メタデータ
| 項目 |
値 |
| Designation |
C/1972 F1 (Gehrels) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1971-01-06T12:19:44.146560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
18 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1972-08-05.0000000 |
| e |
0.99788599 |
| q (au) |
3.276471 |
| a (au) |
1549.882081 |
| i (deg) |
175.610745 |
| Ω (om, deg) |
24.754752 |
| ω (w, deg) |
128.702717 |
| M (ma, deg) |
0.009312 |
等級
散乱 + 全体線形
$$
M_a = (8.957 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.957 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.900 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
06:37:59.74 |
+18:57:44.1 |
HIP 31618 |
18.09 |
| 2026-06-01 12:00 |
06:38:01.05 |
+18:57:43.7 |
HIP 31618 |
18.33 |
| 2026-06-02 00:00 |
06:38:02.37 |
+18:57:43.2 |
HIP 31618 |
18.57 |
| 2026-06-02 12:00 |
06:38:03.70 |
+18:57:42.7 |
HIP 31618 |
18.82 |
| 2026-06-03 00:00 |
06:38:05.04 |
+18:57:42.3 |
HIP 31618 |
19.07 |
| 2026-06-03 12:00 |
06:38:06.38 |
+18:57:41.7 |
HIP 31618 |
19.32 |
| 2026-06-04 00:00 |
06:38:07.72 |
+18:57:41.2 |
HIP 31618 |
19.58 |
| 2026-06-04 12:00 |
06:38:09.07 |
+18:57:40.7 |
HIP 31618 |
19.84 |
| 2026-06-05 00:00 |
06:38:10.43 |
+18:57:40.1 |
HIP 31618 |
20.10 |
| 2026-06-05 12:00 |
06:38:11.79 |
+18:57:39.6 |
HIP 31618 |
20.36 |
| 2026-06-06 00:00 |
06:38:13.16 |
+18:57:39.0 |
HIP 31618 |
20.63 |
| 2026-06-06 12:00 |
06:38:14.53 |
+18:57:38.3 |
HIP 31618 |
20.90 |
| 2026-06-07 00:00 |
06:38:15.91 |
+18:57:37.7 |
HIP 31618 |
21.18 |
| 2026-06-07 12:00 |
06:38:17.29 |
+18:57:37.1 |
HIP 31618 |
21.45 |
| 2026-06-08 00:00 |
06:38:18.68 |
+18:57:36.4 |
HIP 31618 |
21.73 |
| 2026-06-08 12:00 |
06:38:20.07 |
+18:57:35.7 |
HIP 31618 |
22.01 |
| 2026-06-09 00:00 |
06:38:21.47 |
+18:57:35.0 |
HIP 31618 |
22.30 |
| 2026-06-09 12:00 |
06:38:22.87 |
+18:57:34.3 |
HIP 31618 |
22.58 |
| 2026-06-10 00:00 |
06:38:24.27 |
+18:57:33.5 |
HIP 31618 |
22.87 |
| 2026-06-10 12:00 |
06:38:25.68 |
+18:57:32.8 |
HIP 31618 |
23.16 |
| 2026-06-11 00:00 |
06:38:27.10 |
+18:57:32.0 |
HIP 31618 |
23.45 |
| 2026-06-11 12:00 |
06:38:28.52 |
+18:57:31.2 |
HIP 31618 |
23.75 |
| 2026-06-12 00:00 |
06:38:29.94 |
+18:57:30.4 |
HIP 31618 |
24.04 |
| 2026-06-12 12:00 |
06:38:31.37 |
+18:57:29.6 |
HIP 31618 |
24.34 |
| 2026-06-13 00:00 |
06:38:32.80 |
+18:57:28.7 |
HIP 31618 |
24.64 |
| 2026-06-13 12:00 |
06:38:34.23 |
+18:57:27.9 |
HIP 31618 |
24.95 |
| 2026-06-14 00:00 |
06:38:35.67 |
+18:57:27.0 |
HIP 31618 |
25.25 |
| 2026-06-14 12:00 |
06:38:37.11 |
+18:57:26.1 |
HIP 31713 |
25.48 |
| 2026-06-15 00:00 |
06:38:38.56 |
+18:57:25.2 |
HIP 31713 |
25.59 |
| 2026-06-15 12:00 |
06:38:40.01 |
+18:57:24.3 |
HIP 31713 |
25.69 |
| 2026-06-16 00:00 |
06:38:41.46 |
+18:57:23.3 |
HIP 31713 |
25.81 |
| 2026-06-16 12:00 |
06:38:42.92 |
+18:57:22.3 |
HIP 31713 |
25.92 |
| 2026-06-17 00:00 |
06:38:44.38 |
+18:57:21.4 |
HIP 31713 |
26.04 |
| 2026-06-17 12:00 |
06:38:45.84 |
+18:57:20.4 |
HIP 31713 |
26.16 |
| 2026-06-18 00:00 |
06:38:47.30 |
+18:57:19.3 |
HIP 31713 |
26.29 |
| 2026-06-18 12:00 |
06:38:48.77 |
+18:57:18.3 |
HIP 31713 |
26.42 |
| 2026-06-19 00:00 |
06:38:50.24 |
+18:57:17.3 |
HIP 31713 |
26.56 |
| 2026-06-19 12:00 |
06:38:51.71 |
+18:57:16.2 |
HIP 31713 |
26.70 |
| 2026-06-20 00:00 |
06:38:53.18 |
+18:57:15.1 |
HIP 31713 |
26.84 |
| 2026-06-20 12:00 |
06:38:54.66 |
+18:57:14.0 |
HIP 31713 |
26.99 |
| 2026-06-21 00:00 |
06:38:56.14 |
+18:57:12.9 |
HIP 31713 |
27.14 |
| 2026-06-21 12:00 |
06:38:57.62 |
+18:57:11.8 |
HIP 31713 |
27.30 |
| 2026-06-22 00:00 |
06:38:59.10 |
+18:57:10.6 |
HIP 31713 |
27.45 |