メタデータ
| 項目 |
値 |
| Designation |
C/2012 V2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-08-16T12:00:32.616000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:28Z |
| Obs used |
1054 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
12.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-03-07.0000000 |
| e |
0.99762394 |
| q (au) |
1.454756 |
| a (au) |
612.254628 |
| i (deg) |
67.184787 |
| Ω (om, deg) |
262.164771 |
| ω (w, deg) |
217.323257 |
| M (ma, deg) |
359.989428 |
等級
散乱 + 全体線形
$$
M_a = (7.401 + 5.597\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.401 |
| n |
5.597 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.995 |
| 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 |
| 2012-10-30 |
2013-01-20 |
-3.2735 |
+1.646 |
| 2013-01-20 |
2013-03-25 |
-7.5578 |
+3.461 |
| 2013-03-25 |
2013-08-16 |
+13.2993 |
-4.446 |
| 2013-08-17 |
2013-11-06 |
+2.2762 |
-2.713 |
| 2013-11-06 |
2013-12-16 |
-9.8137 |
+1.381 |
| 2013-12-16 |
2014-05-16 |
+7.6762 |
-3.882 |
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 |
17:49:37.74 |
-12:04:17.3 |
HIP 87268 |
32.56 |
| 2026-06-01 12:00 |
17:49:33.80 |
-12:04:09.3 |
HIP 87268 |
32.83 |
| 2026-06-02 00:00 |
17:49:29.86 |
-12:04:01.4 |
HIP 87268 |
33.13 |
| 2026-06-02 12:00 |
17:49:25.90 |
-12:03:53.5 |
HIP 87268 |
33.45 |
| 2026-06-03 00:00 |
17:49:21.93 |
-12:03:45.8 |
HIP 87268 |
33.80 |
| 2026-06-03 12:00 |
17:49:17.96 |
-12:03:38.1 |
HIP 87268 |
34.17 |
| 2026-06-04 00:00 |
17:49:13.97 |
-12:03:30.6 |
HIP 87268 |
34.57 |
| 2026-06-04 12:00 |
17:49:09.98 |
-12:03:23.1 |
HIP 87268 |
34.98 |
| 2026-06-05 00:00 |
17:49:05.97 |
-12:03:15.8 |
HIP 87268 |
35.42 |
| 2026-06-05 12:00 |
17:49:01.96 |
-12:03:08.5 |
HIP 87268 |
35.88 |
| 2026-06-06 00:00 |
17:48:57.94 |
-12:03:01.3 |
HIP 87268 |
36.36 |
| 2026-06-06 12:00 |
17:48:53.91 |
-12:02:54.2 |
HIP 87268 |
36.86 |
| 2026-06-07 00:00 |
17:48:49.88 |
-12:02:47.2 |
HIP 87268 |
37.38 |
| 2026-06-07 12:00 |
17:48:45.84 |
-12:02:40.3 |
HIP 87268 |
37.92 |
| 2026-06-08 00:00 |
17:48:41.79 |
-12:02:33.5 |
HIP 87268 |
38.47 |
| 2026-06-08 12:00 |
17:48:37.73 |
-12:02:26.8 |
HIP 87268 |
39.04 |
| 2026-06-09 00:00 |
17:48:33.67 |
-12:02:20.2 |
HIP 87268 |
39.63 |
| 2026-06-09 12:00 |
17:48:29.60 |
-12:02:13.7 |
HIP 87268 |
40.23 |
| 2026-06-10 00:00 |
17:48:25.53 |
-12:02:07.3 |
HIP 87268 |
40.85 |
| 2026-06-10 12:00 |
17:48:21.45 |
-12:02:01.0 |
HIP 87268 |
41.48 |
| 2026-06-11 00:00 |
17:48:17.37 |
-12:01:54.8 |
HIP 87268 |
42.13 |
| 2026-06-11 12:00 |
17:48:13.28 |
-12:01:48.7 |
HIP 87268 |
42.78 |
| 2026-06-12 00:00 |
17:48:09.19 |
-12:01:42.6 |
HIP 87213 |
43.39 |
| 2026-06-12 12:00 |
17:48:05.09 |
-12:01:36.7 |
HIP 87213 |
43.62 |
| 2026-06-13 00:00 |
17:48:00.99 |
-12:01:30.9 |
HIP 87213 |
43.88 |
| 2026-06-13 12:00 |
17:47:56.89 |
-12:01:25.2 |
HIP 87213 |
44.15 |
| 2026-06-14 00:00 |
17:47:52.79 |
-12:01:19.6 |
HIP 87213 |
44.46 |
| 2026-06-14 12:00 |
17:47:48.68 |
-12:01:14.0 |
HIP 87213 |
44.78 |
| 2026-06-15 00:00 |
17:47:44.57 |
-12:01:08.6 |
HIP 87213 |
45.12 |
| 2026-06-15 12:00 |
17:47:40.46 |
-12:01:03.3 |
HIP 87213 |
45.49 |
| 2026-06-16 00:00 |
17:47:36.34 |
-12:00:58.1 |
HIP 87213 |
45.88 |
| 2026-06-16 12:00 |
17:47:32.23 |
-12:00:53.0 |
HIP 87213 |
46.29 |
| 2026-06-17 00:00 |
17:47:28.12 |
-12:00:47.9 |
HIP 86818 |
45.32 |
| 2026-06-17 12:00 |
17:47:24.00 |
-12:00:43.0 |
HIP 86818 |
44.31 |
| 2026-06-18 00:00 |
17:47:19.89 |
-12:00:38.2 |
HIP 86818 |
43.31 |
| 2026-06-18 12:00 |
17:47:15.77 |
-12:00:33.5 |
HIP 86818 |
42.30 |
| 2026-06-19 00:00 |
17:47:11.66 |
-12:00:28.9 |
HIP 86818 |
41.30 |
| 2026-06-19 12:00 |
17:47:07.54 |
-12:00:24.4 |
HIP 86818 |
40.29 |
| 2026-06-20 00:00 |
17:47:03.43 |
-12:00:20.0 |
HIP 86818 |
39.29 |
| 2026-06-20 12:00 |
17:46:59.32 |
-12:00:15.6 |
HIP 86818 |
38.29 |
| 2026-06-21 00:00 |
17:46:55.21 |
-12:00:11.4 |
HIP 86818 |
37.28 |
| 2026-06-21 12:00 |
17:46:51.11 |
-12:00:07.3 |
HIP 86818 |
36.28 |
| 2026-06-22 00:00 |
17:46:47.01 |
-12:00:03.3 |
HIP 86818 |
35.28 |