C/1999 K8 (LINEAR)
メタデータ
| 項目 |
値 |
| Designation |
C/1999 K8 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-04-24T06:58:48.679680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
610 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
5.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2000-03-20.0000000 |
| e |
1.00071246 |
| q (au) |
4.200554 |
| a (au) |
-5895.868027 |
| i (deg) |
52.733975 |
| Ω (om, deg) |
195.394218 |
| ω (w, deg) |
164.619681 |
| M (ma, deg) |
-0.000077 |
等級
散乱 + 全体線形
$$
M_a = (5.474 + 3.588\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.474 |
| n |
3.588 |
| gf |
0.999 |
| gb |
-0.502 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1998-08-19 |
2000-02-01 |
+9.8022 |
-7.106 |
| 2000-05-28 |
2001-01-30 |
-20.8860 |
+13.194 |
| 2001-01-30 |
2001-11-01 |
+24.1080 |
-17.483 |
| 2001-11-01 |
2003-03-07 |
-11.6096 |
+10.480 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
09:42:08.75 |
-27:44:34.0 |
HIP 47500 |
15.84 |
| 2026-02-03 12:00 |
09:42:06.10 |
-27:44:27.9 |
HIP 47500 |
15.35 |
| 2026-02-04 00:00 |
09:42:03.44 |
-27:44:21.5 |
HIP 47500 |
14.87 |
| 2026-02-04 12:00 |
09:42:00.78 |
-27:44:14.9 |
HIP 47500 |
14.40 |
| 2026-02-05 00:00 |
09:41:58.11 |
-27:44:08.1 |
HIP 47500 |
13.94 |
| 2026-02-05 12:00 |
09:41:55.44 |
-27:44:01.0 |
HIP 47500 |
13.49 |
| 2026-02-06 00:00 |
09:41:52.77 |
-27:43:53.7 |
HIP 47500 |
13.06 |
| 2026-02-06 12:00 |
09:41:50.10 |
-27:43:46.1 |
HIP 47500 |
12.65 |
| 2026-02-07 00:00 |
09:41:47.42 |
-27:43:38.3 |
HIP 47500 |
12.25 |
| 2026-02-07 12:00 |
09:41:44.74 |
-27:43:30.2 |
HIP 47500 |
11.87 |
| 2026-02-08 00:00 |
09:41:42.06 |
-27:43:21.9 |
HIP 47500 |
11.51 |
| 2026-02-08 12:00 |
09:41:39.38 |
-27:43:13.4 |
HIP 47500 |
11.18 |
| 2026-02-09 00:00 |
09:41:36.69 |
-27:43:04.6 |
HIP 47500 |
10.88 |
| 2026-02-09 12:00 |
09:41:34.00 |
-27:42:55.6 |
HIP 47500 |
10.60 |
| 2026-02-10 00:00 |
09:41:31.32 |
-27:42:46.3 |
HIP 47500 |
10.36 |
| 2026-02-10 12:00 |
09:41:28.63 |
-27:42:36.8 |
HIP 47500 |
10.15 |
| 2026-02-11 00:00 |
09:41:25.94 |
-27:42:27.0 |
HIP 47500 |
9.98 |
| 2026-02-11 12:00 |
09:41:23.25 |
-27:42:17.0 |
HIP 47500 |
9.85 |
| 2026-02-12 00:00 |
09:41:20.56 |
-27:42:06.8 |
HIP 47500 |
9.75 |
| 2026-02-12 12:00 |
09:41:17.87 |
-27:41:56.3 |
HIP 47500 |
9.71 |
| 2026-02-13 00:00 |
09:41:15.18 |
-27:41:45.6 |
HIP 47500 |
9.70 |
| 2026-02-13 12:00 |
09:41:12.49 |
-27:41:34.6 |
HIP 47500 |
9.74 |
| 2026-02-14 00:00 |
09:41:09.80 |
-27:41:23.4 |
HIP 47500 |
9.82 |
| 2026-02-14 12:00 |
09:41:07.11 |
-27:41:12.0 |
HIP 47500 |
9.94 |
| 2026-02-15 00:00 |
09:41:04.42 |
-27:41:00.4 |
HIP 47500 |
10.11 |
| 2026-02-15 12:00 |
09:41:01.74 |
-27:40:48.5 |
HIP 47500 |
10.31 |
| 2026-02-16 00:00 |
09:40:59.05 |
-27:40:36.4 |
HIP 47500 |
10.55 |
| 2026-02-16 12:00 |
09:40:56.37 |
-27:40:24.0 |
HIP 47500 |
10.83 |
| 2026-02-17 00:00 |
09:40:53.69 |
-27:40:11.4 |
HIP 47500 |
11.14 |
| 2026-02-17 12:00 |
09:40:51.01 |
-27:39:58.6 |
HIP 47500 |
11.48 |
| 2026-02-18 00:00 |
09:40:48.34 |
-27:39:45.6 |
HIP 47500 |
11.84 |
| 2026-02-18 12:00 |
09:40:45.67 |
-27:39:32.3 |
HIP 47500 |
12.23 |
| 2026-02-19 00:00 |
09:40:43.00 |
-27:39:18.8 |
HIP 47500 |
12.64 |
| 2026-02-19 12:00 |
09:40:40.33 |
-27:39:05.1 |
HIP 47500 |
13.08 |
| 2026-02-20 00:00 |
09:40:37.67 |
-27:38:51.2 |
HIP 47500 |
13.53 |
| 2026-02-20 12:00 |
09:40:35.01 |
-27:38:37.0 |
HIP 47500 |
14.00 |
| 2026-02-21 00:00 |
09:40:32.36 |
-27:38:22.6 |
HIP 47500 |
14.48 |
| 2026-02-21 12:00 |
09:40:29.71 |
-27:38:08.0 |
HIP 47500 |
14.98 |
| 2026-02-22 00:00 |
09:40:27.07 |
-27:37:53.2 |
HIP 47500 |
15.49 |
| 2026-02-22 12:00 |
09:40:24.43 |
-27:37:38.2 |
HIP 47500 |
16.02 |
| 2026-02-23 00:00 |
09:40:21.79 |
-27:37:22.9 |
HIP 47500 |
16.55 |
| 2026-02-23 12:00 |
09:40:19.16 |
-27:37:07.5 |
HIP 47500 |
17.09 |
| 2026-02-24 00:00 |
09:40:16.54 |
-27:36:51.8 |
HIP 47500 |
17.64 |