メタデータ
| 項目 |
値 |
| Designation |
111P/Helin-Roman-Crockett |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-01-30T15:06:06.327360Z |
| Orbit solution date (soln_date, UTC) |
2013-01-28T09:17:54Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
17.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-01-28.0000000 |
| e |
0.10962077 |
| q (au) |
3.704303 |
| a (au) |
4.160366 |
| i (deg) |
4.228807 |
| Ω (om, deg) |
89.793998 |
| ω (w, deg) |
3.377942 |
| M (ma, deg) |
359.694623 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
20:13:48.66 |
-22:50:41.1 |
HIP 99609 |
15.38 |
| 2026-07-29 12:00 |
20:13:29.84 |
-22:51:51.9 |
HIP 99609 |
11.24 |
| 2026-07-30 00:00 |
20:13:11.04 |
-22:53:02.2 |
HIP 99609 |
7.54 |
| 2026-07-30 12:00 |
20:12:52.27 |
-22:54:12.1 |
HIP 99609 |
5.24 |
| 2026-07-31 00:00 |
20:12:33.54 |
-22:55:21.6 |
HIP 99609 |
6.17 |
| 2026-07-31 12:00 |
20:12:14.84 |
-22:56:30.5 |
HIP 99609 |
9.41 |
| 2026-08-01 00:00 |
20:11:56.18 |
-22:57:38.9 |
HIP 99609 |
13.36 |
| 2026-08-01 12:00 |
20:11:37.57 |
-22:58:46.9 |
HIP 99609 |
17.53 |
| 2026-08-02 00:00 |
20:11:19.00 |
-22:59:54.3 |
HIP 99609 |
21.80 |
| 2026-08-02 12:00 |
20:11:00.48 |
-23:01:01.3 |
HIP 99609 |
26.10 |
| 2026-08-03 00:00 |
20:10:42.01 |
-23:02:07.6 |
HIP 99609 |
30.42 |
| 2026-08-03 12:00 |
20:10:23.60 |
-23:03:13.5 |
HIP 99609 |
34.74 |
| 2026-08-04 00:00 |
20:10:05.25 |
-23:04:18.8 |
HIP 99229 |
37.26 |
| 2026-08-04 12:00 |
20:09:46.97 |
-23:05:23.5 |
HIP 99229 |
34.17 |
| 2026-08-05 00:00 |
20:09:28.75 |
-23:06:27.7 |
HIP 99229 |
31.39 |
| 2026-08-05 12:00 |
20:09:10.60 |
-23:07:31.3 |
HIP 99229 |
29.01 |
| 2026-08-06 00:00 |
20:08:52.53 |
-23:08:34.3 |
HIP 99229 |
27.11 |
| 2026-08-06 12:00 |
20:08:34.53 |
-23:09:36.7 |
HIP 99229 |
25.81 |
| 2026-08-07 00:00 |
20:08:16.61 |
-23:10:38.6 |
HIP 99229 |
25.17 |
| 2026-08-07 12:00 |
20:07:58.78 |
-23:11:39.8 |
HIP 99229 |
25.24 |
| 2026-08-08 00:00 |
20:07:41.04 |
-23:12:40.4 |
HIP 99229 |
26.00 |
| 2026-08-08 12:00 |
20:07:23.39 |
-23:13:40.3 |
HIP 99229 |
27.38 |
| 2026-08-09 00:00 |
20:07:05.83 |
-23:14:39.7 |
HIP 99229 |
29.29 |
| 2026-08-09 12:00 |
20:06:48.37 |
-23:15:38.4 |
HIP 99229 |
31.62 |
| 2026-08-10 00:00 |
20:06:31.01 |
-23:16:36.4 |
HIP 99229 |
34.27 |
| 2026-08-10 12:00 |
20:06:13.76 |
-23:17:33.8 |
HIP 99229 |
37.17 |
| 2026-08-11 00:00 |
20:05:56.62 |
-23:18:30.5 |
HIP 98752 |
39.93 |
| 2026-08-11 12:00 |
20:05:39.59 |
-23:19:26.6 |
HIP 98752 |
37.22 |
| 2026-08-12 00:00 |
20:05:22.68 |
-23:20:22.0 |
HIP 98752 |
34.77 |
| 2026-08-12 12:00 |
20:05:05.89 |
-23:21:16.7 |
HIP 98752 |
32.64 |
| 2026-08-13 00:00 |
20:04:49.22 |
-23:22:10.7 |
HIP 98752 |
30.88 |
| 2026-08-13 12:00 |
20:04:32.67 |
-23:23:04.0 |
HIP 98752 |
29.55 |
| 2026-08-14 00:00 |
20:04:16.25 |
-23:23:56.6 |
HIP 98752 |
28.70 |
| 2026-08-14 12:00 |
20:03:59.97 |
-23:24:48.5 |
HIP 98752 |
28.34 |
| 2026-08-15 00:00 |
20:03:43.82 |
-23:25:39.6 |
HIP 98752 |
28.50 |
| 2026-08-15 12:00 |
20:03:27.82 |
-23:26:30.1 |
HIP 98752 |
29.15 |
| 2026-08-16 00:00 |
20:03:11.95 |
-23:27:19.8 |
HIP 98752 |
30.24 |
| 2026-08-16 12:00 |
20:02:56.23 |
-23:28:08.8 |
HIP 98752 |
31.72 |
| 2026-08-17 00:00 |
20:02:40.65 |
-23:28:57.1 |
HIP 98752 |
33.51 |
| 2026-08-17 12:00 |
20:02:25.23 |
-23:29:44.6 |
HIP 98752 |
35.58 |
| 2026-08-18 00:00 |
20:02:09.96 |
-23:30:31.4 |
HIP 98471 |
36.75 |
| 2026-08-18 12:00 |
20:01:54.84 |
-23:31:17.4 |
HIP 98471 |
33.88 |
| 2026-08-19 00:00 |
20:01:39.88 |
-23:32:02.7 |
HIP 98471 |
31.19 |