メタデータ
| 項目 |
値 |
| Designation |
C/1998 Y1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-11-21T13:57:33.661440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
131 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1999-01-13.0000000 |
| e |
0.92389938 |
| q (au) |
1.746990 |
| a (au) |
22.956311 |
| i (deg) |
28.108156 |
| Ω (om, deg) |
98.858723 |
| ω (w, deg) |
339.843627 |
| M (ma, deg) |
0.469715 |
等級
散乱 + 全体線形
$$
M_a = (13.174 + 5.449\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.174 |
| n |
5.449 |
| gf |
0.913 |
| gb |
-0.901 |
| k |
1.000 |
| δ90 |
6.054 |
| 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 |
16:48:58.81 |
-08:03:06.9 |
HIP 82156 |
31.72 |
| 2026-05-12 12:00 |
16:48:55.93 |
-08:02:58.1 |
HIP 82156 |
31.02 |
| 2026-05-13 00:00 |
16:48:53.05 |
-08:02:49.4 |
HIP 82156 |
30.31 |
| 2026-05-13 12:00 |
16:48:50.15 |
-08:02:40.8 |
HIP 82156 |
29.60 |
| 2026-05-14 00:00 |
16:48:47.25 |
-08:02:32.3 |
HIP 82156 |
28.89 |
| 2026-05-14 12:00 |
16:48:44.33 |
-08:02:23.8 |
HIP 82156 |
28.18 |
| 2026-05-15 00:00 |
16:48:41.40 |
-08:02:15.4 |
HIP 82156 |
27.47 |
| 2026-05-15 12:00 |
16:48:38.47 |
-08:02:07.1 |
HIP 82156 |
26.77 |
| 2026-05-16 00:00 |
16:48:35.52 |
-08:01:58.9 |
HIP 82156 |
26.06 |
| 2026-05-16 12:00 |
16:48:32.57 |
-08:01:50.8 |
HIP 82156 |
25.35 |
| 2026-05-17 00:00 |
16:48:29.60 |
-08:01:42.7 |
HIP 82156 |
24.64 |
| 2026-05-17 12:00 |
16:48:26.63 |
-08:01:34.7 |
HIP 82156 |
23.93 |
| 2026-05-18 00:00 |
16:48:23.65 |
-08:01:26.8 |
HIP 82156 |
23.23 |
| 2026-05-18 12:00 |
16:48:20.66 |
-08:01:19.0 |
HIP 82156 |
22.53 |
| 2026-05-19 00:00 |
16:48:17.66 |
-08:01:11.3 |
HIP 82156 |
21.83 |
| 2026-05-19 12:00 |
16:48:14.65 |
-08:01:03.7 |
HIP 82156 |
21.13 |
| 2026-05-20 00:00 |
16:48:11.64 |
-08:00:56.1 |
HIP 82156 |
20.43 |
| 2026-05-20 12:00 |
16:48:08.62 |
-08:00:48.6 |
HIP 82156 |
19.74 |
| 2026-05-21 00:00 |
16:48:05.59 |
-08:00:41.2 |
HIP 82156 |
19.06 |
| 2026-05-21 12:00 |
16:48:02.56 |
-08:00:34.0 |
HIP 82156 |
18.38 |
| 2026-05-22 00:00 |
16:47:59.52 |
-08:00:26.7 |
HIP 82156 |
17.70 |
| 2026-05-22 12:00 |
16:47:56.47 |
-08:00:19.6 |
HIP 82156 |
17.04 |
| 2026-05-23 00:00 |
16:47:53.42 |
-08:00:12.6 |
HIP 82156 |
16.38 |
| 2026-05-23 12:00 |
16:47:50.36 |
-08:00:05.7 |
HIP 82156 |
15.73 |
| 2026-05-24 00:00 |
16:47:47.30 |
-07:59:58.8 |
HIP 82156 |
15.09 |
| 2026-05-24 12:00 |
16:47:44.23 |
-07:59:52.1 |
HIP 82156 |
14.46 |
| 2026-05-25 00:00 |
16:47:41.16 |
-07:59:45.4 |
HIP 82156 |
13.85 |
| 2026-05-25 12:00 |
16:47:38.08 |
-07:59:38.8 |
HIP 82156 |
13.26 |
| 2026-05-26 00:00 |
16:47:35.00 |
-07:59:32.3 |
HIP 82156 |
12.68 |
| 2026-05-26 12:00 |
16:47:31.91 |
-07:59:26.0 |
HIP 82156 |
12.13 |
| 2026-05-27 00:00 |
16:47:28.82 |
-07:59:19.7 |
HIP 82156 |
11.60 |
| 2026-05-27 12:00 |
16:47:25.73 |
-07:59:13.5 |
HIP 82156 |
11.10 |
| 2026-05-28 00:00 |
16:47:22.63 |
-07:59:07.4 |
HIP 82156 |
10.64 |
| 2026-05-28 12:00 |
16:47:19.53 |
-07:59:01.4 |
HIP 82156 |
10.21 |
| 2026-05-29 00:00 |
16:47:16.42 |
-07:58:55.4 |
HIP 82156 |
9.83 |
| 2026-05-29 12:00 |
16:47:13.32 |
-07:58:49.6 |
HIP 82156 |
9.50 |
| 2026-05-30 00:00 |
16:47:10.21 |
-07:58:43.9 |
HIP 82156 |
9.22 |
| 2026-05-30 12:00 |
16:47:07.10 |
-07:58:38.3 |
HIP 82156 |
9.01 |
| 2026-05-31 00:00 |
16:47:03.98 |
-07:58:32.7 |
HIP 82156 |
8.86 |
| 2026-05-31 12:00 |
16:47:00.87 |
-07:58:27.3 |
HIP 82156 |
8.77 |
| 2026-06-01 00:00 |
16:46:57.75 |
-07:58:22.0 |
HIP 82156 |
8.76 |
| 2026-06-01 12:00 |
16:46:54.63 |
-07:58:16.7 |
HIP 82156 |
8.81 |
| 2026-06-02 00:00 |
16:46:51.52 |
-07:58:11.6 |
HIP 82156 |
8.94 |