メタデータ
| 項目 |
値 |
| Designation |
C/2012 X1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-02-21T15:12:12.525120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:29Z |
| Obs used |
2560 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
14.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-12-18.0000000 |
| e |
0.98957208 |
| q (au) |
1.598910 |
| a (au) |
153.329748 |
| i (deg) |
44.367326 |
| Ω (om, deg) |
113.146428 |
| ω (w, deg) |
132.113677 |
| M (ma, deg) |
359.965929 |
等級
散乱 + 全体線形
$$
M_a = (7.004 + 5.465\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.004 |
| n |
5.465 |
| gf |
1.000 |
| gb |
-0.669 |
| k |
0.933 |
| 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 |
| 2012-12-08 |
2013-11-20 |
+5.9231 |
-3.732 |
| 2013-11-20 |
2014-02-20 |
+6.3519 |
-2.844 |
| 2014-02-22 |
2015-12-09 |
+1.6210 |
-2.089 |
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) |
| 2026-07-29 00:00 |
03:47:06.38 |
-23:22:02.1 |
HIP 17651 |
7.96 |
| 2026-07-29 12:00 |
03:47:08.29 |
-23:22:35.4 |
HIP 17651 |
8.65 |
| 2026-07-30 00:00 |
03:47:10.16 |
-23:23:09.0 |
HIP 17651 |
9.34 |
| 2026-07-30 12:00 |
03:47:12.00 |
-23:23:42.7 |
HIP 17651 |
10.04 |
| 2026-07-31 00:00 |
03:47:13.81 |
-23:24:16.8 |
HIP 17651 |
10.74 |
| 2026-07-31 12:00 |
03:47:15.59 |
-23:24:51.0 |
HIP 17651 |
11.43 |
| 2026-08-01 00:00 |
03:47:17.33 |
-23:25:25.4 |
HIP 17651 |
12.13 |
| 2026-08-01 12:00 |
03:47:19.03 |
-23:26:00.1 |
HIP 17651 |
12.83 |
| 2026-08-02 00:00 |
03:47:20.71 |
-23:26:34.9 |
HIP 17651 |
13.52 |
| 2026-08-02 12:00 |
03:47:22.34 |
-23:27:10.0 |
HIP 17651 |
14.22 |
| 2026-08-03 00:00 |
03:47:23.95 |
-23:27:45.3 |
HIP 17651 |
14.91 |
| 2026-08-03 12:00 |
03:47:25.52 |
-23:28:20.8 |
HIP 17651 |
15.60 |
| 2026-08-04 00:00 |
03:47:27.05 |
-23:28:56.4 |
HIP 17651 |
16.29 |
| 2026-08-04 12:00 |
03:47:28.55 |
-23:29:32.3 |
HIP 17651 |
16.98 |
| 2026-08-05 00:00 |
03:47:30.02 |
-23:30:08.4 |
HIP 17651 |
17.67 |
| 2026-08-05 12:00 |
03:47:31.45 |
-23:30:44.7 |
HIP 17651 |
18.36 |
| 2026-08-06 00:00 |
03:47:32.85 |
-23:31:21.2 |
HIP 17651 |
19.05 |
| 2026-08-06 12:00 |
03:47:34.21 |
-23:31:57.8 |
HIP 17651 |
19.73 |
| 2026-08-07 00:00 |
03:47:35.53 |
-23:32:34.7 |
HIP 17717 |
19.93 |
| 2026-08-07 12:00 |
03:47:36.82 |
-23:33:11.7 |
HIP 17717 |
19.30 |
| 2026-08-08 00:00 |
03:47:38.07 |
-23:33:49.0 |
HIP 17717 |
18.68 |
| 2026-08-08 12:00 |
03:47:39.29 |
-23:34:26.4 |
HIP 17717 |
18.05 |
| 2026-08-09 00:00 |
03:47:40.47 |
-23:35:03.9 |
HIP 17717 |
17.42 |
| 2026-08-09 12:00 |
03:47:41.62 |
-23:35:41.7 |
HIP 17717 |
16.80 |
| 2026-08-10 00:00 |
03:47:42.73 |
-23:36:19.6 |
HIP 17717 |
16.18 |
| 2026-08-10 12:00 |
03:47:43.80 |
-23:36:57.8 |
HIP 17717 |
15.55 |
| 2026-08-11 00:00 |
03:47:44.84 |
-23:37:36.0 |
HIP 17717 |
14.94 |
| 2026-08-11 12:00 |
03:47:45.84 |
-23:38:14.5 |
HIP 17717 |
14.32 |
| 2026-08-12 00:00 |
03:47:46.80 |
-23:38:53.1 |
HIP 17717 |
13.70 |
| 2026-08-12 12:00 |
03:47:47.73 |
-23:39:31.8 |
HIP 17717 |
13.09 |
| 2026-08-13 00:00 |
03:47:48.62 |
-23:40:10.7 |
HIP 17717 |
12.48 |
| 2026-08-13 12:00 |
03:47:49.47 |
-23:40:49.8 |
HIP 17717 |
11.87 |
| 2026-08-14 00:00 |
03:47:50.29 |
-23:41:29.0 |
HIP 17717 |
11.27 |
| 2026-08-14 12:00 |
03:47:51.07 |
-23:42:08.4 |
HIP 17717 |
10.67 |
| 2026-08-15 00:00 |
03:47:51.81 |
-23:42:47.9 |
HIP 17717 |
10.08 |
| 2026-08-15 12:00 |
03:47:52.51 |
-23:43:27.5 |
HIP 17717 |
9.50 |
| 2026-08-16 00:00 |
03:47:53.18 |
-23:44:07.3 |
HIP 17717 |
8.92 |
| 2026-08-16 12:00 |
03:47:53.81 |
-23:44:47.2 |
HIP 17717 |
8.36 |
| 2026-08-17 00:00 |
03:47:54.40 |
-23:45:27.3 |
HIP 17717 |
7.80 |
| 2026-08-17 12:00 |
03:47:54.96 |
-23:46:07.4 |
HIP 17717 |
7.27 |
| 2026-08-18 00:00 |
03:47:55.48 |
-23:46:47.7 |
HIP 17717 |
6.75 |
| 2026-08-18 12:00 |
03:47:55.96 |
-23:47:28.2 |
HIP 17717 |
6.26 |
| 2026-08-19 00:00 |
03:47:56.40 |
-23:48:08.7 |
HIP 17717 |
5.80 |