C/2016 A8 (LINEAR)
メタデータ
| 項目 |
値 |
| Designation |
C/2016 A8 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-08-30T16:04:12.187200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:22Z |
| Obs used |
1422 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
13.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-08-11.0000000 |
| e |
0.94634519 |
| q (au) |
1.881129 |
| a (au) |
35.059838 |
| i (deg) |
148.211836 |
| Ω (om, deg) |
111.232164 |
| ω (w, deg) |
130.265301 |
| M (ma, deg) |
359.906613 |
等級
散乱 + 全体線形
$$
M_a = (9.519 + 5.854\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.519 |
| n |
5.854 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.998 |
| 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 |
| 2014-08-24 |
2016-01-14 |
-32.9194 |
+16.795 |
| 2016-01-14 |
2016-08-30 |
+0.8342 |
-0.436 |
| 2016-08-30 |
2017-03-05 |
-3.2783 |
+0.896 |
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 |
11:40:36.19 |
-32:55:31.5 |
HIP 56880 |
23.08 |
| 2026-02-03 12:00 |
11:40:30.93 |
-32:55:38.1 |
HIP 56880 |
22.61 |
| 2026-02-04 00:00 |
11:40:25.63 |
-32:55:44.3 |
HIP 56880 |
22.18 |
| 2026-02-04 12:00 |
11:40:20.30 |
-32:55:49.9 |
HIP 56880 |
21.78 |
| 2026-02-05 00:00 |
11:40:14.93 |
-32:55:55.1 |
HIP 56880 |
21.43 |
| 2026-02-05 12:00 |
11:40:09.52 |
-32:55:59.8 |
HIP 56880 |
21.12 |
| 2026-02-06 00:00 |
11:40:04.08 |
-32:56:03.9 |
HIP 56880 |
20.85 |
| 2026-02-06 12:00 |
11:39:58.60 |
-32:56:07.6 |
HIP 56880 |
20.64 |
| 2026-02-07 00:00 |
11:39:53.09 |
-32:56:10.8 |
HIP 56880 |
20.48 |
| 2026-02-07 12:00 |
11:39:47.54 |
-32:56:13.4 |
HIP 56880 |
20.38 |
| 2026-02-08 00:00 |
11:39:41.96 |
-32:56:15.6 |
HIP 56880 |
20.33 |
| 2026-02-08 12:00 |
11:39:36.34 |
-32:56:17.2 |
HIP 56880 |
20.35 |
| 2026-02-09 00:00 |
11:39:30.69 |
-32:56:18.4 |
HIP 56880 |
20.42 |
| 2026-02-09 12:00 |
11:39:25.01 |
-32:56:19.0 |
HIP 56880 |
20.56 |
| 2026-02-10 00:00 |
11:39:19.29 |
-32:56:19.1 |
HIP 56880 |
20.76 |
| 2026-02-10 12:00 |
11:39:13.54 |
-32:56:18.7 |
HIP 56880 |
21.01 |
| 2026-02-11 00:00 |
11:39:07.76 |
-32:56:17.8 |
HIP 56880 |
21.33 |
| 2026-02-11 12:00 |
11:39:01.95 |
-32:56:16.4 |
HIP 56880 |
21.71 |
| 2026-02-12 00:00 |
11:38:56.11 |
-32:56:14.5 |
HIP 56880 |
22.14 |
| 2026-02-12 12:00 |
11:38:50.23 |
-32:56:12.0 |
HIP 56880 |
22.62 |
| 2026-02-13 00:00 |
11:38:44.33 |
-32:56:09.1 |
HIP 56657 |
21.85 |
| 2026-02-13 12:00 |
11:38:38.39 |
-32:56:05.6 |
HIP 56657 |
20.63 |
| 2026-02-14 00:00 |
11:38:32.43 |
-32:56:01.6 |
HIP 56657 |
19.41 |
| 2026-02-14 12:00 |
11:38:26.44 |
-32:55:57.1 |
HIP 56657 |
18.18 |
| 2026-02-15 00:00 |
11:38:20.42 |
-32:55:52.1 |
HIP 56657 |
16.96 |
| 2026-02-15 12:00 |
11:38:14.37 |
-32:55:46.5 |
HIP 56657 |
15.74 |
| 2026-02-16 00:00 |
11:38:08.30 |
-32:55:40.5 |
HIP 56657 |
14.52 |
| 2026-02-16 12:00 |
11:38:02.20 |
-32:55:33.9 |
HIP 56657 |
13.32 |
| 2026-02-17 00:00 |
11:37:56.07 |
-32:55:26.8 |
HIP 56657 |
12.13 |
| 2026-02-17 12:00 |
11:37:49.92 |
-32:55:19.1 |
HIP 56657 |
10.96 |
| 2026-02-18 00:00 |
11:37:43.74 |
-32:55:11.0 |
HIP 56657 |
9.81 |
| 2026-02-18 12:00 |
11:37:37.54 |
-32:55:02.3 |
HIP 56657 |
8.72 |
| 2026-02-19 00:00 |
11:37:31.31 |
-32:54:53.2 |
HIP 56657 |
7.69 |
| 2026-02-19 12:00 |
11:37:25.06 |
-32:54:43.5 |
HIP 56657 |
6.76 |
| 2026-02-20 00:00 |
11:37:18.79 |
-32:54:33.3 |
HIP 56657 |
5.99 |
| 2026-02-20 12:00 |
11:37:12.49 |
-32:54:22.5 |
HIP 56657 |
5.44 |
| 2026-02-21 00:00 |
11:37:06.18 |
-32:54:11.3 |
HIP 56657 |
5.20 |
| 2026-02-21 12:00 |
11:36:59.84 |
-32:53:59.5 |
HIP 56657 |
5.30 |
| 2026-02-22 00:00 |
11:36:53.48 |
-32:53:47.2 |
HIP 56657 |
5.73 |
| 2026-02-22 12:00 |
11:36:47.10 |
-32:53:34.4 |
HIP 56657 |
6.43 |
| 2026-02-23 00:00 |
11:36:40.70 |
-32:53:21.1 |
HIP 56657 |
7.33 |
| 2026-02-23 12:00 |
11:36:34.28 |
-32:53:07.3 |
HIP 56657 |
8.36 |
| 2026-02-24 00:00 |
11:36:27.85 |
-32:52:53.0 |
HIP 56657 |
9.49 |