메타데이터
| 항목 |
값 |
| Designation |
161P/Hartley-IRAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-06-20T19:16:47.193600Z |
| Orbit solution date (soln_date, UTC) |
2026-07-28T14:12:22Z |
| Obs used |
379 |
| NEO |
Yes |
| M1 |
10.600 |
| K1 |
17.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2006-09-13.0000000 |
| e |
0.83499385 |
| q (au) |
1.275542 |
| a (au) |
7.730270 |
| i (deg) |
95.675019 |
| Ω (om, deg) |
1.405222 |
| ω (w, deg) |
47.086836 |
| M (ma, deg) |
20.599118 |
밝기
산란 + 전체 선형
$$
M_a = (10.526 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.526 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
03:21:44.48 |
-19:48:19.6 |
HIP 15678 |
14.91 |
| 2026-07-29 12:00 |
03:21:45.62 |
-19:46:40.5 |
HIP 15678 |
16.46 |
| 2026-07-30 00:00 |
03:21:46.31 |
-19:45:02.7 |
HIP 15678 |
18.03 |
| 2026-07-30 12:00 |
03:21:46.55 |
-19:43:26.1 |
HIP 15678 |
19.60 |
| 2026-07-31 00:00 |
03:21:46.32 |
-19:41:50.9 |
HIP 15678 |
21.18 |
| 2026-07-31 12:00 |
03:21:45.62 |
-19:40:16.9 |
HIP 15678 |
22.75 |
| 2026-08-01 00:00 |
03:21:44.42 |
-19:38:44.1 |
HIP 15678 |
24.32 |
| 2026-08-01 12:00 |
03:21:42.73 |
-19:37:12.6 |
HIP 15678 |
25.89 |
| 2026-08-02 00:00 |
03:21:40.54 |
-19:35:42.3 |
HIP 15678 |
27.46 |
| 2026-08-02 12:00 |
03:21:37.82 |
-19:34:13.3 |
HIP 15678 |
29.03 |
| 2026-08-03 00:00 |
03:21:34.57 |
-19:32:45.4 |
HIP 15678 |
30.61 |
| 2026-08-03 12:00 |
03:21:30.78 |
-19:31:18.8 |
HIP 15678 |
32.21 |
| 2026-08-04 00:00 |
03:21:26.43 |
-19:29:53.4 |
HIP 15678 |
33.83 |
| 2026-08-04 12:00 |
03:21:21.52 |
-19:28:29.1 |
HIP 15678 |
35.47 |
| 2026-08-05 00:00 |
03:21:16.02 |
-19:27:06.0 |
HIP 15678 |
37.15 |
| 2026-08-05 12:00 |
03:21:09.93 |
-19:25:44.1 |
HIP 15678 |
38.87 |
| 2026-08-06 00:00 |
03:21:03.23 |
-19:24:23.3 |
HIP 15504 |
38.29 |
| 2026-08-06 12:00 |
03:20:55.91 |
-19:23:03.7 |
HIP 15504 |
36.32 |
| 2026-08-07 00:00 |
03:20:47.95 |
-19:21:45.1 |
HIP 15504 |
34.32 |
| 2026-08-07 12:00 |
03:20:39.33 |
-19:20:27.6 |
HIP 15504 |
32.31 |
| 2026-08-08 00:00 |
03:20:30.05 |
-19:19:11.2 |
HIP 15504 |
30.33 |
| 2026-08-08 12:00 |
03:20:20.08 |
-19:17:55.8 |
HIP 15504 |
28.40 |
| 2026-08-09 00:00 |
03:20:09.41 |
-19:16:41.5 |
HIP 15504 |
26.59 |
| 2026-08-09 12:00 |
03:19:58.02 |
-19:15:28.2 |
HIP 15504 |
24.96 |
| 2026-08-10 00:00 |
03:19:45.89 |
-19:14:15.8 |
HIP 15504 |
23.61 |
| 2026-08-10 12:00 |
03:19:33.01 |
-19:13:04.3 |
HIP 15504 |
22.64 |
| 2026-08-11 00:00 |
03:19:19.36 |
-19:11:53.8 |
HIP 15504 |
22.19 |
| 2026-08-11 12:00 |
03:19:04.91 |
-19:10:44.1 |
HIP 15504 |
22.35 |
| 2026-08-12 00:00 |
03:18:49.65 |
-19:09:35.3 |
HIP 15504 |
23.21 |
| 2026-08-12 12:00 |
03:18:33.56 |
-19:08:27.2 |
HIP 15504 |
24.78 |
| 2026-08-13 00:00 |
03:18:16.61 |
-19:07:19.9 |
HIP 15504 |
27.01 |
| 2026-08-13 12:00 |
03:17:58.79 |
-19:06:13.3 |
HIP 15504 |
29.84 |
| 2026-08-14 00:00 |
03:17:40.07 |
-19:05:07.3 |
HIP 15210 |
27.75 |
| 2026-08-14 12:00 |
03:17:20.43 |
-19:04:02.0 |
HIP 15210 |
24.87 |
| 2026-08-15 00:00 |
03:16:59.85 |
-19:02:57.2 |
HIP 15210 |
22.51 |
| 2026-08-15 12:00 |
03:16:38.30 |
-19:01:53.0 |
HIP 15210 |
20.97 |
| 2026-08-16 00:00 |
03:16:15.77 |
-19:00:49.2 |
HIP 15210 |
20.63 |
| 2026-08-16 12:00 |
03:15:52.21 |
-18:59:45.7 |
HIP 15210 |
21.71 |
| 2026-08-17 00:00 |
03:15:27.61 |
-18:58:42.6 |
HIP 15210 |
24.20 |
| 2026-08-17 12:00 |
03:15:01.94 |
-18:57:39.8 |
HIP 15025 |
25.09 |
| 2026-08-18 00:00 |
03:14:35.17 |
-18:56:37.2 |
HIP 15025 |
19.67 |
| 2026-08-18 12:00 |
03:14:07.28 |
-18:55:34.7 |
HIP 15025 |
14.95 |
| 2026-08-19 00:00 |
03:13:38.23 |
-18:54:32.2 |
HIP 15025 |
12.20 |