 |
19:45:44.71 |
-20:45:44.6 |
HIP 97130 |
18.20 |
| 2026-03-27 00:00 |
19:45:59.17 |
-20:45:17.4 |
HIP 97130 |
21.61 |
| 2026-03-27 12:00 |
19:46:13.48 |
-20:44:50.4 |
HIP 97130 |
24.98 |
| 2026-03-28 00:00 |
19:46:27.65 |
-20:44:23.8 |
HIP 97417 |
25.22 |
| 2026-03-28 12:00 |
19:46:41.67 |
-20:43:57.5 |
HIP 97417 |
22.74 |
| 2026-03-29 00:00 |
19:46:55.54 |
-20:43:31.5 |
HIP 97417 |
20.51 |
| 2026-03-29 12:00 |
19:47:09.27 |
-20:43:05.8 |
HIP 97417 |
18.61 |
| 2026-03-30 00:00 |
19:47:22.86 |
-20:42:40.4 |
HIP 97417 |
17.14 |
| 2026-03-30 12:00 |
19:47:36.29 |
-20:42:15.4 |
HIP 97417 |
16.17 |
| 2026-03-31 00:00 |
19:47:49.57 |
-20:41:50.7 |
HIP 97417 |
15.80 |
| 2026-03-31 12:00 |
19:48:02.71 |
-20:41:26.4 |
HIP 97417 |
16.03 |
| 2026-04-01 00:00 |
19:48:15.69 |
-20:41:02.4 |
HIP 97522 |
14.11 |
| 2026-04-01 12:00 |
19:48:28.53 |
-20:40:38.7 |
HIP 97522 |
11.26 |
| 2026-04-02 00:00 |
19:48:41.21 |
-20:40:15.4 |
HIP 97522 |
8.57 |
| 2026-04-02 12:00 |
19:48:53.73 |
-20:39:52.5 |
HIP 97522 |
6.17 |
| 2026-04-03 00:00 |
19:49:06.11 |
-20:39:29.9 |
HIP 97522 |
4.51 |
| 2026-04-03 12:00 |
19:49:18.33 |
-20:39:07.7 |
HIP 97522 |
4.42 |
| 2026-04-04 00:00 |
19:49:30.39 |
-20:38:45.9 |
HIP 97522 |
5.92 |
| 2026-04-04 12:00 |
19:49:42.30 |
-20:38:24.4 |
HIP 97559 |
6.37 |
| 2026-04-05 00:00 |
19:49:54.05 |
-20:38:03.3 |
HIP 97559 |
7.03 |
| 2026-04-05 12:00 |
19:50:05.64 |
-20:37:42.7 |
HIP 97559 |
8.56 |
| 2026-04-06 00:00 |
19:50:17.07 |
-20:37:22.3 |
HIP 97559 |
10.55 |
| 2026-04-06 12:00 |
19:50:28.35 |
-20:37:02.4 |
HIP 97559 |
12.77 |
| 2026-04-07 00:00 |
19:50:39.46 |
-20:36:42.9 |
HIP 97559 |
15.09 |
| 2026-04-07 12:00 |
19:50:50.41 |
-20:36:23.8 |
HIP 97559 |
17.47 |
| 2026-04-08 00:00 |
19:51:01.20 |
-20:36:05.1 |
HIP 97559 |
19.86 |
| 2026-04-08 12:00 |
19:51:11.83 |
-20:35:46.9 |
HIP 97559 |
22.24 |
| 2026-04-09 00:00 |
19:51:22.29 |
-20:35:29.0 |
HIP 97559 |
24.61 |
| 2026-04-09 12:00 |
19:51:32.58 |
-20:35:11.6 |
HIP 97559 |
26.96 |
| 2026-04-10 00:00 |
19:51:42.71 |
-20:34:54.6 |
HIP 97559 |
29.28 |
| 2026-04-10 12:00 |
19:51:52.68 |
-20:34:38.0 |
HIP 97899 |
28.86 |
| 2026-04-11 00:00 |
19:52:02.48 |
-20:34:21.9 |
HIP 97899 |
26.69 |
| 2026-04-11 12:00 |
19:52:12.10 |
-20:34:06.2 |
HIP 97899 |
24.58 |
| 2026-04-12 00:00 |
19:52:21.56 |
-20:33:50.9 |
HIP 97899 |
22.54 |
| 2026-04-12 12:00 |
19:52:30.85 |
-20:33:36.1 |
HIP 97899 |
20.58 |
| 2026-04-13 00:00 |
19:52:39.97 |
-20:33:21.8 |
HIP 97899 |
18.71 |
| 2026-04-13 12:00 |
19:52:48.91 |
-20:33:07.9 |
HIP 97899 |
16.94 |
| 2026-04-14 00:00 |
19:52:57.68 |
-20:32:54.5 |
HIP 97899 |
15.28 |
| 2026-04-14 12:00 |
19:53:06.28 |
-20:32:41.5 |
HIP 97899 |
13.77 |
| 2026-04-15 00:00 |
19:53:14.71 |
-20:32:29.1 |
HIP 97899 |
12.44 |
| 2026-04-15 12:00 |
19:53:22.95 |
-20:32:17.1 |
HIP 97899 |
11.32 |
| 2026-04-16 00:00 |
19:53:31.03 |
-20:32:05.6 |
HIP 97899 |
10.47 |