メタデータ
| 項目 |
値 |
| Designation |
C/2013 D1 (Holvorcem) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-04-13T17:17:27.458880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:30Z |
| Obs used |
118 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-03-26.0000000 |
| e |
0.78087861 |
| q (au) |
2.460129 |
| a (au) |
11.227243 |
| i (deg) |
10.093564 |
| Ω (om, deg) |
294.974884 |
| ω (w, deg) |
252.631501 |
| M (ma, deg) |
359.509532 |
等級
散乱 + 全体線形
$$
M_a = (14.750 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.750 |
| n |
6.000 |
| gf |
0.967 |
| gb |
-0.790 |
| k |
0.800 |
| δ90 |
5.235 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
23:40:23.78 |
+07:12:31.4 |
HIP 116731 |
17.01 |
| 2026-05-12 12:00 |
23:40:27.52 |
+07:13:08.3 |
HIP 116731 |
18.11 |
| 2026-05-13 00:00 |
23:40:31.23 |
+07:13:45.1 |
HIP 116731 |
19.21 |
| 2026-05-13 12:00 |
23:40:34.90 |
+07:14:21.7 |
HIP 116918 |
20.30 |
| 2026-05-14 00:00 |
23:40:38.53 |
+07:14:58.1 |
HIP 116918 |
19.39 |
| 2026-05-14 12:00 |
23:40:42.12 |
+07:15:34.4 |
HIP 116918 |
18.50 |
| 2026-05-15 00:00 |
23:40:45.67 |
+07:16:10.5 |
HIP 116918 |
17.65 |
| 2026-05-15 12:00 |
23:40:49.19 |
+07:16:46.4 |
HIP 116918 |
16.83 |
| 2026-05-16 00:00 |
23:40:52.67 |
+07:17:22.1 |
HIP 116918 |
16.05 |
| 2026-05-16 12:00 |
23:40:56.10 |
+07:17:57.7 |
HIP 116918 |
15.31 |
| 2026-05-17 00:00 |
23:40:59.50 |
+07:18:33.0 |
HIP 116918 |
14.61 |
| 2026-05-17 12:00 |
23:41:02.86 |
+07:19:08.2 |
HIP 116918 |
13.97 |
| 2026-05-18 00:00 |
23:41:06.18 |
+07:19:43.2 |
HIP 116918 |
13.38 |
| 2026-05-18 12:00 |
23:41:09.45 |
+07:20:18.1 |
HIP 116918 |
12.84 |
| 2026-05-19 00:00 |
23:41:12.69 |
+07:20:52.7 |
HIP 116918 |
12.38 |
| 2026-05-19 12:00 |
23:41:15.89 |
+07:21:27.1 |
HIP 116918 |
11.98 |
| 2026-05-20 00:00 |
23:41:19.05 |
+07:22:01.4 |
HIP 116918 |
11.66 |
| 2026-05-20 12:00 |
23:41:22.16 |
+07:22:35.4 |
HIP 116918 |
11.42 |
| 2026-05-21 00:00 |
23:41:25.24 |
+07:23:09.3 |
HIP 116918 |
11.26 |
| 2026-05-21 12:00 |
23:41:28.27 |
+07:23:42.9 |
HIP 116918 |
11.18 |
| 2026-05-22 00:00 |
23:41:31.26 |
+07:24:16.4 |
HIP 116918 |
11.18 |
| 2026-05-22 12:00 |
23:41:34.21 |
+07:24:49.6 |
HIP 116918 |
11.27 |
| 2026-05-23 00:00 |
23:41:37.12 |
+07:25:22.6 |
HIP 116918 |
11.42 |
| 2026-05-23 12:00 |
23:41:39.99 |
+07:25:55.5 |
HIP 116918 |
11.65 |
| 2026-05-24 00:00 |
23:41:42.81 |
+07:26:28.1 |
HIP 116918 |
11.94 |
| 2026-05-24 12:00 |
23:41:45.59 |
+07:27:00.5 |
HIP 116918 |
12.28 |
| 2026-05-25 00:00 |
23:41:48.33 |
+07:27:32.7 |
HIP 116918 |
12.68 |
| 2026-05-25 12:00 |
23:41:51.03 |
+07:28:04.7 |
HIP 116918 |
13.11 |
| 2026-05-26 00:00 |
23:41:53.69 |
+07:28:36.4 |
HIP 116918 |
13.59 |
| 2026-05-26 12:00 |
23:41:56.30 |
+07:29:08.0 |
HIP 116918 |
14.09 |
| 2026-05-27 00:00 |
23:41:58.87 |
+07:29:39.3 |
HIP 116918 |
14.63 |
| 2026-05-27 12:00 |
23:42:01.39 |
+07:30:10.4 |
HIP 116918 |
15.18 |
| 2026-05-28 00:00 |
23:42:03.88 |
+07:30:41.3 |
HIP 116918 |
15.75 |
| 2026-05-28 12:00 |
23:42:06.32 |
+07:31:12.0 |
HIP 116918 |
16.34 |
| 2026-05-29 00:00 |
23:42:08.71 |
+07:31:42.4 |
HIP 116918 |
16.93 |
| 2026-05-29 12:00 |
23:42:11.07 |
+07:32:12.6 |
HIP 116918 |
17.54 |
| 2026-05-30 00:00 |
23:42:13.38 |
+07:32:42.6 |
HIP 116918 |
18.15 |
| 2026-05-30 12:00 |
23:42:15.64 |
+07:33:12.4 |
HIP 116918 |
18.76 |
| 2026-05-31 00:00 |
23:42:17.86 |
+07:33:41.9 |
HIP 116918 |
19.38 |
| 2026-05-31 12:00 |
23:42:20.04 |
+07:34:11.2 |
HIP 116918 |
20.00 |
| 2026-06-01 00:00 |
23:42:22.17 |
+07:34:40.2 |
HIP 116918 |
20.62 |
| 2026-06-01 12:00 |
23:42:24.26 |
+07:35:09.0 |
HIP 116918 |
21.24 |
| 2026-06-02 00:00 |
23:42:26.30 |
+07:35:37.6 |
HIP 116918 |
21.86 |