メタデータ
| 項目 |
値 |
| Designation |
C/2000 D2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-03-08T14:43:54.082560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:04Z |
| Obs used |
79 |
| NEO |
- |
| M1 |
13.700 |
| 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) |
2000-03-01.0000000 |
| e |
0.86703438 |
| q (au) |
2.297610 |
| a (au) |
17.279730 |
| i (deg) |
156.991926 |
| Ω (om, deg) |
235.887153 |
| ω (w, deg) |
117.682679 |
| M (ma, deg) |
359.895528 |
等級
散乱 + 全体線形
$$
M_a = (18.087 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.087 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
20:59:20.76 |
-39:56:39.2 |
HIP 103662 |
14.14 |
| 2026-06-01 12:00 |
20:59:18.18 |
-39:57:06.7 |
HIP 103662 |
14.17 |
| 2026-06-02 00:00 |
20:59:15.56 |
-39:57:34.3 |
HIP 103662 |
14.24 |
| 2026-06-02 12:00 |
20:59:12.90 |
-39:58:01.9 |
HIP 103662 |
14.35 |
| 2026-06-03 00:00 |
20:59:10.21 |
-39:58:29.6 |
HIP 103662 |
14.49 |
| 2026-06-03 12:00 |
20:59:07.47 |
-39:58:57.2 |
HIP 103662 |
14.67 |
| 2026-06-04 00:00 |
20:59:04.70 |
-39:59:24.9 |
HIP 103662 |
14.89 |
| 2026-06-04 12:00 |
20:59:01.90 |
-39:59:52.6 |
HIP 103662 |
15.14 |
| 2026-06-05 00:00 |
20:58:59.06 |
-40:00:20.3 |
HIP 103662 |
15.43 |
| 2026-06-05 12:00 |
20:58:56.18 |
-40:00:48.1 |
HIP 103662 |
15.75 |
| 2026-06-06 00:00 |
20:58:53.26 |
-40:01:15.8 |
HIP 103662 |
16.10 |
| 2026-06-06 12:00 |
20:58:50.31 |
-40:01:43.6 |
HIP 103662 |
16.49 |
| 2026-06-07 00:00 |
20:58:47.32 |
-40:02:11.3 |
HIP 103662 |
16.90 |
| 2026-06-07 12:00 |
20:58:44.29 |
-40:02:39.1 |
HIP 103662 |
17.34 |
| 2026-06-08 00:00 |
20:58:41.23 |
-40:03:06.9 |
HIP 103662 |
17.81 |
| 2026-06-08 12:00 |
20:58:38.14 |
-40:03:34.6 |
HIP 103662 |
18.30 |
| 2026-06-09 00:00 |
20:58:35.00 |
-40:04:02.4 |
HIP 103662 |
18.82 |
| 2026-06-09 12:00 |
20:58:31.84 |
-40:04:30.2 |
HIP 103662 |
19.36 |
| 2026-06-10 00:00 |
20:58:28.63 |
-40:04:58.0 |
HIP 103662 |
19.92 |
| 2026-06-10 12:00 |
20:58:25.39 |
-40:05:25.7 |
HIP 103662 |
20.50 |
| 2026-06-11 00:00 |
20:58:22.12 |
-40:05:53.5 |
HIP 103662 |
21.10 |
| 2026-06-11 12:00 |
20:58:18.81 |
-40:06:21.2 |
HIP 103662 |
21.72 |
| 2026-06-12 00:00 |
20:58:15.47 |
-40:06:48.9 |
HIP 103662 |
22.35 |
| 2026-06-12 12:00 |
20:58:12.10 |
-40:07:16.6 |
HIP 103662 |
23.00 |
| 2026-06-13 00:00 |
20:58:08.68 |
-40:07:44.3 |
HIP 103662 |
23.67 |
| 2026-06-13 12:00 |
20:58:05.24 |
-40:08:12.0 |
HIP 103662 |
24.34 |
| 2026-06-14 00:00 |
20:58:01.76 |
-40:08:39.6 |
HIP 103662 |
25.04 |
| 2026-06-14 12:00 |
20:57:58.25 |
-40:09:07.3 |
HIP 103662 |
25.74 |
| 2026-06-15 00:00 |
20:57:54.70 |
-40:09:34.8 |
HIP 103662 |
26.46 |
| 2026-06-15 12:00 |
20:57:51.13 |
-40:10:02.4 |
HIP 103286 |
27.09 |
| 2026-06-16 00:00 |
20:57:47.51 |
-40:10:29.9 |
HIP 103286 |
26.35 |
| 2026-06-16 12:00 |
20:57:43.87 |
-40:10:57.4 |
HIP 103286 |
25.61 |
| 2026-06-17 00:00 |
20:57:40.20 |
-40:11:24.9 |
HIP 103286 |
24.88 |
| 2026-06-17 12:00 |
20:57:36.49 |
-40:11:52.3 |
HIP 103286 |
24.14 |
| 2026-06-18 00:00 |
20:57:32.75 |
-40:12:19.7 |
HIP 103286 |
23.41 |
| 2026-06-18 12:00 |
20:57:28.98 |
-40:12:47.0 |
HIP 103286 |
22.67 |
| 2026-06-19 00:00 |
20:57:25.17 |
-40:13:14.3 |
HIP 103286 |
21.95 |
| 2026-06-19 12:00 |
20:57:21.34 |
-40:13:41.5 |
HIP 103286 |
21.22 |
| 2026-06-20 00:00 |
20:57:17.48 |
-40:14:08.6 |
HIP 103286 |
20.50 |
| 2026-06-20 12:00 |
20:57:13.58 |
-40:14:35.8 |
HIP 103286 |
19.78 |
| 2026-06-21 00:00 |
20:57:09.66 |
-40:15:02.8 |
HIP 103286 |
19.08 |
| 2026-06-21 12:00 |
20:57:05.71 |
-40:15:29.8 |
HIP 103286 |
18.38 |
| 2026-06-22 00:00 |
20:57:01.72 |
-40:15:56.8 |
HIP 103286 |
17.69 |