メタデータ
| 項目 |
値 |
| Designation |
495P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-10-25T06:46:55.292160Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T11:12:51Z |
| Obs used |
118 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
7.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-09-08T07:05:23.683200Z |
| Discovery magnitude (MPC) |
21.04 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-02-08.0000000 |
| e |
0.27115512 |
| q (au) |
3.462563 |
| a (au) |
4.750755 |
| i (deg) |
26.355591 |
| Ω (om, deg) |
291.623353 |
| ω (w, deg) |
141.487838 |
| M (ma, deg) |
196.258045 |
等級
散乱 + 全体線形
$$
M_a = (17.873 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.873 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-0.721 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
08:05:53.81 |
+17:37:59.6 |
HIP 39587 |
7.64 |
| 2026-07-29 12:00 |
08:06:30.66 |
+17:34:29.2 |
HIP 39587 |
16.64 |
| 2026-07-30 00:00 |
08:07:07.45 |
+17:30:58.3 |
HIP 39737 |
20.43 |
| 2026-07-30 12:00 |
08:07:44.20 |
+17:27:26.9 |
HIP 39737 |
17.77 |
| 2026-07-31 00:00 |
08:08:20.90 |
+17:23:54.9 |
HIP 39737 |
19.81 |
| 2026-07-31 12:00 |
08:08:57.55 |
+17:20:22.5 |
HIP 39982 |
14.61 |
| 2026-08-01 00:00 |
08:09:34.16 |
+17:16:49.6 |
HIP 39982 |
5.18 |
| 2026-08-01 12:00 |
08:10:10.71 |
+17:13:16.2 |
HIP 39982 |
4.26 |
| 2026-08-02 00:00 |
08:10:47.22 |
+17:09:42.4 |
HIP 39982 |
13.67 |
| 2026-08-02 12:00 |
08:11:23.67 |
+17:06:08.0 |
HIP 40113 |
6.84 |
| 2026-08-03 00:00 |
08:12:00.08 |
+17:02:33.1 |
HIP 40113 |
6.52 |
| 2026-08-03 12:00 |
08:12:36.43 |
+16:58:57.8 |
HIP 40113 |
14.67 |
| 2026-08-04 00:00 |
08:13:12.73 |
+16:55:21.9 |
HIP 40289 |
17.60 |
| 2026-08-04 12:00 |
08:13:48.98 |
+16:51:45.6 |
HIP 40289 |
13.22 |
| 2026-08-05 00:00 |
08:14:25.18 |
+16:48:08.8 |
HIP 40289 |
14.69 |
| 2026-08-05 12:00 |
08:15:01.32 |
+16:44:31.5 |
HIP 40289 |
20.80 |
| 2026-08-06 00:00 |
08:15:37.42 |
+16:40:53.7 |
HIP 40289 |
28.72 |
| 2026-08-06 12:00 |
08:16:13.45 |
+16:37:15.4 |
HIP 40410 |
37.06 |
| 2026-08-07 00:00 |
08:16:49.44 |
+16:33:36.7 |
HIP 40410 |
39.12 |
| 2026-08-07 12:00 |
08:17:25.37 |
+16:29:57.5 |
HIP 40754 |
33.58 |
| 2026-08-08 00:00 |
08:18:01.24 |
+16:26:17.7 |
HIP 40754 |
24.95 |
| 2026-08-08 12:00 |
08:18:37.06 |
+16:22:37.6 |
HIP 40754 |
17.09 |
| 2026-08-09 00:00 |
08:19:12.82 |
+16:18:56.9 |
HIP 40754 |
11.68 |
| 2026-08-09 12:00 |
08:19:48.52 |
+16:15:15.8 |
HIP 40835 |
3.59 |
| 2026-08-10 00:00 |
08:20:24.17 |
+16:11:34.2 |
HIP 40835 |
5.78 |
| 2026-08-10 12:00 |
08:20:59.76 |
+16:07:52.1 |
HIP 40835 |
15.08 |
| 2026-08-11 00:00 |
08:21:35.29 |
+16:04:09.6 |
HIP 41040 |
14.70 |
| 2026-08-11 12:00 |
08:22:10.76 |
+16:00:26.6 |
HIP 41040 |
10.60 |
| 2026-08-12 00:00 |
08:22:46.16 |
+15:56:43.2 |
HIP 41040 |
13.48 |
| 2026-08-12 12:00 |
08:23:21.51 |
+15:52:59.3 |
HIP 41040 |
20.57 |
| 2026-08-13 00:00 |
08:23:56.80 |
+15:49:14.9 |
HIP 41040 |
28.93 |
| 2026-08-13 12:00 |
08:24:32.02 |
+15:45:30.1 |
HIP 41112 |
34.07 |
| 2026-08-14 00:00 |
08:25:07.18 |
+15:41:44.9 |
HIP 41112 |
36.41 |
| 2026-08-14 12:00 |
08:25:42.28 |
+15:37:59.2 |
HIP 41492 |
32.98 |
| 2026-08-15 00:00 |
08:26:17.31 |
+15:34:13.0 |
HIP 41492 |
28.21 |
| 2026-08-15 12:00 |
08:26:52.27 |
+15:30:26.5 |
HIP 41492 |
25.98 |
| 2026-08-16 00:00 |
08:27:27.18 |
+15:26:39.4 |
HIP 41506 |
21.79 |
| 2026-08-16 12:00 |
08:28:02.01 |
+15:22:52.0 |
HIP 41506 |
17.01 |
| 2026-08-17 00:00 |
08:28:36.78 |
+15:19:04.1 |
HIP 41506 |
16.52 |
| 2026-08-17 12:00 |
08:29:11.48 |
+15:15:15.8 |
HIP 41686 |
19.47 |
| 2026-08-18 00:00 |
08:29:46.11 |
+15:11:27.0 |
HIP 41686 |
20.75 |
| 2026-08-18 12:00 |
08:30:20.68 |
+15:07:37.9 |
HIP 41686 |
25.50 |
| 2026-08-19 00:00 |
08:30:55.18 |
+15:03:48.3 |
HIP 41873 |
25.44 |