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) |
| 2026-07-29 00:00 |
19:19:23.45 |
-22:37:23.0 |
HIP 95077 |
21.74 |
| 2026-07-29 12:00 |
19:19:05.11 |
-22:38:11.4 |
HIP 95077 |
25.66 |
| 2026-07-30 00:00 |
19:18:46.86 |
-22:38:59.5 |
HIP 94821 |
22.18 |
| 2026-07-30 12:00 |
19:18:28.71 |
-22:39:47.2 |
HIP 94821 |
18.83 |
| 2026-07-31 00:00 |
19:18:10.64 |
-22:40:34.6 |
HIP 94821 |
15.93 |
| 2026-07-31 12:00 |
19:17:52.68 |
-22:41:21.7 |
HIP 94821 |
13.75 |
| 2026-08-01 00:00 |
19:17:34.81 |
-22:42:08.3 |
HIP 94821 |
12.66 |
| 2026-08-01 12:00 |
19:17:17.05 |
-22:42:54.6 |
HIP 94821 |
12.90 |
| 2026-08-02 00:00 |
19:16:59.39 |
-22:43:40.6 |
HIP 94821 |
14.38 |
| 2026-08-02 12:00 |
19:16:41.83 |
-22:44:26.2 |
HIP 94821 |
16.77 |
| 2026-08-03 00:00 |
19:16:24.39 |
-22:45:11.4 |
HIP 94821 |
19.71 |
| 2026-08-03 12:00 |
19:16:07.06 |
-22:45:56.3 |
HIP 94821 |
22.98 |
| 2026-08-04 00:00 |
19:15:49.84 |
-22:46:40.7 |
HIP 94821 |
26.45 |
| 2026-08-04 12:00 |
19:15:32.74 |
-22:47:24.9 |
HIP 94494 |
23.41 |
| 2026-08-05 00:00 |
19:15:15.75 |
-22:48:08.6 |
HIP 94494 |
19.51 |
| 2026-08-05 12:00 |
19:14:58.89 |
-22:48:51.9 |
HIP 94494 |
15.68 |
| 2026-08-06 00:00 |
19:14:42.16 |
-22:49:34.9 |
HIP 94494 |
11.97 |
| 2026-08-06 12:00 |
19:14:25.55 |
-22:50:17.5 |
HIP 94494 |
8.47 |
| 2026-08-07 00:00 |
19:14:09.07 |
-22:50:59.7 |
HIP 94494 |
5.53 |
| 2026-08-07 12:00 |
19:13:52.72 |
-22:51:41.5 |
HIP 94494 |
4.39 |
| 2026-08-08 00:00 |
19:13:36.50 |
-22:52:23.0 |
HIP 94494 |
6.09 |
| 2026-08-08 12:00 |
19:13:20.42 |
-22:53:04.0 |
HIP 94494 |
9.12 |
| 2026-08-09 00:00 |
19:13:04.48 |
-22:53:44.7 |
HIP 94494 |
12.52 |
| 2026-08-09 12:00 |
19:12:48.68 |
-22:54:24.9 |
HIP 94494 |
16.04 |
| 2026-08-10 00:00 |
19:12:33.03 |
-22:55:04.8 |
HIP 94494 |
19.60 |
| 2026-08-10 12:00 |
19:12:17.52 |
-22:55:44.2 |
HIP 94494 |
23.15 |
| 2026-08-11 00:00 |
19:12:02.15 |
-22:56:23.3 |
HIP 94494 |
26.69 |
| 2026-08-11 12:00 |
19:11:46.94 |
-22:57:01.9 |
HIP 94494 |
30.21 |
| 2026-08-12 00:00 |
19:11:31.88 |
-22:57:40.2 |
HIP 94122 |
30.27 |
| 2026-08-12 12:00 |
19:11:16.98 |
-22:58:18.0 |
HIP 94122 |
26.95 |
| 2026-08-13 00:00 |
19:11:02.23 |
-22:58:55.5 |
HIP 94122 |
23.71 |
| 2026-08-13 12:00 |
19:10:47.64 |
-22:59:32.5 |
HIP 94122 |
20.57 |
| 2026-08-14 00:00 |
19:10:33.21 |
-23:00:09.2 |
HIP 94122 |
17.57 |
| 2026-08-14 12:00 |
19:10:18.95 |
-23:00:45.4 |
HIP 94122 |
14.77 |
| 2026-08-15 00:00 |
19:10:04.85 |
-23:01:21.2 |
HIP 94122 |
12.25 |
| 2026-08-15 12:00 |
19:09:50.91 |
-23:01:56.6 |
HIP 94122 |
10.22 |
| 2026-08-16 00:00 |
19:09:37.15 |
-23:02:31.6 |
HIP 94122 |
8.95 |
| 2026-08-16 12:00 |
19:09:23.55 |
-23:03:06.2 |
HIP 94122 |
8.74 |
| 2026-08-17 00:00 |
19:09:10.13 |
-23:03:40.3 |
HIP 94122 |
9.62 |
| 2026-08-17 12:00 |
19:08:56.88 |
-23:04:14.1 |
HIP 94041 |
7.73 |
| 2026-08-18 00:00 |
19:08:43.81 |
-23:04:47.4 |
HIP 94041 |
6.63 |
| 2026-08-18 12:00 |
19:08:30.91 |
-23:05:20.4 |
HIP 94041 |
6.83 |
| 2026-08-19 00:00 |
19:08:18.19 |
-23:05:52.9 |
HIP 94041 |
8.19 |