메타데이터
| 항목 |
값 |
| Designation |
C/2022 D2 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-03-27T13:51:54.040320Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:31Z |
| Obs used |
112 |
| NEO |
- |
| M1 |
14.100 |
| K1 |
25.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-02-25T02:54:45.244800Z |
| Discovery magnitude (MPC) |
19.85 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-03-11.0000000 |
| e |
0.99563301 |
| q (au) |
1.555140 |
| a (au) |
356.112305 |
| i (deg) |
22.654502 |
| Ω (om, deg) |
312.470402 |
| ω (w, deg) |
177.792237 |
| M (ma, deg) |
359.997569 |
밝기
산란 + 전체 선형
$$
M_a = (15.407 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.407 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
17:56:52.01 |
-38:10:07.6 |
HIP 87978 |
16.87 |
| 2026-09-20 12:00 |
17:56:53.36 |
-38:09:30.3 |
HIP 87978 |
16.63 |
| 2026-09-21 00:00 |
17:56:54.80 |
-38:08:53.2 |
HIP 87978 |
16.39 |
| 2026-09-21 12:00 |
17:56:56.33 |
-38:08:16.1 |
HIP 87978 |
16.17 |
| 2026-09-22 00:00 |
17:56:57.95 |
-38:07:39.0 |
HIP 87978 |
15.95 |
| 2026-09-22 12:00 |
17:56:59.65 |
-38:07:02.0 |
HIP 87978 |
15.74 |
| 2026-09-23 00:00 |
17:57:01.45 |
-38:06:25.1 |
HIP 87978 |
15.54 |
| 2026-09-23 12:00 |
17:57:03.34 |
-38:05:48.2 |
HIP 87978 |
15.35 |
| 2026-09-24 00:00 |
17:57:05.31 |
-38:05:11.5 |
HIP 87978 |
15.18 |
| 2026-09-24 12:00 |
17:57:07.37 |
-38:04:34.7 |
HIP 87978 |
15.03 |
| 2026-09-25 00:00 |
17:57:09.52 |
-38:03:58.1 |
HIP 87978 |
14.90 |
| 2026-09-25 12:00 |
17:57:11.76 |
-38:03:21.5 |
HIP 87978 |
14.78 |
| 2026-09-26 00:00 |
17:57:14.09 |
-38:02:45.0 |
HIP 87978 |
14.69 |
| 2026-09-26 12:00 |
17:57:16.50 |
-38:02:08.6 |
HIP 87978 |
14.62 |
| 2026-09-27 00:00 |
17:57:19.00 |
-38:01:32.3 |
HIP 87978 |
14.58 |
| 2026-09-27 12:00 |
17:57:21.59 |
-38:00:56.0 |
HIP 87978 |
14.56 |
| 2026-09-28 00:00 |
17:57:24.27 |
-38:00:19.8 |
HIP 87978 |
14.58 |
| 2026-09-28 12:00 |
17:57:27.03 |
-37:59:43.7 |
HIP 87978 |
14.62 |
| 2026-09-29 00:00 |
17:57:29.87 |
-37:59:07.7 |
HIP 87978 |
14.70 |
| 2026-09-29 12:00 |
17:57:32.81 |
-37:58:31.8 |
HIP 87978 |
14.81 |
| 2026-09-30 00:00 |
17:57:35.82 |
-37:57:55.9 |
HIP 87978 |
14.96 |
| 2026-09-30 12:00 |
17:57:38.93 |
-37:57:20.2 |
HIP 87978 |
15.14 |
| 2026-10-01 00:00 |
17:57:42.11 |
-37:56:44.5 |
HIP 87978 |
15.36 |
| 2026-10-01 12:00 |
17:57:45.39 |
-37:56:09.0 |
HIP 87978 |
15.62 |
| 2026-10-02 00:00 |
17:57:48.74 |
-37:55:33.5 |
HIP 87978 |
15.91 |
| 2026-10-02 12:00 |
17:57:52.18 |
-37:54:58.1 |
HIP 87978 |
16.24 |
| 2026-10-03 00:00 |
17:57:55.71 |
-37:54:22.8 |
HIP 87978 |
16.60 |
| 2026-10-03 12:00 |
17:57:59.32 |
-37:53:47.7 |
HIP 88081 |
16.01 |
| 2026-10-04 00:00 |
17:58:03.01 |
-37:53:12.6 |
HIP 88081 |
15.25 |
| 2026-10-04 12:00 |
17:58:06.79 |
-37:52:37.6 |
HIP 88081 |
14.51 |
| 2026-10-05 00:00 |
17:58:10.64 |
-37:52:02.7 |
HIP 88081 |
13.77 |
| 2026-10-05 12:00 |
17:58:14.58 |
-37:51:27.9 |
HIP 88081 |
13.05 |
| 2026-10-06 00:00 |
17:58:18.61 |
-37:50:53.3 |
HIP 88081 |
12.34 |
| 2026-10-06 12:00 |
17:58:22.71 |
-37:50:18.7 |
HIP 88081 |
11.65 |
| 2026-10-07 00:00 |
17:58:26.90 |
-37:49:44.3 |
HIP 88081 |
11.00 |
| 2026-10-07 12:00 |
17:58:31.17 |
-37:49:09.9 |
HIP 88081 |
10.39 |
| 2026-10-08 00:00 |
17:58:35.52 |
-37:48:35.7 |
HIP 88081 |
9.82 |
| 2026-10-08 12:00 |
17:58:39.95 |
-37:48:01.6 |
HIP 88081 |
9.33 |
| 2026-10-09 00:00 |
17:58:44.46 |
-37:47:27.6 |
HIP 88081 |
8.91 |
| 2026-10-09 12:00 |
17:58:49.04 |
-37:46:53.7 |
HIP 88081 |
8.60 |
| 2026-10-10 00:00 |
17:58:53.71 |
-37:46:19.9 |
HIP 88081 |
8.39 |
| 2026-10-10 12:00 |
17:58:58.46 |
-37:45:46.3 |
HIP 88081 |
8.31 |
| 2026-10-11 00:00 |
17:59:03.29 |
-37:45:12.7 |
HIP 88081 |
8.37 |