メタデータ
| 項目 |
値 |
| Designation |
C/2013 R1 (Lovejoy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-12-22T17:35:41.714880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:40Z |
| Obs used |
3894 |
| NEO |
- |
| M1 |
11.500 |
| K1 |
7.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-12-29.0000000 |
| e |
0.99842519 |
| q (au) |
0.811826 |
| a (au) |
515.505940 |
| i (deg) |
64.040953 |
| Ω (om, deg) |
70.711175 |
| ω (w, deg) |
67.166449 |
| M (ma, deg) |
0.000528 |
等級
散乱 + 全体線形
$$
M_a = (11.126 + 5.399\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.126 |
| n |
5.399 |
| gf |
1.000 |
| gb |
-0.758 |
| k |
0.800 |
| 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 |
| 2013-09-07 |
2013-12-22 |
+3.3697 |
-1.131 |
| 2013-12-22 |
2014-03-14 |
+1.6099 |
-2.730 |
| 2014-03-14 |
2014-09-14 |
+3.9594 |
-2.438 |
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) |
| 2026-09-20 00:00 |
18:31:44.26 |
-65:47:24.1 |
HIP 91108 |
30.83 |
| 2026-09-20 12:00 |
18:31:43.01 |
-65:46:46.6 |
HIP 91108 |
31.39 |
| 2026-09-21 00:00 |
18:31:41.85 |
-65:46:08.9 |
HIP 91193 |
31.26 |
| 2026-09-21 12:00 |
18:31:40.77 |
-65:45:31.3 |
HIP 90927 |
30.75 |
| 2026-09-22 00:00 |
18:31:39.78 |
-65:44:53.5 |
HIP 90927 |
30.17 |
| 2026-09-22 12:00 |
18:31:38.87 |
-65:44:15.8 |
HIP 90927 |
29.58 |
| 2026-09-23 00:00 |
18:31:38.04 |
-65:43:37.9 |
HIP 90927 |
29.00 |
| 2026-09-23 12:00 |
18:31:37.29 |
-65:43:00.1 |
HIP 90927 |
28.41 |
| 2026-09-24 00:00 |
18:31:36.63 |
-65:42:22.2 |
HIP 90927 |
27.83 |
| 2026-09-24 12:00 |
18:31:36.05 |
-65:41:44.2 |
HIP 90927 |
27.24 |
| 2026-09-25 00:00 |
18:31:35.55 |
-65:41:06.2 |
HIP 90927 |
26.65 |
| 2026-09-25 12:00 |
18:31:35.13 |
-65:40:28.2 |
HIP 90927 |
26.06 |
| 2026-09-26 00:00 |
18:31:34.80 |
-65:39:50.2 |
HIP 90927 |
25.47 |
| 2026-09-26 12:00 |
18:31:34.55 |
-65:39:12.1 |
HIP 90927 |
24.88 |
| 2026-09-27 00:00 |
18:31:34.38 |
-65:38:34.0 |
HIP 90927 |
24.29 |
| 2026-09-27 12:00 |
18:31:34.29 |
-65:37:55.9 |
HIP 90927 |
23.69 |
| 2026-09-28 00:00 |
18:31:34.29 |
-65:37:17.8 |
HIP 90927 |
23.10 |
| 2026-09-28 12:00 |
18:31:34.37 |
-65:36:39.6 |
HIP 90927 |
22.50 |
| 2026-09-29 00:00 |
18:31:34.53 |
-65:36:01.5 |
HIP 90927 |
21.91 |
| 2026-09-29 12:00 |
18:31:34.77 |
-65:35:23.3 |
HIP 90927 |
21.31 |
| 2026-09-30 00:00 |
18:31:35.09 |
-65:34:45.1 |
HIP 90927 |
20.71 |
| 2026-09-30 12:00 |
18:31:35.50 |
-65:34:07.0 |
HIP 90927 |
20.11 |
| 2026-10-01 00:00 |
18:31:35.98 |
-65:33:28.8 |
HIP 90927 |
19.51 |
| 2026-10-01 12:00 |
18:31:36.55 |
-65:32:50.6 |
HIP 90927 |
18.90 |
| 2026-10-02 00:00 |
18:31:37.20 |
-65:32:12.4 |
HIP 90927 |
18.30 |
| 2026-10-02 12:00 |
18:31:37.93 |
-65:31:34.2 |
HIP 90927 |
17.70 |
| 2026-10-03 00:00 |
18:31:38.74 |
-65:30:56.1 |
HIP 90927 |
17.09 |
| 2026-10-03 12:00 |
18:31:39.63 |
-65:30:17.9 |
HIP 90927 |
16.48 |
| 2026-10-04 00:00 |
18:31:40.60 |
-65:29:39.8 |
HIP 90927 |
15.87 |
| 2026-10-04 12:00 |
18:31:41.66 |
-65:29:01.7 |
HIP 90927 |
15.27 |
| 2026-10-05 00:00 |
18:31:42.79 |
-65:28:23.6 |
HIP 90927 |
14.66 |
| 2026-10-05 12:00 |
18:31:44.00 |
-65:27:45.5 |
HIP 90927 |
14.04 |
| 2026-10-06 00:00 |
18:31:45.30 |
-65:27:07.5 |
HIP 90927 |
13.43 |
| 2026-10-06 12:00 |
18:31:46.67 |
-65:26:29.4 |
HIP 90927 |
12.82 |
| 2026-10-07 00:00 |
18:31:48.13 |
-65:25:51.4 |
HIP 90927 |
12.21 |
| 2026-10-07 12:00 |
18:31:49.66 |
-65:25:13.5 |
HIP 90927 |
11.60 |
| 2026-10-08 00:00 |
18:31:51.28 |
-65:24:35.6 |
HIP 90927 |
10.98 |
| 2026-10-08 12:00 |
18:31:52.97 |
-65:23:57.7 |
HIP 90927 |
10.37 |
| 2026-10-09 00:00 |
18:31:54.74 |
-65:23:19.9 |
HIP 90927 |
9.76 |
| 2026-10-09 12:00 |
18:31:56.59 |
-65:22:42.1 |
HIP 90927 |
9.15 |
| 2026-10-10 00:00 |
18:31:58.52 |
-65:22:04.4 |
HIP 90927 |
8.55 |
| 2026-10-10 12:00 |
18:32:00.53 |
-65:21:26.7 |
HIP 90927 |
7.94 |
| 2026-10-11 00:00 |
18:32:02.62 |
-65:20:49.0 |
HIP 90927 |
7.34 |