メタデータ
| 項目 |
値 |
| Designation |
C/2002 J4 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-10-03T04:21:57.335040Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:21Z |
| Obs used |
228 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-04-06.0000000 |
| e |
0.99989069 |
| q (au) |
3.633732 |
| a (au) |
33243.727305 |
| i (deg) |
46.525144 |
| Ω (om, deg) |
70.884245 |
| ω (w, deg) |
230.709337 |
| M (ma, deg) |
359.999971 |
等級
散乱 + 全体線形
$$
M_a = (8.255 + 3.626\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.255 |
| n |
3.626 |
| gf |
0.984 |
| gb |
-0.894 |
| k |
0.999 |
| δ90 |
9.909 |
| 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 |
05:16:17.86 |
+34:43:34.1 |
HIP 24538 |
18.86 |
| 2026-03-26 12:00 |
05:16:18.87 |
+34:43:28.6 |
HIP 24538 |
18.83 |
| 2026-03-27 00:00 |
05:16:19.92 |
+34:43:23.3 |
HIP 24538 |
18.80 |
| 2026-03-27 12:00 |
05:16:20.99 |
+34:43:17.9 |
HIP 24538 |
18.79 |
| 2026-03-28 00:00 |
05:16:22.09 |
+34:43:12.7 |
HIP 24538 |
18.77 |
| 2026-03-28 12:00 |
05:16:23.21 |
+34:43:07.4 |
HIP 24538 |
18.76 |
| 2026-03-29 00:00 |
05:16:24.37 |
+34:43:02.3 |
HIP 24538 |
18.76 |
| 2026-03-29 12:00 |
05:16:25.55 |
+34:42:57.1 |
HIP 24538 |
18.77 |
| 2026-03-30 00:00 |
05:16:26.76 |
+34:42:52.1 |
HIP 24538 |
18.78 |
| 2026-03-30 12:00 |
05:16:28.00 |
+34:42:47.0 |
HIP 24538 |
18.80 |
| 2026-03-31 00:00 |
05:16:29.26 |
+34:42:42.1 |
HIP 24538 |
18.82 |
| 2026-03-31 12:00 |
05:16:30.55 |
+34:42:37.1 |
HIP 24538 |
18.85 |
| 2026-04-01 00:00 |
05:16:31.87 |
+34:42:32.3 |
HIP 24538 |
18.89 |
| 2026-04-01 12:00 |
05:16:33.21 |
+34:42:27.5 |
HIP 24538 |
18.94 |
| 2026-04-02 00:00 |
05:16:34.59 |
+34:42:22.7 |
HIP 24538 |
18.99 |
| 2026-04-02 12:00 |
05:16:35.98 |
+34:42:18.0 |
HIP 24538 |
19.05 |
| 2026-04-03 00:00 |
05:16:37.41 |
+34:42:13.3 |
HIP 24538 |
19.12 |
| 2026-04-03 12:00 |
05:16:38.86 |
+34:42:08.7 |
HIP 24538 |
19.20 |
| 2026-04-04 00:00 |
05:16:40.33 |
+34:42:04.2 |
HIP 24538 |
19.28 |
| 2026-04-04 12:00 |
05:16:41.84 |
+34:41:59.7 |
HIP 24538 |
19.38 |
| 2026-04-05 00:00 |
05:16:43.36 |
+34:41:55.2 |
HIP 24538 |
19.48 |
| 2026-04-05 12:00 |
05:16:44.92 |
+34:41:50.9 |
HIP 24538 |
19.59 |
| 2026-04-06 00:00 |
05:16:46.50 |
+34:41:46.5 |
HIP 24538 |
19.71 |
| 2026-04-06 12:00 |
05:16:48.10 |
+34:41:42.3 |
HIP 24538 |
19.84 |
| 2026-04-07 00:00 |
05:16:49.74 |
+34:41:38.0 |
HIP 24538 |
19.97 |
| 2026-04-07 12:00 |
05:16:51.39 |
+34:41:33.9 |
HIP 24538 |
20.12 |
| 2026-04-08 00:00 |
05:16:53.07 |
+34:41:29.8 |
HIP 24538 |
20.27 |
| 2026-04-08 12:00 |
05:16:54.78 |
+34:41:25.7 |
HIP 24538 |
20.43 |
| 2026-04-09 00:00 |
05:16:56.51 |
+34:41:21.8 |
HIP 24538 |
20.61 |
| 2026-04-09 12:00 |
05:16:58.27 |
+34:41:17.8 |
HIP 24538 |
20.79 |
| 2026-04-10 00:00 |
05:17:00.05 |
+34:41:14.0 |
HIP 24538 |
20.98 |
| 2026-04-10 12:00 |
05:17:01.86 |
+34:41:10.2 |
HIP 24538 |
21.18 |
| 2026-04-11 00:00 |
05:17:03.69 |
+34:41:06.4 |
HIP 24538 |
21.38 |
| 2026-04-11 12:00 |
05:17:05.55 |
+34:41:02.7 |
HIP 24538 |
21.60 |
| 2026-04-12 00:00 |
05:17:07.43 |
+34:40:59.1 |
HIP 24538 |
21.83 |
| 2026-04-12 12:00 |
05:17:09.33 |
+34:40:55.5 |
HIP 24538 |
22.06 |
| 2026-04-13 00:00 |
05:17:11.26 |
+34:40:52.0 |
HIP 24538 |
22.30 |
| 2026-04-13 12:00 |
05:17:13.21 |
+34:40:48.5 |
HIP 24538 |
22.56 |
| 2026-04-14 00:00 |
05:17:15.18 |
+34:40:45.2 |
HIP 24538 |
22.82 |
| 2026-04-14 12:00 |
05:17:17.18 |
+34:40:41.8 |
HIP 24538 |
23.09 |
| 2026-04-15 00:00 |
05:17:19.20 |
+34:40:38.6 |
HIP 24538 |
23.36 |
| 2026-04-15 12:00 |
05:17:21.25 |
+34:40:35.4 |
HIP 24538 |
23.65 |
| 2026-04-16 00:00 |
05:17:23.32 |
+34:40:32.2 |
HIP 24538 |
23.95 |