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) |
| 2026-05-12 00:00 |
19:56:12.87 |
-20:34:29.6 |
HIP 98084 |
5.68 |
| 2026-05-12 12:00 |
19:56:10.79 |
-20:34:47.6 |
HIP 98084 |
5.74 |
| 2026-05-13 00:00 |
19:56:08.50 |
-20:35:06.3 |
HIP 98084 |
5.85 |
| 2026-05-13 12:00 |
19:56:06.02 |
-20:35:25.6 |
HIP 98084 |
6.02 |
| 2026-05-14 00:00 |
19:56:03.33 |
-20:35:45.5 |
HIP 98084 |
6.26 |
| 2026-05-14 12:00 |
19:56:00.43 |
-20:36:05.9 |
HIP 98084 |
6.59 |
| 2026-05-15 00:00 |
19:55:57.33 |
-20:36:27.0 |
HIP 98084 |
6.99 |
| 2026-05-15 12:00 |
19:55:54.03 |
-20:36:48.7 |
HIP 98084 |
7.49 |
| 2026-05-16 00:00 |
19:55:50.52 |
-20:37:11.0 |
HIP 98084 |
8.07 |
| 2026-05-16 12:00 |
19:55:46.81 |
-20:37:33.9 |
HIP 98084 |
8.73 |
| 2026-05-17 00:00 |
19:55:42.89 |
-20:37:57.4 |
HIP 98084 |
9.47 |
| 2026-05-17 12:00 |
19:55:38.77 |
-20:38:21.4 |
HIP 98084 |
10.28 |
| 2026-05-18 00:00 |
19:55:34.45 |
-20:38:46.1 |
HIP 98084 |
11.17 |
| 2026-05-18 12:00 |
19:55:29.92 |
-20:39:11.4 |
HIP 98084 |
12.13 |
| 2026-05-19 00:00 |
19:55:25.19 |
-20:39:37.2 |
HIP 98084 |
13.16 |
| 2026-05-19 12:00 |
19:55:20.26 |
-20:40:03.7 |
HIP 98084 |
14.25 |
| 2026-05-20 00:00 |
19:55:15.12 |
-20:40:30.8 |
HIP 98084 |
15.40 |
| 2026-05-20 12:00 |
19:55:09.79 |
-20:40:58.4 |
HIP 98084 |
16.61 |
| 2026-05-21 00:00 |
19:55:04.25 |
-20:41:26.6 |
HIP 98084 |
17.88 |
| 2026-05-21 12:00 |
19:54:58.50 |
-20:41:55.4 |
HIP 98084 |
19.21 |
| 2026-05-22 00:00 |
19:54:52.56 |
-20:42:24.8 |
HIP 98084 |
20.60 |
| 2026-05-22 12:00 |
19:54:46.42 |
-20:42:54.7 |
HIP 98084 |
22.04 |
| 2026-05-23 00:00 |
19:54:40.08 |
-20:43:25.2 |
HIP 98084 |
23.53 |
| 2026-05-23 12:00 |
19:54:33.54 |
-20:43:56.3 |
HIP 97899 |
24.83 |
| 2026-05-24 00:00 |
19:54:26.79 |
-20:44:28.0 |
HIP 97899 |
24.60 |
| 2026-05-24 12:00 |
19:54:19.85 |
-20:45:00.2 |
HIP 97899 |
24.48 |
| 2026-05-25 00:00 |
19:54:12.72 |
-20:45:33.0 |
HIP 97899 |
24.48 |
| 2026-05-25 12:00 |
19:54:05.38 |
-20:46:06.3 |
HIP 97899 |
24.60 |
| 2026-05-26 00:00 |
19:53:57.85 |
-20:46:40.2 |
HIP 97836 |
23.07 |
| 2026-05-26 12:00 |
19:53:50.12 |
-20:47:14.6 |
HIP 97836 |
21.47 |
| 2026-05-27 00:00 |
19:53:42.19 |
-20:47:49.6 |
HIP 97836 |
19.89 |
| 2026-05-27 12:00 |
19:53:34.07 |
-20:48:25.1 |
HIP 97836 |
18.34 |
| 2026-05-28 00:00 |
19:53:25.75 |
-20:49:01.2 |
HIP 97836 |
16.86 |
| 2026-05-28 12:00 |
19:53:17.24 |
-20:49:37.7 |
HIP 97836 |
15.47 |
| 2026-05-29 00:00 |
19:53:08.54 |
-20:50:14.9 |
HIP 97836 |
14.24 |
| 2026-05-29 12:00 |
19:52:59.64 |
-20:50:52.5 |
HIP 97836 |
13.22 |
| 2026-05-30 00:00 |
19:52:50.55 |
-20:51:30.7 |
HIP 97836 |
12.49 |
| 2026-05-30 12:00 |
19:52:41.27 |
-20:52:09.4 |
HIP 97836 |
12.12 |
| 2026-05-31 00:00 |
19:52:31.80 |
-20:52:48.5 |
HIP 97836 |
12.19 |
| 2026-05-31 12:00 |
19:52:22.14 |
-20:53:28.3 |
HIP 97836 |
12.69 |
| 2026-06-01 00:00 |
19:52:12.29 |
-20:54:08.5 |
HIP 97836 |
13.62 |
| 2026-06-01 12:00 |
19:52:02.25 |
-20:54:49.2 |
HIP 97836 |
14.90 |
| 2026-06-02 00:00 |
19:51:52.02 |
-20:55:30.4 |
HIP 97836 |
16.48 |