메타데이터
| 항목 |
값 |
| Designation |
489P/Denning |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-04-20T21:15:31.694400Z |
| Orbit solution date (soln_date, UTC) |
2024-10-11T13:45:58Z |
| Obs used |
302 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
49.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2007-04-17T03:02:00.096000Z |
| Discovery magnitude (MPC) |
18.70 |
| Discovery observatory (MPC) |
704 · Lincoln Laboratory ETS, New Mexico |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2002-08-18.0000000 |
| e |
0.64560760 |
| q (au) |
1.574689 |
| a (au) |
4.443348 |
| i (deg) |
4.007070 |
| Ω (om, deg) |
22.578905 |
| ω (w, deg) |
107.960844 |
| M (ma, deg) |
180.384811 |
밝기
산란 + 전체 선형
$$
M_a = (13.591 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.591 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
14:48:28.22 |
-18:19:38.3 |
HIP 72319 |
18.45 |
| 2026-09-25 12:00 |
14:49:08.40 |
-18:22:40.1 |
HIP 72319 |
26.18 |
| 2026-09-26 00:00 |
14:49:48.60 |
-18:25:41.5 |
HIP 72702 |
29.44 |
| 2026-09-26 12:00 |
14:50:28.83 |
-18:28:42.4 |
HIP 72702 |
20.91 |
| 2026-09-27 00:00 |
14:51:09.08 |
-18:31:42.9 |
HIP 72702 |
14.44 |
| 2026-09-27 12:00 |
14:51:49.37 |
-18:34:43.0 |
HIP 72702 |
13.41 |
| 2026-09-28 00:00 |
14:52:29.68 |
-18:37:42.6 |
HIP 72702 |
18.75 |
| 2026-09-28 12:00 |
14:53:10.01 |
-18:40:41.8 |
HIP 72876 |
21.44 |
| 2026-09-29 00:00 |
14:53:50.37 |
-18:43:40.5 |
HIP 72876 |
23.08 |
| 2026-09-29 12:00 |
14:54:30.76 |
-18:46:38.8 |
HIP 72865 |
25.64 |
| 2026-09-30 00:00 |
14:55:11.17 |
-18:49:36.7 |
HIP 73096 |
17.24 |
| 2026-09-30 12:00 |
14:55:51.61 |
-18:52:34.0 |
HIP 73096 |
7.27 |
| 2026-10-01 00:00 |
14:56:32.07 |
-18:55:31.0 |
HIP 73096 |
3.01 |
| 2026-10-01 12:00 |
14:57:12.55 |
-18:58:27.4 |
HIP 73096 |
12.87 |
| 2026-10-02 00:00 |
14:57:53.06 |
-19:01:23.4 |
HIP 73096 |
22.87 |
| 2026-10-02 12:00 |
14:58:33.60 |
-19:04:19.0 |
HIP 73096 |
32.88 |
| 2026-10-03 00:00 |
14:59:14.15 |
-19:07:14.1 |
HIP 73370 |
31.70 |
| 2026-10-03 12:00 |
14:59:54.74 |
-19:10:08.7 |
HIP 73370 |
28.54 |
| 2026-10-04 00:00 |
15:00:35.34 |
-19:13:02.8 |
HIP 73514 |
28.11 |
| 2026-10-04 12:00 |
15:01:15.97 |
-19:15:56.5 |
HIP 73514 |
27.97 |
| 2026-10-05 00:00 |
15:01:56.62 |
-19:18:49.7 |
HIP 73514 |
31.23 |
| 2026-10-05 12:00 |
15:02:37.29 |
-19:21:42.4 |
HIP 73514 |
36.99 |
| 2026-10-06 00:00 |
15:03:17.99 |
-19:24:34.6 |
HIP 73822 |
30.47 |
| 2026-10-06 12:00 |
15:03:58.70 |
-19:27:26.3 |
HIP 73822 |
20.54 |
| 2026-10-07 00:00 |
15:04:39.44 |
-19:30:17.5 |
HIP 73822 |
10.76 |
| 2026-10-07 12:00 |
15:05:20.19 |
-19:33:08.3 |
HIP 73822 |
3.21 |
| 2026-10-08 00:00 |
15:06:00.97 |
-19:35:58.5 |
HIP 73822 |
10.27 |
| 2026-10-08 12:00 |
15:06:41.77 |
-19:38:48.3 |
HIP 73904 |
17.36 |
| 2026-10-09 00:00 |
15:07:22.58 |
-19:41:37.5 |
HIP 73904 |
24.81 |
| 2026-10-09 12:00 |
15:08:03.42 |
-19:44:26.3 |
HIP 74174 |
22.46 |
| 2026-10-10 00:00 |
15:08:44.27 |
-19:47:14.5 |
HIP 74174 |
13.49 |
| 2026-10-10 12:00 |
15:09:25.14 |
-19:50:02.2 |
HIP 74174 |
7.74 |
| 2026-10-11 00:00 |
15:10:06.02 |
-19:52:49.4 |
HIP 74174 |
11.76 |
| 2026-10-11 12:00 |
15:10:46.93 |
-19:55:36.1 |
HIP 74174 |
20.42 |
| 2026-10-12 00:00 |
15:11:27.84 |
-19:58:22.3 |
HIP 74392 |
15.25 |
| 2026-10-12 12:00 |
15:12:08.78 |
-20:01:07.9 |
HIP 74392 |
13.67 |
| 2026-10-13 00:00 |
15:12:49.73 |
-20:03:53.0 |
HIP 74492 |
13.12 |
| 2026-10-13 12:00 |
15:13:30.69 |
-20:06:37.5 |
HIP 74492 |
9.16 |
| 2026-10-14 00:00 |
15:14:11.66 |
-20:09:21.5 |
HIP 74492 |
13.98 |
| 2026-10-14 12:00 |
15:14:52.65 |
-20:12:05.0 |
HIP 74667 |
8.83 |
| 2026-10-15 00:00 |
15:15:33.65 |
-20:14:48.0 |
HIP 74667 |
2.00 |
| 2026-10-15 12:00 |
15:16:14.67 |
-20:17:30.4 |
HIP 74667 |
11.39 |
| 2026-10-16 00:00 |
15:16:55.69 |
-20:20:12.2 |
HIP 74760 |
20.27 |