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 |
0.980 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.996 |
| 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 |
03:42:27.79 |
-31:57:35.5 |
HIP 17304 |
3.02 |
| 2026-05-12 12:00 |
03:42:30.55 |
-31:57:28.5 |
HIP 17304 |
3.52 |
| 2026-05-13 00:00 |
03:42:33.32 |
-31:57:21.9 |
HIP 17304 |
4.05 |
| 2026-05-13 12:00 |
03:42:36.08 |
-31:57:15.4 |
HIP 17304 |
4.59 |
| 2026-05-14 00:00 |
03:42:38.85 |
-31:57:09.2 |
HIP 17304 |
5.15 |
| 2026-05-14 12:00 |
03:42:41.62 |
-31:57:03.3 |
HIP 17304 |
5.72 |
| 2026-05-15 00:00 |
03:42:44.40 |
-31:56:57.6 |
HIP 17304 |
6.29 |
| 2026-05-15 12:00 |
03:42:47.17 |
-31:56:52.1 |
HIP 17304 |
6.87 |
| 2026-05-16 00:00 |
03:42:49.95 |
-31:56:46.9 |
HIP 17304 |
7.45 |
| 2026-05-16 12:00 |
03:42:52.73 |
-31:56:41.9 |
HIP 17304 |
8.04 |
| 2026-05-17 00:00 |
03:42:55.51 |
-31:56:37.2 |
HIP 17304 |
8.62 |
| 2026-05-17 12:00 |
03:42:58.29 |
-31:56:32.7 |
HIP 17304 |
9.21 |
| 2026-05-18 00:00 |
03:43:01.07 |
-31:56:28.4 |
HIP 17304 |
9.80 |
| 2026-05-18 12:00 |
03:43:03.85 |
-31:56:24.5 |
HIP 17304 |
10.39 |
| 2026-05-19 00:00 |
03:43:06.63 |
-31:56:20.7 |
HIP 17304 |
10.97 |
| 2026-05-19 12:00 |
03:43:09.41 |
-31:56:17.2 |
HIP 17304 |
11.56 |
| 2026-05-20 00:00 |
03:43:12.19 |
-31:56:14.0 |
HIP 17304 |
12.16 |
| 2026-05-20 12:00 |
03:43:14.97 |
-31:56:11.0 |
HIP 17304 |
12.75 |
| 2026-05-21 00:00 |
03:43:17.75 |
-31:56:08.2 |
HIP 17304 |
13.34 |
| 2026-05-21 12:00 |
03:43:20.53 |
-31:56:05.7 |
HIP 17304 |
13.93 |
| 2026-05-22 00:00 |
03:43:23.31 |
-31:56:03.4 |
HIP 17304 |
14.52 |
| 2026-05-22 12:00 |
03:43:26.09 |
-31:56:01.4 |
HIP 17304 |
15.11 |
| 2026-05-23 00:00 |
03:43:28.86 |
-31:55:59.7 |
HIP 17304 |
15.69 |
| 2026-05-23 12:00 |
03:43:31.63 |
-31:55:58.1 |
HIP 17304 |
16.28 |
| 2026-05-24 00:00 |
03:43:34.41 |
-31:55:56.9 |
HIP 17304 |
16.87 |
| 2026-05-24 12:00 |
03:43:37.18 |
-31:55:55.9 |
HIP 17304 |
17.46 |
| 2026-05-25 00:00 |
03:43:39.94 |
-31:55:55.1 |
HIP 17304 |
18.05 |
| 2026-05-25 12:00 |
03:43:42.71 |
-31:55:54.6 |
HIP 17304 |
18.63 |
| 2026-05-26 00:00 |
03:43:45.47 |
-31:55:54.3 |
HIP 17304 |
19.22 |
| 2026-05-26 12:00 |
03:43:48.23 |
-31:55:54.3 |
HIP 17304 |
19.81 |
| 2026-05-27 00:00 |
03:43:50.99 |
-31:55:54.5 |
HIP 17304 |
20.39 |
| 2026-05-27 12:00 |
03:43:53.74 |
-31:55:55.0 |
HIP 17304 |
20.97 |
| 2026-05-28 00:00 |
03:43:56.49 |
-31:55:55.7 |
HIP 17304 |
21.56 |
| 2026-05-28 12:00 |
03:43:59.24 |
-31:55:56.6 |
HIP 17304 |
22.14 |
| 2026-05-29 00:00 |
03:44:01.98 |
-31:55:57.8 |
HIP 17304 |
22.72 |
| 2026-05-29 12:00 |
03:44:04.72 |
-31:55:59.3 |
HIP 17509 |
22.93 |
| 2026-05-30 00:00 |
03:44:07.46 |
-31:56:01.0 |
HIP 17509 |
22.68 |
| 2026-05-30 12:00 |
03:44:10.19 |
-31:56:03.0 |
HIP 17509 |
22.44 |
| 2026-05-31 00:00 |
03:44:12.92 |
-31:56:05.2 |
HIP 17509 |
22.21 |
| 2026-05-31 12:00 |
03:44:15.64 |
-31:56:07.6 |
HIP 17509 |
22.01 |
| 2026-06-01 00:00 |
03:44:18.36 |
-31:56:10.3 |
HIP 17509 |
21.82 |
| 2026-06-01 12:00 |
03:44:21.08 |
-31:56:13.3 |
HIP 17509 |
21.64 |
| 2026-06-02 00:00 |
03:44:23.78 |
-31:56:16.5 |
HIP 17509 |
21.49 |