メタデータ
| 項目 |
値 |
| Designation |
C/1999 J4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-11-17T10:01:47.156160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
40 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1999-05-20.0000000 |
| e |
0.99971322 |
| q (au) |
3.781074 |
| a (au) |
13184.435879 |
| i (deg) |
118.909155 |
| Ω (om, deg) |
264.479748 |
| ω (w, deg) |
95.116153 |
| M (ma, deg) |
359.999882 |
等級
散乱 + 全体線形
$$
M_a = (5.599 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.599 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
03:48:16.56 |
-32:27:23.2 |
HIP 17630 |
25.15 |
| 2026-07-29 12:00 |
03:48:17.60 |
-32:27:50.7 |
HIP 17630 |
25.60 |
| 2026-07-30 00:00 |
03:48:18.62 |
-32:28:18.3 |
HIP 17630 |
26.05 |
| 2026-07-30 12:00 |
03:48:19.62 |
-32:28:46.1 |
HIP 17630 |
26.49 |
| 2026-07-31 00:00 |
03:48:20.59 |
-32:29:14.0 |
HIP 17630 |
26.94 |
| 2026-07-31 12:00 |
03:48:21.54 |
-32:29:42.0 |
HIP 17951 |
27.34 |
| 2026-08-01 00:00 |
03:48:22.47 |
-32:30:10.2 |
HIP 17951 |
27.39 |
| 2026-08-01 12:00 |
03:48:23.38 |
-32:30:38.5 |
HIP 17951 |
27.45 |
| 2026-08-02 00:00 |
03:48:24.26 |
-32:31:06.9 |
HIP 17951 |
27.52 |
| 2026-08-02 12:00 |
03:48:25.12 |
-32:31:35.5 |
HIP 17951 |
27.61 |
| 2026-08-03 00:00 |
03:48:25.96 |
-32:32:04.2 |
HIP 17951 |
27.72 |
| 2026-08-03 12:00 |
03:48:26.77 |
-32:32:33.0 |
HIP 17951 |
27.83 |
| 2026-08-04 00:00 |
03:48:27.57 |
-32:33:01.9 |
HIP 17951 |
27.97 |
| 2026-08-04 12:00 |
03:48:28.33 |
-32:33:31.0 |
HIP 17951 |
28.11 |
| 2026-08-05 00:00 |
03:48:29.08 |
-32:34:00.2 |
HIP 17951 |
28.27 |
| 2026-08-05 12:00 |
03:48:29.80 |
-32:34:29.5 |
HIP 17951 |
28.44 |
| 2026-08-06 00:00 |
03:48:30.50 |
-32:34:58.9 |
HIP 17879 |
28.46 |
| 2026-08-06 12:00 |
03:48:31.18 |
-32:35:28.5 |
HIP 17879 |
27.95 |
| 2026-08-07 00:00 |
03:48:31.83 |
-32:35:58.1 |
HIP 17879 |
27.45 |
| 2026-08-07 12:00 |
03:48:32.46 |
-32:36:27.9 |
HIP 17879 |
26.95 |
| 2026-08-08 00:00 |
03:48:33.07 |
-32:36:57.8 |
HIP 17879 |
26.44 |
| 2026-08-08 12:00 |
03:48:33.65 |
-32:37:27.8 |
HIP 17879 |
25.94 |
| 2026-08-09 00:00 |
03:48:34.21 |
-32:37:57.9 |
HIP 17879 |
25.44 |
| 2026-08-09 12:00 |
03:48:34.74 |
-32:38:28.1 |
HIP 17879 |
24.94 |
| 2026-08-10 00:00 |
03:48:35.25 |
-32:38:58.4 |
HIP 17879 |
24.44 |
| 2026-08-10 12:00 |
03:48:35.74 |
-32:39:28.8 |
HIP 17879 |
23.95 |
| 2026-08-11 00:00 |
03:48:36.20 |
-32:39:59.3 |
HIP 17879 |
23.45 |
| 2026-08-11 12:00 |
03:48:36.64 |
-32:40:29.9 |
HIP 17879 |
22.96 |
| 2026-08-12 00:00 |
03:48:37.05 |
-32:41:00.6 |
HIP 17879 |
22.47 |
| 2026-08-12 12:00 |
03:48:37.44 |
-32:41:31.4 |
HIP 17879 |
21.98 |
| 2026-08-13 00:00 |
03:48:37.80 |
-32:42:02.3 |
HIP 17879 |
21.49 |
| 2026-08-13 12:00 |
03:48:38.14 |
-32:42:33.3 |
HIP 17879 |
21.01 |
| 2026-08-14 00:00 |
03:48:38.46 |
-32:43:04.3 |
HIP 17879 |
20.53 |
| 2026-08-14 12:00 |
03:48:38.75 |
-32:43:35.5 |
HIP 17879 |
20.06 |
| 2026-08-15 00:00 |
03:48:39.01 |
-32:44:06.7 |
HIP 17879 |
19.59 |
| 2026-08-15 12:00 |
03:48:39.26 |
-32:44:38.0 |
HIP 17879 |
19.12 |
| 2026-08-16 00:00 |
03:48:39.47 |
-32:45:09.4 |
HIP 17879 |
18.66 |
| 2026-08-16 12:00 |
03:48:39.67 |
-32:45:40.8 |
HIP 17879 |
18.20 |
| 2026-08-17 00:00 |
03:48:39.83 |
-32:46:12.4 |
HIP 17879 |
17.75 |
| 2026-08-17 12:00 |
03:48:39.98 |
-32:46:44.0 |
HIP 17879 |
17.31 |
| 2026-08-18 00:00 |
03:48:40.09 |
-32:47:15.6 |
HIP 17879 |
16.87 |
| 2026-08-18 12:00 |
03:48:40.19 |
-32:47:47.3 |
HIP 17879 |
16.44 |
| 2026-08-19 00:00 |
03:48:40.26 |
-32:48:19.1 |
HIP 17879 |
16.02 |