メタデータ
| 項目 |
値 |
| Designation |
C/1932 M2 (Geddes) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1932-09-20T21:14:07.022400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:05Z |
| Obs used |
15 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1933-04-05.0000000 |
| e |
0.99929446 |
| q (au) |
2.312627 |
| a (au) |
3277.828381 |
| i (deg) |
124.976898 |
| Ω (om, deg) |
216.080116 |
| ω (w, deg) |
329.630678 |
| M (ma, deg) |
0.001030 |
等級
散乱 + 全体線形
$$
M_a = (3.349 + 3.145\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.349 |
| n |
3.145 |
| gf |
1.000 |
| gb |
-0.864 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
03:37:40.91 |
+56:57:16.5 |
HIP 16974 |
5.45 |
| 2026-03-26 12:00 |
03:37:42.04 |
+56:57:10.4 |
HIP 16974 |
5.28 |
| 2026-03-27 00:00 |
03:37:43.18 |
+56:57:04.4 |
HIP 16974 |
5.10 |
| 2026-03-27 12:00 |
03:37:44.33 |
+56:56:58.5 |
HIP 16974 |
4.93 |
| 2026-03-28 00:00 |
03:37:45.49 |
+56:56:52.6 |
HIP 16974 |
4.75 |
| 2026-03-28 12:00 |
03:37:46.66 |
+56:56:46.8 |
HIP 16974 |
4.58 |
| 2026-03-29 00:00 |
03:37:47.85 |
+56:56:41.1 |
HIP 16974 |
4.40 |
| 2026-03-29 12:00 |
03:37:49.05 |
+56:56:35.4 |
HIP 16974 |
4.23 |
| 2026-03-30 00:00 |
03:37:50.26 |
+56:56:29.8 |
HIP 16974 |
4.05 |
| 2026-03-30 12:00 |
03:37:51.48 |
+56:56:24.3 |
HIP 16974 |
3.87 |
| 2026-03-31 00:00 |
03:37:52.72 |
+56:56:18.9 |
HIP 16974 |
3.70 |
| 2026-03-31 12:00 |
03:37:53.96 |
+56:56:13.5 |
HIP 16974 |
3.52 |
| 2026-04-01 00:00 |
03:37:55.22 |
+56:56:08.3 |
HIP 16974 |
3.34 |
| 2026-04-01 12:00 |
03:37:56.48 |
+56:56:03.1 |
HIP 16974 |
3.17 |
| 2026-04-02 00:00 |
03:37:57.76 |
+56:55:57.9 |
HIP 16974 |
2.99 |
| 2026-04-02 12:00 |
03:37:59.05 |
+56:55:52.9 |
HIP 16974 |
2.82 |
| 2026-04-03 00:00 |
03:38:00.35 |
+56:55:47.9 |
HIP 16974 |
2.65 |
| 2026-04-03 12:00 |
03:38:01.66 |
+56:55:43.0 |
HIP 16974 |
2.47 |
| 2026-04-04 00:00 |
03:38:02.98 |
+56:55:38.1 |
HIP 16974 |
2.31 |
| 2026-04-04 12:00 |
03:38:04.32 |
+56:55:33.4 |
HIP 16974 |
2.14 |
| 2026-04-05 00:00 |
03:38:05.66 |
+56:55:28.7 |
HIP 16974 |
1.98 |
| 2026-04-05 12:00 |
03:38:07.01 |
+56:55:24.1 |
HIP 16974 |
1.82 |
| 2026-04-06 00:00 |
03:38:08.38 |
+56:55:19.6 |
HIP 16974 |
1.67 |
| 2026-04-06 12:00 |
03:38:09.75 |
+56:55:15.1 |
HIP 16974 |
1.54 |
| 2026-04-07 00:00 |
03:38:11.14 |
+56:55:10.7 |
HIP 16974 |
1.41 |
| 2026-04-07 12:00 |
03:38:12.53 |
+56:55:06.4 |
HIP 16974 |
1.30 |
| 2026-04-08 00:00 |
03:38:13.93 |
+56:55:02.2 |
HIP 16974 |
1.22 |
| 2026-04-08 12:00 |
03:38:15.35 |
+56:54:58.1 |
HIP 16974 |
1.16 |
| 2026-04-09 00:00 |
03:38:16.77 |
+56:54:54.0 |
HIP 16974 |
1.14 |
| 2026-04-09 12:00 |
03:38:18.21 |
+56:54:50.1 |
HIP 16974 |
1.15 |
| 2026-04-10 00:00 |
03:38:19.65 |
+56:54:46.2 |
HIP 16974 |
1.20 |
| 2026-04-10 12:00 |
03:38:21.10 |
+56:54:42.3 |
HIP 16974 |
1.28 |
| 2026-04-11 00:00 |
03:38:22.56 |
+56:54:38.6 |
HIP 16974 |
1.38 |
| 2026-04-11 12:00 |
03:38:24.03 |
+56:54:34.9 |
HIP 16974 |
1.51 |
| 2026-04-12 00:00 |
03:38:25.51 |
+56:54:31.3 |
HIP 16974 |
1.65 |
| 2026-04-12 12:00 |
03:38:27.00 |
+56:54:27.8 |
HIP 16974 |
1.80 |
| 2026-04-13 00:00 |
03:38:28.50 |
+56:54:24.4 |
HIP 16974 |
1.97 |
| 2026-04-13 12:00 |
03:38:30.01 |
+56:54:21.1 |
HIP 16974 |
2.14 |
| 2026-04-14 00:00 |
03:38:31.52 |
+56:54:17.8 |
HIP 16974 |
2.32 |
| 2026-04-14 12:00 |
03:38:33.05 |
+56:54:14.6 |
HIP 16974 |
2.51 |
| 2026-04-15 00:00 |
03:38:34.58 |
+56:54:11.5 |
HIP 16974 |
2.70 |
| 2026-04-15 12:00 |
03:38:36.12 |
+56:54:08.5 |
HIP 16974 |
2.89 |
| 2026-04-16 00:00 |
03:38:37.67 |
+56:54:05.6 |
HIP 16974 |
3.09 |