메타데이터
| 항목 |
값 |
| Designation |
168P/Hergenrother |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-10-01T22:24:03.841920Z |
| Orbit solution date (soln_date, UTC) |
2025-11-21T13:43:00Z |
| Obs used |
3377 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
44.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-10-05.0000000 |
| e |
0.60947452 |
| q (au) |
1.415279 |
| a (au) |
3.624038 |
| i (deg) |
21.929366 |
| Ω (om, deg) |
356.477671 |
| ω (w, deg) |
13.919130 |
| M (ma, deg) |
308.150819 |
밝기
산란 + 전체 선형
$$
M_a = (14.192 + 5.655\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.192 |
| n |
5.655 |
| gf |
0.917 |
| gb |
-0.534 |
| k |
0.991 |
| δ90 |
3.771 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
05:39:07.94 |
+37:27:25.3 |
HIP 26675 |
16.03 |
| 2026-07-29 12:00 |
05:40:47.53 |
+37:31:24.0 |
HIP 26675 |
10.37 |
| 2026-07-30 00:00 |
05:42:26.98 |
+37:35:18.1 |
HIP 26733 |
25.05 |
| 2026-07-30 12:00 |
05:44:06.29 |
+37:39:07.7 |
HIP 27105 |
10.08 |
| 2026-07-31 00:00 |
05:45:45.45 |
+37:42:52.9 |
HIP 27189 |
3.38 |
| 2026-07-31 12:00 |
05:47:24.46 |
+37:46:33.7 |
HIP 27300 |
18.99 |
| 2026-08-01 00:00 |
05:49:03.31 |
+37:50:10.1 |
HIP 27300 |
28.00 |
| 2026-08-01 12:00 |
05:50:42.00 |
+37:53:42.1 |
HIP 27706 |
15.78 |
| 2026-08-02 00:00 |
05:52:20.53 |
+37:57:09.7 |
HIP 27706 |
8.29 |
| 2026-08-02 12:00 |
05:53:58.89 |
+38:00:33.1 |
HIP 27706 |
25.78 |
| 2026-08-03 00:00 |
05:55:37.08 |
+38:03:52.2 |
HIP 28152 |
20.39 |
| 2026-08-03 12:00 |
05:57:15.10 |
+38:07:07.1 |
HIP 28152 |
10.84 |
| 2026-08-04 00:00 |
05:58:52.94 |
+38:10:17.7 |
HIP 28152 |
24.10 |
| 2026-08-04 12:00 |
06:00:30.59 |
+38:13:24.2 |
HIP 28354 |
26.95 |
| 2026-08-05 00:00 |
06:02:08.06 |
+38:16:26.5 |
HIP 28588 |
26.78 |
| 2026-08-05 12:00 |
06:03:45.34 |
+38:19:24.7 |
HIP 28787 |
18.47 |
| 2026-08-06 00:00 |
06:05:22.43 |
+38:22:18.8 |
HIP 28787 |
14.78 |
| 2026-08-06 12:00 |
06:06:59.32 |
+38:25:08.9 |
HIP 28946 |
6.09 |
| 2026-08-07 00:00 |
06:08:36.01 |
+38:27:55.0 |
HIP 29204 |
15.29 |
| 2026-08-07 12:00 |
06:10:12.50 |
+38:30:37.1 |
HIP 29204 |
14.88 |
| 2026-08-08 00:00 |
06:11:48.78 |
+38:33:15.3 |
HIP 29452 |
15.14 |
| 2026-08-08 12:00 |
06:13:24.84 |
+38:35:49.6 |
HIP 29605 |
11.75 |
| 2026-08-09 00:00 |
06:15:00.69 |
+38:38:20.0 |
HIP 29605 |
8.31 |
| 2026-08-09 12:00 |
06:16:36.32 |
+38:40:46.6 |
HIP 29774 |
11.47 |
| 2026-08-10 00:00 |
06:18:11.73 |
+38:43:09.4 |
HIP 30018 |
14.84 |
| 2026-08-10 12:00 |
06:19:46.91 |
+38:45:28.5 |
HIP 30018 |
16.24 |
| 2026-08-11 00:00 |
06:21:21.85 |
+38:47:43.8 |
HIP 30074 |
28.90 |
| 2026-08-11 12:00 |
06:22:56.57 |
+38:49:55.5 |
HIP 30454 |
21.41 |
| 2026-08-12 00:00 |
06:24:31.04 |
+38:52:03.5 |
HIP 30454 |
15.37 |
| 2026-08-12 12:00 |
06:26:05.28 |
+38:54:07.9 |
HIP 30695 |
11.34 |
| 2026-08-13 00:00 |
06:27:39.27 |
+38:56:08.7 |
HIP 30695 |
8.16 |
| 2026-08-13 12:00 |
06:29:13.01 |
+38:58:06.1 |
HIP 30860 |
5.31 |
| 2026-08-14 00:00 |
06:30:46.50 |
+39:00:00.0 |
HIP 30974 |
8.54 |
| 2026-08-14 12:00 |
06:32:19.73 |
+39:01:50.3 |
HIP 30974 |
26.69 |
| 2026-08-15 00:00 |
06:33:52.71 |
+39:03:37.3 |
HIP 31377 |
15.86 |
| 2026-08-15 12:00 |
06:35:25.42 |
+39:05:20.9 |
HIP 31377 |
16.18 |
| 2026-08-16 00:00 |
06:36:57.87 |
+39:07:01.2 |
HIP 31757 |
18.68 |
| 2026-08-16 12:00 |
06:38:30.06 |
+39:08:38.2 |
HIP 31757 |
1.65 |
| 2026-08-17 00:00 |
06:40:01.98 |
+39:10:11.9 |
HIP 31995 |
13.63 |
| 2026-08-17 12:00 |
06:41:33.62 |
+39:11:42.4 |
HIP 31995 |
5.25 |
| 2026-08-18 00:00 |
06:43:04.99 |
+39:13:09.7 |
HIP 32158 |
4.48 |
| 2026-08-18 12:00 |
06:44:36.08 |
+39:14:34.0 |
HIP 32350 |
9.96 |
| 2026-08-19 00:00 |
06:46:06.89 |
+39:15:55.1 |
HIP 32350 |
12.67 |