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 |
1.000 |
| gb |
-0.500 |
| 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 |
2001-08-18 |
+4.3226 |
-3.002 |
| 2001-08-18 |
2003-03-07 |
-5.0352 |
+4.588 |
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) |
| 2026-06-01 00:00 |
09:36:51.37 |
-26:16:47.3 |
HIP 47125 |
21.17 |
| 2026-06-01 12:00 |
09:36:52.39 |
-26:16:25.9 |
HIP 47125 |
20.95 |
| 2026-06-02 00:00 |
09:36:53.44 |
-26:16:04.8 |
HIP 47125 |
20.75 |
| 2026-06-02 12:00 |
09:36:54.51 |
-26:15:43.7 |
HIP 47125 |
20.55 |
| 2026-06-03 00:00 |
09:36:55.60 |
-26:15:22.9 |
HIP 47125 |
20.37 |
| 2026-06-03 12:00 |
09:36:56.71 |
-26:15:02.2 |
HIP 47125 |
20.20 |
| 2026-06-04 00:00 |
09:36:57.84 |
-26:14:41.6 |
HIP 47125 |
20.04 |
| 2026-06-04 12:00 |
09:36:58.99 |
-26:14:21.2 |
HIP 47125 |
19.89 |
| 2026-06-05 00:00 |
09:37:00.16 |
-26:14:00.9 |
HIP 47125 |
19.76 |
| 2026-06-05 12:00 |
09:37:01.35 |
-26:13:40.9 |
HIP 47125 |
19.64 |
| 2026-06-06 00:00 |
09:37:02.57 |
-26:13:20.9 |
HIP 47125 |
19.53 |
| 2026-06-06 12:00 |
09:37:03.80 |
-26:13:01.2 |
HIP 47125 |
19.44 |
| 2026-06-07 00:00 |
09:37:05.05 |
-26:12:41.6 |
HIP 47125 |
19.36 |
| 2026-06-07 12:00 |
09:37:06.33 |
-26:12:22.1 |
HIP 47125 |
19.29 |
| 2026-06-08 00:00 |
09:37:07.62 |
-26:12:02.8 |
HIP 47125 |
19.25 |
| 2026-06-08 12:00 |
09:37:08.94 |
-26:11:43.7 |
HIP 47125 |
19.21 |
| 2026-06-09 00:00 |
09:37:10.27 |
-26:11:24.8 |
HIP 47125 |
19.19 |
| 2026-06-09 12:00 |
09:37:11.63 |
-26:11:06.0 |
HIP 47125 |
19.19 |
| 2026-06-10 00:00 |
09:37:13.00 |
-26:10:47.4 |
HIP 47125 |
19.20 |
| 2026-06-10 12:00 |
09:37:14.40 |
-26:10:29.0 |
HIP 47125 |
19.22 |
| 2026-06-11 00:00 |
09:37:15.81 |
-26:10:10.7 |
HIP 47125 |
19.26 |
| 2026-06-11 12:00 |
09:37:17.24 |
-26:09:52.6 |
HIP 47125 |
19.32 |
| 2026-06-12 00:00 |
09:37:18.70 |
-26:09:34.7 |
HIP 47125 |
19.39 |
| 2026-06-12 12:00 |
09:37:20.17 |
-26:09:17.0 |
HIP 47125 |
19.47 |
| 2026-06-13 00:00 |
09:37:21.66 |
-26:08:59.4 |
HIP 47125 |
19.58 |
| 2026-06-13 12:00 |
09:37:23.17 |
-26:08:42.1 |
HIP 47125 |
19.69 |
| 2026-06-14 00:00 |
09:37:24.70 |
-26:08:24.9 |
HIP 47125 |
19.82 |
| 2026-06-14 12:00 |
09:37:26.25 |
-26:08:07.8 |
HIP 47125 |
19.97 |
| 2026-06-15 00:00 |
09:37:27.82 |
-26:07:51.0 |
HIP 47125 |
20.13 |
| 2026-06-15 12:00 |
09:37:29.41 |
-26:07:34.4 |
HIP 47125 |
20.30 |
| 2026-06-16 00:00 |
09:37:31.01 |
-26:07:17.9 |
HIP 47125 |
20.49 |
| 2026-06-16 12:00 |
09:37:32.64 |
-26:07:01.6 |
HIP 47125 |
20.69 |
| 2026-06-17 00:00 |
09:37:34.28 |
-26:06:45.5 |
HIP 47125 |
20.90 |
| 2026-06-17 12:00 |
09:37:35.94 |
-26:06:29.6 |
HIP 47125 |
21.12 |
| 2026-06-18 00:00 |
09:37:37.62 |
-26:06:13.9 |
HIP 47125 |
21.36 |
| 2026-06-18 12:00 |
09:37:39.31 |
-26:05:58.4 |
HIP 47125 |
21.61 |
| 2026-06-19 00:00 |
09:37:41.03 |
-26:05:43.0 |
HIP 47125 |
21.88 |
| 2026-06-19 12:00 |
09:37:42.76 |
-26:05:27.9 |
HIP 47125 |
22.15 |
| 2026-06-20 00:00 |
09:37:44.51 |
-26:05:12.9 |
HIP 47125 |
22.43 |
| 2026-06-20 12:00 |
09:37:46.28 |
-26:04:58.1 |
HIP 47125 |
22.73 |
| 2026-06-21 00:00 |
09:37:48.06 |
-26:04:43.6 |
HIP 47125 |
23.03 |
| 2026-06-21 12:00 |
09:37:49.86 |
-26:04:29.2 |
HIP 47125 |
23.35 |
| 2026-06-22 00:00 |
09:37:51.68 |
-26:04:15.0 |
HIP 47125 |
23.68 |