메타데이터
| 항목 |
값 |
| Designation |
164P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-31T09:35:06.561600Z |
| Orbit solution date (soln_date, UTC) |
2026-07-20T21:57:30Z |
| Obs used |
1861 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-08-30.0000000 |
| e |
0.53972209 |
| q (au) |
1.685229 |
| a (au) |
3.661328 |
| i (deg) |
16.252976 |
| Ω (om, deg) |
88.305871 |
| ω (w, deg) |
325.925833 |
| M (ma, deg) |
12.746097 |
밝기
산란 + 전체 선형
$$
M_a = (13.705 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.705 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.699 |
| k |
0.989 |
| δ90 |
10.000 |
| 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 |
11:35:05.66 |
+17:39:38.1 |
HIP 56548 |
15.34 |
| 2026-07-29 12:00 |
11:35:35.86 |
+17:35:32.4 |
HIP 56548 |
16.99 |
| 2026-07-30 00:00 |
11:36:06.09 |
+17:31:26.9 |
HIP 56548 |
21.88 |
| 2026-07-30 12:00 |
11:36:36.35 |
+17:27:21.5 |
HIP 56548 |
28.40 |
| 2026-07-31 00:00 |
11:37:06.65 |
+17:23:16.3 |
HIP 56578 |
29.89 |
| 2026-07-31 12:00 |
11:37:36.98 |
+17:19:11.2 |
HIP 56821 |
22.20 |
| 2026-08-01 00:00 |
11:38:07.35 |
+17:15:06.4 |
HIP 56821 |
13.98 |
| 2026-08-01 12:00 |
11:38:37.75 |
+17:11:01.7 |
HIP 56821 |
6.00 |
| 2026-08-02 00:00 |
11:39:08.18 |
+17:06:57.1 |
HIP 56821 |
3.93 |
| 2026-08-02 12:00 |
11:39:38.64 |
+17:02:52.8 |
HIP 56821 |
11.58 |
| 2026-08-03 00:00 |
11:40:09.14 |
+16:58:48.6 |
HIP 56981 |
10.19 |
| 2026-08-03 12:00 |
11:40:39.66 |
+16:54:44.6 |
HIP 56981 |
6.59 |
| 2026-08-04 00:00 |
11:41:10.22 |
+16:50:40.8 |
HIP 56981 |
11.08 |
| 2026-08-04 12:00 |
11:41:40.81 |
+16:46:37.1 |
HIP 56981 |
18.50 |
| 2026-08-05 00:00 |
11:42:11.42 |
+16:42:33.7 |
HIP 56981 |
26.49 |
| 2026-08-05 12:00 |
11:42:42.07 |
+16:38:30.4 |
HIP 57204 |
24.81 |
| 2026-08-06 00:00 |
11:43:12.74 |
+16:34:27.4 |
HIP 57204 |
17.28 |
| 2026-08-06 12:00 |
11:43:43.45 |
+16:30:24.5 |
HIP 57204 |
11.07 |
| 2026-08-07 00:00 |
11:44:14.18 |
+16:26:21.8 |
HIP 57204 |
9.38 |
| 2026-08-07 12:00 |
11:44:44.94 |
+16:22:19.4 |
HIP 57204 |
13.97 |
| 2026-08-08 00:00 |
11:45:15.73 |
+16:18:17.1 |
HIP 57204 |
21.07 |
| 2026-08-08 12:00 |
11:45:46.54 |
+16:14:15.1 |
HIP 57337 |
27.79 |
| 2026-08-09 00:00 |
11:46:17.38 |
+16:10:13.2 |
HIP 57337 |
26.63 |
| 2026-08-09 12:00 |
11:46:48.25 |
+16:06:11.6 |
HIP 57337 |
28.09 |
| 2026-08-10 00:00 |
11:47:19.14 |
+16:02:10.2 |
HIP 57630 |
25.34 |
| 2026-08-10 12:00 |
11:47:50.06 |
+15:58:09.0 |
HIP 57630 |
19.84 |
| 2026-08-11 00:00 |
11:48:21.00 |
+15:54:08.1 |
HIP 57630 |
16.95 |
| 2026-08-11 12:00 |
11:48:51.96 |
+15:50:07.4 |
HIP 57630 |
17.98 |
| 2026-08-12 00:00 |
11:49:22.95 |
+15:46:06.9 |
HIP 57752 |
18.57 |
| 2026-08-12 12:00 |
11:49:53.96 |
+15:42:06.7 |
HIP 57752 |
11.09 |
| 2026-08-13 00:00 |
11:50:24.99 |
+15:38:06.7 |
HIP 57752 |
6.65 |
| 2026-08-13 12:00 |
11:50:56.05 |
+15:34:07.0 |
HIP 57752 |
10.44 |
| 2026-08-14 00:00 |
11:51:27.12 |
+15:30:07.6 |
HIP 57752 |
17.82 |
| 2026-08-14 12:00 |
11:51:58.22 |
+15:26:08.4 |
HIP 57920 |
11.56 |
| 2026-08-15 00:00 |
11:52:29.33 |
+15:22:09.5 |
HIP 57920 |
5.73 |
| 2026-08-15 12:00 |
11:53:00.47 |
+15:18:10.8 |
HIP 57920 |
8.71 |
| 2026-08-16 00:00 |
11:53:31.62 |
+15:14:12.5 |
HIP 58056 |
13.09 |
| 2026-08-16 12:00 |
11:54:02.79 |
+15:10:14.4 |
HIP 58056 |
7.45 |
| 2026-08-17 00:00 |
11:54:33.98 |
+15:06:16.6 |
HIP 58056 |
9.17 |
| 2026-08-17 12:00 |
11:55:05.18 |
+15:02:19.1 |
HIP 58130 |
6.13 |
| 2026-08-18 00:00 |
11:55:36.40 |
+14:58:21.8 |
HIP 58130 |
8.92 |
| 2026-08-18 12:00 |
11:56:07.64 |
+14:54:24.9 |
HIP 58130 |
16.32 |
| 2026-08-19 00:00 |
11:56:38.89 |
+14:50:28.3 |
HIP 58276 |
21.60 |